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

SCRIPTA MATERIALIA

卷:162

Article

Wassel, Mary Anne B.¹  Perez-Maqueda, Luis A.²  Gil-Gonzalez, Eva^2,3  Charalambous, Harry¹  Perejon, Antonio^2,4  Jha, Shikhar K.¹  Okasinski, John⁵  Tsakalakos, Thomas¹ 

[1] Rutgers State Univ, Dept Mat Sci & Engn, 607 Taylor Rd, Piscataway, NJ 08854 USA

[2] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, Calle Americo Vespucio 49, Seville 41092, Spain

[3] Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[4] Univ Seville, Fac Quim, Dept Quim Inorgan, E-41071 Seville, Spain

[5] Argonne Natl Lab, Xray Sci Div, Adv Photon Source, Argonne, IL 60439 USA

关键词: Sintering;    Energy dispersive X-ray diffraction;    BiFeO3;    Nanocrystalline materials;   

DOI  :  10.1016/j.scriptamat.2018.11.028

来源: Elsevier

【 摘 要 】

BiFeO3 has a Curie temperature (T-c) of 825 degrees C, making it difficult to sinter using conventional methods while maintaining the purity of the material, as unavoidably secondary phases appear at temperatures above T-c Flash sintering is a relatively new technique that saves time and energy compared to other sintering methods. BiFeO3 was flash sintered at 500 degrees C to achieve 90% densification. In-situ energy dispersive X-ray diffraction (EDXRD) revealed that the material did not undergo any phase transformation, having been sintered well below the Tc. Interestingly, anisotropic lattice expansion in the material was observed when the sample was exposed to the electric field. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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