Ultrafast high-temperature sintering (UHS) of cerium oxide-based compound

Ultrafast high-temperature sintering (UHS) is an innovative sintering technique that can densify ceramics in a few seconds, dramatically reducing the carbon footprint and firing costs. In this work, the feasibility of applying UHS in Gd-doped ceria (GDC) and GDC-Er-stabilized bismuth oxide (ESB) composite powders was investigated. At high UHS currents (22-24 A), fully dense GDC samples with a large grain size were obtained. Nonetheless, most of the GDC pellets exhibited micro/macro cracks, which were reduced by lowering the sample thickness. Interestingly, the GDC-ESB composite samples exhibit no cracks or fragmentation at all, thanks to ESB as a sintering aid. Thie samples were further characterized from an electrochemical and electromechanical point of view. The GDC-ESB material displays an ionic conductivity value of similar to 1.5 x 10(-2) S/cm at 600 degrees C and frequency-stable (0.1-350 Hz) room temperature electrostriction strain coefficient of similar to 10(-18) (m/V)(2).