Journal of the Ceramic Society of Japan
Online ISSN : 1882-1022
Print ISSN : 0914-5400
ISSN-L : 0914-5400
Effect of Firing Atmosphere on the Cubic-Hexagonal Transition in Ba0.99Sr0.01TiO3
Nobuyuki TAKEUCHIHidemitsu TANAKAMitsuru WAKAMATSUYukio SAKABEKikuo WAKINO
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1990 Volume 98 Issue 1140 Pages 836-839

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Abstract

Ba0.99Sr0.01Tio3 ceramics were fired for 1 hour at a temperature from 1410° to 1460°C in H2-N2 atmospheres. A pure hexagonal phase, which was not formed by calcination in air, was obtained by firing for 1 hour at 1430°C in H2 atmosphere. A part of the oxygen in Ba0.99Sr0.01TiO3 was removed under the reducing condition, which led to the formation of the hexagonal phase. The amount of the hexagonal phase of Ba0.99Sr0.01TiO3-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 Ba0.99Sr0.01TiO3-x was higher than that of BaTiO3-x, and oxygen deficiency required for stabilizing the hexagonal phase was larger than that for BaTiO3-x. These results indicated that Ba0.99Sr0.01TiO3-x does not easily transformed into the hexagonal phase.

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