Abstract
La0.68Ca0.32Cr0.97O3 separator films were prepared under various sintering conditions. Their bending strength, relative density, electrical conductivity and sintering behavior were investigated by a 4-point bending apparatus, X-ray diffraction (XRD), four terminal method, scanning electron microscooy (SEM) and energy dispersive X-ray spectroscopy (EDX). The bending strength of La0.68Ca0.32Cr0.97O3 at room temperature increased with the increase of sintering temperature and time. A relative density of more than 94% was obtained by sintering at 1673 K for 5 hours. Thus the present investigation revealed that the sintering of La0 68Ca0.32Cr0.97O3 at low temperatures was greatly assisted by the formation of Caa(CrO4)b. Caa(CrO4)b, and incongruently melts and reacts with La1-xCaxCrO3-δ, which enhanced mass transport and resulted in rapid grain growth and densification of the films. Also, the electrical conductivity of La0.68Ca0.32Cr0.97O3 at 1273 K was more than 100 S/cm after heating at 1673 K for 7 hrs.
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