Discontinuous evolution of the highly distorted orthorhombic structure and the magnetic order in LaMnO3±d perovskite

F. PRADO; R.D. SANCHEZ; A. CANEIRO; M.T. CAUSA; M. TOVAR

JOURNAL OF SOLID STATE CHEMISTRY

Elsevier

Año: 1999 vol. 146 p. 418 - 427

0022-4596

In this work we present a systematic study of the crystallographic structure and the magnetic ordering of LaMnO36d perovskites. Changing the oxygen composition within the range 2.995 < 36d < 3.140, we found a 31d1 value (3.04 < 31d1 < Changing the oxygen composition within the range 2.995 < 36d < 3.140, we found a 31d1 value (3.04 < 31d1 < 36d perovskites. Changing the oxygen composition within the range 2.995 < 36d < 3.140, we found a 31d1 value (3.04 < 31d1 << 36d < 3.140, we found a 31d1 value (3.04 < 31d1 < 3.05) which de5nes a boundary in the magnetic phase diagram5nes a boundary in the magnetic phase diagram T vs 36d. For 31d < 31d1 , antiferromagnetic order is present in the samples with a small ferromagnetic component, while for large 31d values (31d > 31d1) the samples are ferromagnetic. The transition from one region to the other is associated with a change in volume of around 1%. The transition from one region to the other is associated with a change in volume of around 1%. in the samples with a small ferromagnetic component, while for large 31d values (31d > 31d1) the samples are ferromagnetic. The transition from one region to the other is associated with a change in volume of around 1%. The transition from one region to the other is associated with a change in volume of around 1%. vs 36d. For 31d < 31d1 , antiferromagnetic order is present in the samples with a small ferromagnetic component, while for large 31d values (31d > 31d1) the samples are ferromagnetic. The transition from one region to the other is associated with a change in volume of around 1%. The transition from one region to the other is associated with a change in volume of around 1%. 1d values (31d > 31d1) the samples are ferromagnetic. The transition from one region to the other is associated with a change in volume of around 1%.%.