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Stoichiometric Ratio on Phase Transformation in Reaction Sintering of BiFeO3 Ceramics Study: a High Temperature X-ray Diffraction Study
Cheng Guo-Feng; Ruan Yin-Jie; Sun Yue; Yin Han-Di; Xie Qi-Yun
2019-09-23
Source PublicationJOURNAL OF INORGANIC MATERIALS
ISSN1000-324X
Volume34Issue:10Pages:1035
SubtypeArticle
AbstractThe existence of impuritiy phases such as Bi25FeO39 and Bi2Fe4O9 has led to high leakage current in BiFeO3 multiferric materials, which consequently restricts further understanding of its coupling between magnetic and polarization orders. Prior to the attempts to synthesize pure-phase BiFeO3 ceramics, the phase transition involved in the reaction sintering should be clarified. In the present, the phase transformations during the reaction sintering process of BiFeO3 ceramics with different molar ratio of Bi2O3/Fe2O3 in air were studied via High Temperature X-ray Diffraction technique (HT-XRD), Rietveld refinement quantification, and High Temperature Raman Spectroscopy (HT-Raman). The thermal stabilities of BiFeO3, Bi25FeO39 and Bi2Fe4O9 ceramics were also studied by such methods. The qualitative phase distributions after heating were analyzed by Electron Backscattered Diffraction (EBSD). Results show that the phase transition from monoclinic to cubic for Bi2O3 was well done, which usually taken place at 700 degrees C. The Fe2O3 did not react with Bi2O3 to form BiFeO3 until that transition finished. In addition, BiFeO3, Bi25FeO39 and Bi2Fe4O9 phases are not in thermodynamic stable state during the cooling process for Bi excess samples. Bi2O3 excess can effectively inhibit the formation of impurities and promote the sintering of BiFeO3 phase. The phase content of BiFeO3 mainly depends on the molar ratio of Bi2O3/Fe2O3, and 1.03 : 1 is optimum. Combining with our previous research results, it is found that the effective parameters for the synthesis of BiFeO3 strongly depend on the excessive Bi and rapid heating and cooling rate. This work may provide useful experimental guidance for the preparation of pure-phase BiFeO3 ceramics.
KeywordBiFeO3 molar ratio of Bi2O3/Fe2O3 reaction sintering phase transition High Temperature X-ray Diffraction
DOI10.15541/jim20190024
Language中文
WOS Research AreaMaterials Science
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/26819
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Cheng Guo-Feng,Ruan Yin-Jie,Sun Yue,et al. Stoichiometric Ratio on Phase Transformation in Reaction Sintering of BiFeO3 Ceramics Study: a High Temperature X-ray Diffraction Study[J]. JOURNAL OF INORGANIC MATERIALS,2019,34(10):1035.
APA Cheng Guo-Feng,Ruan Yin-Jie,Sun Yue,Yin Han-Di,&Xie Qi-Yun.(2019).Stoichiometric Ratio on Phase Transformation in Reaction Sintering of BiFeO3 Ceramics Study: a High Temperature X-ray Diffraction Study.JOURNAL OF INORGANIC MATERIALS,34(10),1035.
MLA Cheng Guo-Feng,et al."Stoichiometric Ratio on Phase Transformation in Reaction Sintering of BiFeO3 Ceramics Study: a High Temperature X-ray Diffraction Study".JOURNAL OF INORGANIC MATERIALS 34.10(2019):1035.
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