Phase Formation, Structure, and Electrical Conductivity of Modified Lanthanum-Gallate Ceramics

Resumo

The solid-phase synthesis method is used to prepare perovskite-like ceramic samples with the compositions (La_0.8Sr_0.2){[Ga_0.8–x(Si_0.5Mg_0.5)_x]Mg_0.2}O_3–y (x = 0, 0.1, 0.2, 0.4, and 0.6) and investigate their phase formation, structure, microstructure, and electrical conductivity. Single-phase samples are obtained when up to 10 at % of gallium cations are replaced with silicon and magnesium cations. It is established that silicon-containing samples with the perovskite structure are characterized by a high density, optimal microstructure, dense grain packing, and large electrical conductivities at high temperatures.