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Control of experimental conditions in reaction flash-sintering of complex stoichiometry ceramics

2020; Elsevier BV; Volume: 46; Issue: 18 Linguagem: Inglês

10.1016/j.ceramint.2020.05.091

1873-3956

Eva Gil‐González, Antonio Perejón, Pedro E. Sánchez‐Jiménez, Daniel Román-González, Luis A. Pérez‐Maqueda,

Microwave Dielectric Ceramics Synthesis

The inherent potential of reaction flash-sintering for the preparation of complex oxides is evidenced by the one-step synthesis and densification of a ceramic of complex stoichiometry. The system Bi0.93La0.07FeO3, a multiferroic ceramic with promising technological applications, has been chosen. This system presents three different metals in its composition and it is extremely challenging to prepare by conventional procedures. Non-stoichiometric materials with unwilling secondary phases are usually obtained by conventional methods, due to the high volatility of bismuth oxide at the temperatures required for inducing the solid-solid reactions. Here, it is demonstrated that a careful control of the experimental flash conditions (applied electric field and selected current density limit) is required to obtain a high quality ceramic. Small deviations from the optimum conditions result in either non-stoichometric or poorly densified samples.