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Title

Phase-pure BiFeO3 produced by reaction flash-sintering of Bi2O3 and Fe2O3

AuthorsGil-González, Eva; Perejón, Antonio ; Sánchez-Jiménez, P.E. ; Sayagués, María Jesús ; Raj, Rishi; Pérez-Maqueda, Luis A.
Issue Date2018
CitationJournal of Materials Chemistry A 6: 5356- 5366 (2018)
AbstractMixed powders of BiO and FeO are shown to yield single-phase, dense nanostructured polycrystals of BiFeO in reaction flash sintering experiments, carried out by applying a field of 50 V cm and with the current limit set to 35 mA mm. The furnace was heated at a constant rate with the reaction sintering taking place abruptly upon reaching 625 °C. Remarkably, an intermediate bismuth-rich phase of the oxide that forms just before reaching the flash temperature transforms, and at the same time sinters, into single-phase BiFeO within a few seconds after the onset of the flash. The BiFeO so produced is electrically insulating, a property that is critical to its applications. This one-step synthesis of single-phase polycrystals of complex oxides from their basic constituents, by reaction flash sintering, is a significant development in the processing of complex oxides, which are normally difficult to sinter by conventional methods.
URIhttp://hdl.handle.net/10261/171921
Identifiersdoi: 10.1039/c7ta09239c
issn: 2050-7496
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