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

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Abstract

Mixed powders of Bi2O3 and Fe2O3 are shown to yield single-phase, dense nanostructured polycrystals of BiFeO3 in reaction flash sintering experiments, carried out by applying a field of 50 V cm−1 and with the current limit set to 35 mA mm−2. 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 BiFeO3 within a few seconds after the onset of the flash. The BiFeO3 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.

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

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Publication details

The article was received on 20 Oct 2017, accepted on 22 Dec 2017 and first published on 22 Dec 2017


Article type: Paper
DOI: 10.1039/C7TA09239C
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Phase-pure BiFeO3 produced by reaction flash-sintering of Bi2O3 and Fe2O3

    E. Gil-González, A. Perejón, P. E. Sánchez-Jiménez, M. J. Sayagués, R. Raj and L. A. Pérez-Maqueda, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA09239C

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