The formation of LaGa1-xNixO3 solid solutions with perovskite structures was observed for x-values ranging from 0 to 0.5. The replacement of Ga by Ni resulted in an increasing O non-stoichiometry and electronic and ionic conductivities (table 1). The O-ion transference numbers in air at 1070 to 1220K, as determined by means of Faradaic efficiency measurements, did not exceed 0.005. The O permeation flux increased with the Ni content and was limited mainly by the bulk ionic conductivity. A reduction in the O partial pressure led to a decrease in electronic transport and an increase in ionic conductivity.

Oxygen Ionic and Electronic Transport in La(Ga,Ni)O3 Perovskites. A.A.Yaremchenko, V.V.Kharton, A.P.Viskup, E.N.Naumovich, N.M.Lapchuk, V.N.Tikhonovich: Journal of Solid State Chemistry, 1999, 142[2], 325-35

Table 1

Ionic Conduction Parameters for LaGa1-xNixO3

s = (s0/T) exp[-E/RT]