Grain growth kinetics of textured 0.92Na sub(0.5)Bi sub(0.5)TiO sub(3)-0.08BaTiO sub(3) ceramics by tape casting with Bi sub(2.5)Na sub(3.5)Nb sub(5)O sub(18) templates

Plate-like Bi sub(2.5)Na sub(3.5)Nb sub(5)O sub(18) particles were used as templates to fabricate grain-oriented Na sub(0.5)Bi sub(0.5)TiO sub(3)-BaTiO sub(3) (NBTBT) ceramics by reactive-templated grain growth. The effects of sintering conditions on the grain orientation and microstructure of the t...

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Bibliographic Details
Published in:Journal of electroceramics 2010-05, Vol.24 (3), p.145-152
Main Authors: Gao, Feng, Hong, Rong-zi, Liu, Jia-ji, Yao, Yong-hong, Tian, Chang-sheng
Format: Article
Language:English
Subjects:
Ceramics
Curvature
Grain growth
Grains
Mathematical analysis
Microstructure
Sintering
Texture
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Summary:Plate-like Bi sub(2.5)Na sub(3.5)Nb sub(5)O sub(18) particles were used as templates to fabricate grain-oriented Na sub(0.5)Bi sub(0.5)TiO sub(3)-BaTiO sub(3) (NBTBT) ceramics by reactive-templated grain growth. The effects of sintering conditions on the grain orientation and microstructure of the textured NBTBT ceramics were investigated, and the kinetic mechanism of grain growth is discussed. The results show that textured ceramics were successfully obtained with orientation factor more than 0.6. NBTBT specimens are composed of strip-like grains and equiaxed shaped grains. The textured ceramics have a microstructure with strip-like grains aligning in the direction parallel to the casting plane and exhibit an {h00} preferred orientation. The degree of grain orientation increases initially, then decreases with increasing sintering temperature and soaking time. The maximum texture fraction is 0.69 when sintered at 1185 degree C for 6 h. The kinetic exponent n and activation energy Q of the two types of grain in textured NBTBT ceramics were calculated. The results show that the grain growth mechanism of oriented grains is controlled not only by grain lattice diffusion, but also by grain boundary diffusion. The grain growth mechanism of matrix grains is mainly controlled by the grain boundary curvature.
ISSN:1385-3449
1573-8663
DOI:10.1007/s10832-008-9549-4