The β-to-γ Transition in BiFeO3: A Powder Neutron Diffraction Study

被引：79

作者：

Arnold, Donna C. ^{[1
]}

Knight, Kevin S. ^{[2
]}

Catalan, Gustau ^{[3
]}

Redfern, Simon A. T. ^{[3
]}

Scott, James F. ^{[3
]}

Lightfoot, Philip ^{[1
]}

Morrison, Finlay D. ^{[1
]}

机构：

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

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

[3] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

来源：

ADVANCED FUNCTIONAL MATERIALS | 2010年 / 20卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

PHASE-TRANSITIONS; MAGNETIC-PROPERTIES; MULTIFERROICS; TEMPERATURE; PEROVSKITES; STABILITY;

D O I：

10.1002/adfm.201000118

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

High-temperature powder neutron diffraction experiments are conducted around the reported beta-gamma phase transition (similar to 930 degrees C) in BiFeO3. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the beta- and gamma-phase of BiFeO3 exhibit orthorhombic symmetry; i.e., no further increase of symmetry occurs during this transition. The gamma-orthorhombic phase is observed to persist up to a temperature of approximately 950 degrees C before complete decomposition into Bi2Fe4O9 (and liquid Bi2O3), which subsequently begins to decompose at approximately 960 degrees C.

引用

页码：2116 / 2123

页数：8

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