Anisotropic lattice expansion determined during flash sintering of BiFeO3 by in-situ energy-dispersive X-ray diffraction. (15th March 2019)

• Record Type: Journal Article
• Authors: Wassel, Mary Anne B.; Pérez-Maqueda, Luis A.; Gil-Gonzalez, Eva; Charalambous, Harry; Perejon, Antonio; Jha, Shikhar K.; Okasinski, John; Tsakalakos, Thomas
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 286
• Page End: 291
• Publication Date: 2019-03-15
• Subjects: Sintering -- Energy dispersive X-ray diffraction -- BiFeO3 -- Nanocrystalline materials; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.028
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: BiFeO3 has a Curie temperature (TC ) of 825 °C, making it difficult to sinter using 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) 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. Graphical abstract: Unlabelled Image