Ba_<0.99>Sr_<0.01>TiO_3の立方晶-六方晶転移に及ぼす焼成雰囲気の影響 : 組成・構造

概要

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Ba_<0.99>Sr_<0.01>TiO_3 ceramics were fired for 1 hour at a temperature from 1410° to 1460℃ in H_2-N_2 atmospheres. A pure hexagonal phase, which was not formed by calcination in air, was obtained by firing for 1 hour at 1430℃ in H_2 atmosphere. A part of the oxygen in Ba_<0.99>Sr_<0.01>Ti_O3 was removed under the reducing condition, which led to the formation of the hexagonal phase. The amount of the hexagonal phase of Ba_<0.99>Sr_<0.01>TiO_<3-x> increased proportionally with an increase in oxygen deficiency (x). The value of x required for stabilizing the hexagonal phase at room temperature was found to be larger than 0.008. The transition temperature from cubic to hexagonal phase of Ba_<0.99>Sr_<0.01>TiO_<3-x> was higher than that of BaTiO_<3-x> and oxygen deficiency required for stabilizing the hexagonal phase was larger than that for BaTiO_<3-x>. These results indicated that Ba_<0.99>Sr_<0.01>TiO_<3-x> does not easily transformed into the hexagonal phase.
社団法人日本セラミックス協会の論文
1990-08-01