Crystal structure, electrical conductivity and thermal expansion of Ni and Nb co-doped LaCoO3
Abstract
The effect of co-doping LaCoO3 with Ni and Nb has been investigated in the two solid solution series (1 − x)LaCoO3–xLaNi2/3Nb1/3O3 and (1 − y)LaCo2/3Ni1/3O3–yLaNi2/3Nb1/3O3. The materials were shown to be stoichiometric with respect to oxygen. The compositional effect on the evolution of the crystal structure, thermal expansion and electrical conductivity is reported. The chemical stability of LaCoO3 in a reducing atmosphere was improved and the thermal expansion was suppressed at higher levels of Nb-substitution. The materials with mixed