Temperature dependence of the coarsening behavior of (Ba, Sr)TiO3 grains dispersed in a SiO2-rich liquid matrix

The shape of (Ba0.35Sr0.65)TiO3 (BST) grains and their coarsening behaviour were investigated as a function of temperature. Powder compacts were heated at a rate of 130 C/min and sintered at 1390 C and 1420 C, respectively. The sintering time was varied from 5 to 15 h. The BST grains exhibit a morph...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2003-09, Vol.23 (10), p.1565-1569
Main Authors: JO, Wook, CHUNG, Ui-Jin, HWANG, Nong-Moon, KIM, Doh-Yeon
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
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Summary:The shape of (Ba0.35Sr0.65)TiO3 (BST) grains and their coarsening behaviour were investigated as a function of temperature. Powder compacts were heated at a rate of 130 C/min and sintered at 1390 C and 1420 C, respectively. The sintering time was varied from 5 to 15 h. The BST grains exhibit a morphological change at approximately 1410 C; the grains were angular at 1390 C and corner-rounded at 1420 C. At 1390 C, a few very large grains appear in the microstructure. Such abnormal grain growth is explained in terms of a coarsening advantage due to the Sigma3 coincident site lattice (CSL) boundaries. On the other hand, at 1420 C, normal grain growth occurred. The change in coarsening behaviour with temperature is related to the structural transition of the interface. 32 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(02)00402-8