Article ID Journal Published Year Pages File Type
1459344 Ceramics International 2015 7 Pages PDF
Abstract

The influence of the method of sintering on densification, phase assemblage and electrical conductivity of Sr- and Mg-doped lanthanum gallate was investigated aiming to optimize the sintering process of this solid electrolyte. Powder mixtures were prepared by solid state reactions, and the sintering of green compacts was carried out by the two-stage method varying the temperature of the first stage (T1) and the isothermal temperature (T2) and time (t2) profile. The type and content of predominant impurity phases depend on specific parameters of the sintering process. In the first stage of sintering, the content of impurity phases, such as LaSrGaO4 and La4Ga2O9, decreases with increasing temperature. The relative density of sintered specimens reaches 99% whenever T1 is 1500 °C. The mean grain size varies from 1.45 to 4.9 µm. At 600 °C the electrical conductivity attains 12 mS cm−1 for T1 1400 °C and T2 1350 °C for 5 h, with activation energy of approximately 1 eV.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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