The correlation between the structure and the dielectric properties of KxBa1-xGa2-xGe2+xO8 ceramics

A study of KxBa1-xGa2-xGe2+xO8 ceramics revealed that these solid solutions undergo a monoclinic-to-monoclinic P21/a-C2/m phase transition. The temperature of this phase transition decreased with increasing x, in a similar way to the sintering temperature, which decreased from 1100 C (x = 0) to 970...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2007, Vol.27 (8-9), p.2957-2961
Main Authors: MARJETA MACEK KRZMANC, MEDEN, Anton, SUVOROV, Danilo
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:A study of KxBa1-xGa2-xGe2+xO8 ceramics revealed that these solid solutions undergo a monoclinic-to-monoclinic P21/a-C2/m phase transition. The temperature of this phase transition decreased with increasing x, in a similar way to the sintering temperature, which decreased from 1100 C (x = 0) to 970 C (x = 1). The temperature of the P21/a-C2/m phase transition was below the sintering temperature of KxBa1-xGa2-xGe2+xO8 (x = 0.67-1) solid solutions, whereas the compositions at lower x (x = 0.4 and 0) remained in the P21/a modification over a wide temperature range above the sintering temperature. Compared to the C2/m modification of KxBa1-xGa2-xGe2+xO8 (x = 0.67-1), with a permittivity of 6.2-6.9, the P21/a modifications had permittivities of 5.9-7.0 and three-to-eight times higher Qxf values of about 100000 GHz (at about 12 GHz). The temperature coefficient of the resonant frequency was about -25 ppm/K, regardless of the composition. 9 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2006.11.021