Fabrication and dielectric properties of textured Na0.5Bi0.5TiO3-BaTiO3 ceramics by RTGG method

Grain-oriented Na 0.5 Bi 0.5 TiO 3 -BaTiO 3 (NBTBT) ceramics were fabricated by reactive-templated grain growth using plate-like Bi 2.5 Na 3.5 Nb 5 O 18 (BNN) as templates. The specimens are composed of NBTBT perovskite phase and BNN lay-structured phase. Textured ceramics have a brick-wall microstr...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2008-12, Vol.19 (12), p.1228-1232
Main Authors: Gao, Feng, Cheng, Li-Hong, Hong, Rong-Zi, Liu, Jia-Ji, Yao, Yong-Hong, Tian, Chang-Sheng
Format: Article
Language:English
Subjects:
Applied sciences
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dielectric properties
Electronics
Exact sciences and technology
Grain growth
Materials
Materials Science
Optical and Electronic Materials
Phase transitions
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Summary:Grain-oriented Na 0.5 Bi 0.5 TiO 3 -BaTiO 3 (NBTBT) ceramics were fabricated by reactive-templated grain growth using plate-like Bi 2.5 Na 3.5 Nb 5 O 18 (BNN) as templates. The specimens are composed of NBTBT perovskite phase and BNN lay-structured phase. Textured ceramics have a brick-wall microstructure with strip-like grains aligning in the direction parallel to the casting plane and exhibit an {h00} preferred orientation. The texture fraction increases initially, and then decreases with increasing sintering temperature. The optimal sintering temperature is 1,185 °C where the texture fraction has a maximum value of 0.58 and d 33 is 98 pC/N. The textured NBTBT ceramics show evidence of relaxor ferroelectrics with diffuse phase transition and frequency dispersion because of composite biphasic structure.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-007-9547-3