Anisotropic lattice expansion determined during flash sintering of BiFeO3 by in-situ energy-dispersive X-ray diffraction

BiFeO3 has a Curie temperature (TC) of 825 °C, making it difficult to sinter with conventional methods while maintaining the purity of the material, as unavoidably secondary phases appear at temperatures above Tc. Flash sintering is a relatively new technique that saves time and energy compared to o...

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Bibliographic Details
Published in:Scripta materialia 2018-11, Vol.162 (C)
Main Authors: Wassel, Mary Anne B., Pérez-Maqueda, Luis A., Gil-Gonzalez, Eva, Charalambous, Harry, Perejon, Antonio, Jha, Shikhar K., Okasinski, John, Tsakalakos, Thomas
Format: Article
Language:English
Subjects:
BiFeO3
Energy dispersive X-ray diffraction
MATERIALS SCIENCE
Nanocrystalline materials
Sintering
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Summary:BiFeO3 has a Curie temperature (TC) of 825 °C, making it difficult to sinter with conventional methods while maintaining the purity of the material, as unavoidably secondary phases appear at temperatures above Tc. Flash sintering is a relatively new technique that saves time and energy compared to other sintering methods. BiFeO3 was flash sintered at 500 °C to achieve 90% densification. In-situ energy dispersive X-ray diffraction (EDXRD) reflected that the material did not undergo any phase transformation, having been sintered well below the TC. Interestingly, anisotropic lattice expansion in the materialwas observed when the sample was exposed to the electric field.
ISSN:1359-6462
1872-8456