NEUTRON-SCATTERING INVESTIGATION OF THE HIGH-TEMPERATURE PHASE-TRANSITION IN NITIO3

被引：38

作者：

LERCH, M ^{[1
]}

BOYSEN, H ^{[1
]}

NEDER, R ^{[1
]}

FREY, F ^{[1
]}

LAQUA, W ^{[1
]}

机构：

[1] UNIV MUNICH,INST KRISTALLOG & MINERAL,W-8000 MUNICH 2,GERMANY

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1992年 / 53卷 / 09期

关键词：

NITIO3; ILMENITE STRUCTURE; PHASE TRANSITION; NEUTRON DIFFRACTION; CATION DISTRIBUTION;

D O I：

10.1016/0022-3697(92)90032-9

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nickel titanate, NiTiO3, undergoes a second order phase transition at T(c) = 1570(10) K from the ilmenite structure with space group R3BAR to the corundum structure with space group R3cBAR. It is predominantly due to a Ni/Ti order-disorder transition. The temperature dependence of certain superstructure reflexions, investigated by powder neutron diffraction suggests, however, a coupling to other displacive degrees of freedom of the order parameter. The behaviour of the essential part of the order parameter below the critical region may be described by the law of mass action applied to the exchange of Ni and Ti on nonequivalent sites.

引用

页码：1153 / 1156

页数：4

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