Preparation, crystal structure and magnetic behavior of new double perovskites Sr2B’UO6 with B’ = Mn, Fe, Ni, Zn

R. M. PINACCA; M. C. VIOLA; J. C. PEDREGOSA; M. J. MARTÍNEZ-LOPE; R. E. CARBONIO; J. A. ALONSO

JOURNAL OF SOLID STATE CHEMISTRY

Elsevier

Año: 2007 vol. 180 p. 1582 - 1589

0022-4596

Sr2B0UO6 double perovskites with B0 ¼ Mn, Fe, Ni, Zn have been prepared in polycrystalline form by solid-state reaction, in air or reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6 2B0UO6 double perovskites with B0 ¼ Mn, Fe, Ni, Zn have been prepared in polycrystalline form by solid-state reaction, in air or reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B0O6 and UO6P21/n), and contains alternating B0O6 and UO6 octahedra sharing corners, tilted along the three pseudocubic axes according to the Glazer notation aab+. The magnetic measurements show a spontaneous magnetic ordering below TN ¼ 21K for B0 ¼ Mn, Ni, and TC ¼ 150K for B0 ¼ Fe. From a Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation measurements show a spontaneous magnetic ordering below TN ¼ 21K for B0 ¼ Mn, Ni, and TC ¼ 150K for B0 ¼ Fe. From a Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation measurements show a spontaneous magnetic ordering below TN ¼ 21K for B0 ¼ Mn, Ni, and TC ¼ 150K for B0 ¼ Fe. From a Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation measurements show a spontaneous magnetic ordering below TN ¼ 21K for B0 ¼ Mn, Ni, and TC ¼ 150K for B0 ¼ Fe. From a Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation Curie–Weiss fit, the effective paramagnetic moment for B0 ¼ Mn (5.74 mB/f.u.) and B0 ¼ Ni(3.51 mB/f.u.) are significantly different from the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge disproportionation the corresponding spin-only moments for the divalent cations, suggesting the possibility of a partial charge d