• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.07a
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• pp.387-390
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• 2000

The $Al_2$O$_3$specimens were prepared by the conventional mixed oxide method with addition La$_2$O$_3$, Bi$_2$O$_3$. The specimens were sintered at 15$25^{\circ}C$, 5hr., in air. The structural properties of the specimens were investigated by XRD and SEM. The $Al_2$O$_3$ceramics with dopants had hexagonal structure and didn't show secondary phases. In the case of specimens with 0.25wt% La$_2$O$_3$and 0.25wt% Bi$_2$O$_3$bulk densities and lattice parameter of c/a were 3.818g/cm$^3$, 3.783g/cm$^3$and ca=2.725, c/a=2.723, respectively. The bulk densities of $Al_2$O$_3$ceramics were decreased with dopants.