On the Thermodynamic Stability of BiFeO3

The thermodynamic stability of BiFeO3 is investigated by high temperature X-ray diffraction and isothermal heat treatment of Bi2O3−Fe2O3 powder mixture as well as phase pure BiFeO3 prepared by a wet chemical route. Experimental evidence for decomposition of BiFeO3 to Bi25FeO39 and Bi2Fe4O9 in the te...

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Bibliographic Details
Published in:Chemistry of materials 2009-01, Vol.21 (1), p.169-173
Main Authors: Selbach, Sverre M, Einarsrud, Mari-Ann, Grande, Tor
Format: Article
Language:English
Subjects:
Electronic Materials
Inorganic Solids and Ceramics
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Summary:The thermodynamic stability of BiFeO3 is investigated by high temperature X-ray diffraction and isothermal heat treatment of Bi2O3−Fe2O3 powder mixture as well as phase pure BiFeO3 prepared by a wet chemical route. Experimental evidence for decomposition of BiFeO3 to Bi25FeO39 and Bi2Fe4O9 in the temperature interval 720−1040 K is reported. The experimental observations are discussed in terms of available thermodynamic data for the system. Finally, the stability of BiFeO3 and related Bi-based perovskites is discussed in relation to Goldschmidt tolerance factor and the influence of pressure and chemical substitution.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm802607p