TMAHを用いた逆沈殿法による易焼成カルシア添加酸化セリウム微粉末の合成

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In this paper, we report on the preparation of Ca-doped CeO_2 powders by reverse precipitation from nitrate solutions, and the sinterability of the powders. The precipitants were formed by the addition of tetra-methyl ammonium hydroxide (TMAH) aqueous solution to nitrate solutions, or by the addition of nitrate solution to TMAH solution. Precipitates containing the intended amount of Ca were obtained in the latter way (reserve precipitation), while the amount of Ca in the precipitates prepared in the former way (normal precipitation) was far smaller than that contained in the mixed solutions. Fine powders were obtained by the thermal decomposition of the precipitates prepared by reverse precipitation, and the sinterability of the powders was compared with that of powders prepared by a solid-state reaction. Dense Ca-doped CeO_2 ceramics having a theoretical density of 90% or more were easily obtained using powders prepared by heating the precipitates.
東海大学の論文