Preparatio of High Sinterable Ba(Mg_1/3Ta_2/3)O_3 Powders by Hydrolysis of Metal Alkoxides

摘要

Ba(Mg_1/3Ta_2/3)O_3{BMT} perovskite powders have been prepared at extremely low temperatures (～100 deg. C) by hydrolysis of Ba, Mg, and Ta ethoxides. The alkoxides were hydrolyzed with a large amount of water (H_2O: alkoxy group molar ratio =10) under refluxing to precipitate a crystalline powder with the BMT pseudo-cubic perovskite structure. The BMT powder was calcined at 1000 deg. C for 3h to yield a suitable powder for pressing and sintering. The calcined powder has high sinterability to provide a high-dense sintered body with the density of 94.0-98.0/100 at a low firing-temperature of 1400 deg. C.