The solid electrolytes Nd1-xSrxGa1-xMgxO3-δ (x= 0, 0.03, 0.07, and 0.1) were synthesized by solid-state reactions. As the amount of dopants Sr and Mg increase, the phase was analyzed. The thermal expansion coefficients of Nd1-xSrxGa1-xMgxO3-δ were 1...
The solid electrolytes Nd1-xSrxGa1-xMgxO3-δ (x= 0, 0.03, 0.07, and 0.1) were synthesized by solid-state reactions. As the amount of dopants Sr and Mg increase, the phase was analyzed. The thermal expansion coefficients of Nd1-xSrxGa1-xMgxO3-δ were 11.1~11.7×10-6 K-1. The a.c. conductivities in air by using an impedance analyzer were measured as a function of temperature. The d.c. conductivities and oxygen nonstoichiometries over the range of the oxygen partial pressure from 1 atm to 10-16 atm by Coulometric titration method were measured simultaneously. The electrical conductivity of Nd0.93Sr0.07Ga0.93Mg0.07O3-δ was 5.9×10-3 Scm-1 at 1173 K and was stable over the whole oxygen partial pressure range. The oxygen nonstoichiometry increased with decreasing the oxygen partial pressure.