NEUTRON-DIFFRACTION STUDY ON STRUCTURAL AND MAGNETIC-PROPERTIES OF LA2NIO4

被引：459

作者：

RODRIGUEZCARVAJAL, J

FERNANDEZDIAZ, MT

MARTINEZ, JL

机构：

[1] Inst. Laue-Langevin, Grenoble

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1991年 / 3卷 / 19期

关键词：

D O I：

10.1088/0953-8984/3/19/002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

An overall survey of the structural and magnetic features of the La2NiO4-sigma system is presented as a result of neutron diffraction experiments. The stoichiometric compound (delta = 0) presents two structural phase transitions. At T0 congruent-to 770 K. La2NiO4 transforms from tetragonal (I4/mmm) to orthorhombic (Bmab); at T1 congruent-to 80 K, from orthorhombic to a new tetragonal (P4(2)/ncm) phase. Associated with this second phase transition a strong microstrain produces anisotropic broadening of Bragg reflections. La2NiO4 is three-dimensional (3D) antiferromagnetically ordered at room temperature (T(N) = 330 K). A weak ferromagnetic component appears below T1. Oxygen excess suppress the 3D magnetic ordering and the structural phase transformations, giving rise to a non-stoichiometric compound with interstitial oxygens. A tentative phase diagram is proposed.

引用

页码：3215 / 3234

页数：20

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