Phase formation, microstructure, and ionic conductivity of (La,Sr)(Ga,Ge,Mg)O3–d ceramics

Abstract

We have prepared ceramic (La_0.8Sr_0.2){[Ga_0.8–x(Ge_0.5Mg_0.5)_x]Mg_0.2}O_3–d (LSGGM) (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8) samples by solid-state reactions and studied their phase composition, structure, microstructure, and electrical conductivity. Phase-pure solid solutions have been obtained upon substitution of germanium and magnesium cations for up to 20 at % of the gallium cations. The modified samples have been shown to have high density, optimal microstructure, densely packed grains, and high electrical conductivity at high temperatures.