Further investigations on the electrothermal properties of yttria-doped gallia ceramics

Numerous polycrystalline ceramic specimens of yttria-doped gallia, have been prepared in the solid state, have been studied by powder X-ray diffraction IR and UV spectroscopy. The electrical conductivities (D.C.) measured for various yttria contents and at various temperatures up to 150°C, and the bulk and true density, and the percentage porosity of the test samples are compared. Correlations of the results obtained have been determined. Some evidence of compound formation could be traced if prior firing had been carried out at 1350 °C, this was not the case when firing was carried out at 800°C. Doping gallia with yttria results in a decreased conductivity and an unaltered mode of conduction.