Author： Eaney I. M. R Wise P. Breeze J. Alford N. McN. Iddles D. Cannell D. Price T.
Publisher： Taylor & Francis Ltd
ISSN： 0141-8610
Source： Philosophical Magazine. A. Physics of Condensed Matter. Defects and Mechanical Properties, Vol.81, Iss.2, 2001-02, pp. : 501-510
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Abstract
Developing a material with a temperature coefficient of the resonant frequency (TCF) of zero is probably the most difficult aspect of research into microwave dielectric ceramics. There are a host of high-quality-factor (Q) highrelative-permittivity (epsilonr) materials whose TCF is far too high to be usable, notably TiO2 (r = 104; Q = 14 000 at 3 GHz; TCF = +427 ppm K-1). The challenge is to find ways of tuning TCF while maintaining values of epsilonr and Q suitable for use in microwave components. This paper explains, in terms of octahedral tilting and r dilution, the tunability of TCF or, more precisely, the temperature coefficient of epsilonr in Ca and Sr titanate-based ceramics. Examples of the structural changes that occur during tuning are also shown.
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