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The temperature coefficient of the dielectric permittivity (τϵ) and resonant frequency (τf) of perovskites and related materials is important in the application of these ceramics to microwave filters and resonators. Recent work has directly related changes in τϵ, and therefore τf, to the onset of octahedral tilting in Ba- and Sr-based complex perovskites. Whether a compound is tilted at room temperature or not depends largely on the tolerance factor, t. The relationship between t and τϵ is reviewed in perovskites and the effect of changing tolerance factor on τϵin the perovskite-related solid solution series Ba6-3xNd8+2xTi18O54 is discussed. Transmission electron microscopy is used to demonstrate examples of phase transformations in the above systems
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Reaney et al. (1999) studied this question.
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