Issue 13, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
20 Oct 2017
Accepted
22 Dec 2017
First published
22 Dec 2017

J. Mater. Chem. A, 2018,6, 5356-5366

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, 6, 5356 DOI: 10.1039/C7TA09239C

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