Effect of the sintering temperature on the Ba(Zn1/3Ta2/3)O3 dielectric properties

Barium zinc tantalate, with Zn and Ta in the ratio 1:2, was synthesised by solid state reaction. The mixed powders were calcined at 925 C, milled, and then calcined at 1000 C. Pressed specimens were sintered in air at 1150 C for 2.5 h, and finally at 1400-1600 C in air for 4 h. The specimens exhibit...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2007, Vol.27 (2-3), p.1117-1122
Main Authors: IOACHIM, A, TOACSAN, M. I, BANCIU, M. G, NEDELCU, L, DUTU, C. A, FEDER, M, PLAPCIANU, C, LIFEI, F, NITA, P
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Electrotechnical and electronic ceramics
Exact sciences and technology
Technical ceramics
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Summary:Barium zinc tantalate, with Zn and Ta in the ratio 1:2, was synthesised by solid state reaction. The mixed powders were calcined at 925 C, milled, and then calcined at 1000 C. Pressed specimens were sintered in air at 1150 C for 2.5 h, and finally at 1400-1600 C in air for 4 h. The specimens exhibited low loss at microwave frequencies, the dielectric loss decreasing with increasing sintering temperature. Particularly low dielectric loss was achieved by annealing for 10 h at 1400 C. The lowest loss corresponded to completely ordered material with a strongly distorted unit cell. Dielectric loss was little influenced by porosity. The well-sintered and annealed specimens had a dielectric constant of about 31 and a quality factor of up to 130000. 7 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2006.05.023