Magnesia and yttria used as doped chemicals are synthesized together withthe aluminia by the coprecipitation. It has been found out that the doped chemicals fill in cubic γ aluminia,the parameter lattice and the diffraction vecteor of γ aluminia almost do notchange with the adding of the doped chemicals. But the doped chemicals make the powdersthinner and the specific surface area larger. It has also been found out that there are somecrystallites in t...
