Investigation of the La_(1-x)(Ca or Sr)_xCrO3(x=0 and 0.25)Interconnect Materials for High Temperature Electrolysis of Steam

摘要

The La_(1-x)(Ca or Sr)_xCrO3(x=0 and 0.25)interconnect materials for high temperature electrolysis of steam were investigated in views of sinterability and electrical conductivity.LaCrO3,La_(0.75)Ca_(0.25)CrO3(LCC),and La_(0.75)Sr_(0.25)CrO3(LSC)powders were synthesized by coprecipitation method.Crystal structure was confirmed by X-ray diffraction(XRD).The sintering characteristics were analyzed by relative density and scanning electron microscopy.The electrical conductivity was measured by a DC four probe method.From the analyses of relative densities,it was found that the doped LaCrO3 showed better sinterability than LaCrO3 and the those sinterability increased with decrease of those particle sizes.The XRD results at different sintering temperatures for LCC and LSC revealed that the sinterability is closely related to the second phase transformation,that is,the second phase melting above 1,300 °C for LCC and 1,400 °C for LSC significantly promotes the sinterability.In case of electrical conductivities of LCC and LSC,which had a similar relative density,LCC showed better electrical conductivity than LSC.