Electric field-assisted pressureless sintering gadolinium-, yttrium- and samarium-doped barium cerate
Abstract: Gadolinium-, yttrium- and samarium-doped barium cerate compounds were sintered either conventionally at 1500 degrees C or applying an electric field at 1200 degrees C. The combined results of dilatometry and impedance spectroscopy measurements in electric field-assisted sintered specimens show substantial improvement of the electrical conductivity. Improved grain-to-grain contact and the thermal removal of depleted chemical species due to Joule heating at the space charge region are proposed as the main mechanisms for the increase of both the grain boundary and the bulk electrical conductivities, respectively. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Author(s): Muccillo, R; Esposito, V; de Florio, DZ; Muccillo, ENS
SCRIPTA MATERIALIA
Volume: 156 Pages: 6-9 Published: NOV 2018
DOI: 10.1016/j.scriptamat.2018.07.005
