Hyperfine interactions in the perovskites SrHfO3 and BaHfO3

P. DE LA PRESA; R. E. ALONSO; A.P. AYALA; V.V. KRISHNAMURTI; K.P. LIEB; A. LÓPEZ GARCÍA; M. NEUBAUER; M. UHRMACHER

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS

Año: 1999 vol. 60 p. 749 - 757

0022-3697

Abstract The electric field gradients in perovskite SrHfO3 and BaHfO3 powder samples were investigated by means of Perturbed Angular Correlation spectroscopy, using implanted 111In hyperfine probes. The measurements cover the temperature ranges from 22 to 893 K for SrHfO3 and from 293 to 875 K for BaHfO3, respectively. In both compounds, three quadrupole interactions were established. The largest fraction showing a pronounced dynamic interaction is assigned to 111In/111Cd probe atoms on substitutional Hf sites in both compounds. For SrHfO3, the temperature dependence of the dynamic interaction was associated to the Pnma $ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for3 and BaHfO3 powder samples were investigated by means of Perturbed Angular Correlation spectroscopy, using implanted 111In hyperfine probes. The measurements cover the temperature ranges from 22 to 893 K for SrHfO3 and from 293 to 875 K for BaHfO3, respectively. In both compounds, three quadrupole interactions were established. The largest fraction showing a pronounced dynamic interaction is assigned to 111In/111Cd probe atoms on substitutional Hf sites in both compounds. For SrHfO3, the temperature dependence of the dynamic interaction was associated to the Pnma $ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for111In hyperfine probes. The measurements cover the temperature ranges from 22 to 893 K for SrHfO3 and from 293 to 875 K for BaHfO3, respectively. In both compounds, three quadrupole interactions were established. The largest fraction showing a pronounced dynamic interaction is assigned to 111In/111Cd probe atoms on substitutional Hf sites in both compounds. For SrHfO3, the temperature dependence of the dynamic interaction was associated to the Pnma $ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for3 and from 293 to 875 K for BaHfO3, respectively. In both compounds, three quadrupole interactions were established. The largest fraction showing a pronounced dynamic interaction is assigned to 111In/111Cd probe atoms on substitutional Hf sites in both compounds. For SrHfO3, the temperature dependence of the dynamic interaction was associated to the Pnma $ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for111In/111Cd probe atoms on substitutional Hf sites in both compounds. For SrHfO3, the temperature dependence of the dynamic interaction was associated to the Pnma $ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for3, the temperature dependence of the dynamic interaction was associated to the Pnma $ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for$ Imma phase transition for SrHfO3 at about 700 K. We discuss the results in relation to those obtained for 111In/111Cd-probes in PbZrO3 and BaTiO3, and for 181Hf/181Ta-probes in AHfO3 (A . Ca, Sr, Ba). q1999 Elsevier Science Ltd. All rights reserved.In/111Cd-probes in PbZrO3 and BaTiO3, and for 181Hf/181Ta-probes in AHfO3 (A . Ca, Sr, Ba). q1999 Elsevier Science Ltd. All rights reserved. Keywords: Perturbed angular correlation spectroscopyPerturbed angular correlation spectroscopy