Ferroelectric-Paraelectric Transition in BiFeO3: Crystal Structure of the Orthorhombic β Phase

被引：277

作者：

Arnold, Donna C. ^{[1
]}

Knight, Kevin S. ^{[2
]}

Morrison, Finlay D. ^{[1
]}

Lightfoot, Philip ^{[1
]}

机构：

[1] Univ St Andrews, Sch Chem, St Andrews KY16 9ST, Fife, Scotland

[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

POLYCRYSTALLINE BIFEO3; NEUTRON-DIFFRACTION; MAGNETIC-PROPERTIES; TEMPERATURE; MULTIFERROICS;

D O I：

10.1103/PhysRevLett.102.027602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A detailed investigation using variable temperature powder neutron diffraction demonstrates that BiFeO3 undergoes a phase transition from the ferroelectric alpha phase (rhombohedral, R3c) to a paraelectric beta phase (orthorhombic, Pbnm) between 820 degrees C and 830 degrees C. Coexistence of both phases over a finite temperature interval, together with abrupt changes in key structural parameters, confirms that the transition is first order. The beta phase corresponds to a GdFeO3-type perovskite structure.

引用

页数：4

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