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

 

Ceramics International

Volume 46, Issue 18, Part B, 15 December 2020, Pages 29413-29420

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

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

a
    John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, United States

b
    Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas−Universidad de Sevilla, Calle Américo Vespucio 49, Sevilla, 41092, Spain

c
    Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Sevilla, Spain

Received 20 January 2020, Revised 7 May 2020, Accepted 8 May 2020, Available online 23 May 2020, Version of Record 24 October 2020.

 

 

Abstract

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 Bi_0.93La_0.07FeO₃, 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.

 

 https://www.sciencedirect.com/science/article/pii/S0272884220313791