Superior Oxygen Ion Conductivity of Lanthanum Gallate Doped with Strontium and Magnesium

The solid solution range of the La(Sr)Ga(Mg)O3 perovskite was investigated and the oxygen ion conductivities of corresponding compositions were measured. The solubility of strontium could be extended by the addition of magnesium ions to establish a balance in the oxygen vacancies associated with A and B sites. In this way, the Sr limit in the solid solution was increased to more than 20% of the La content. Doping with either Sr or Mg enhanced …