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The temperature coefficient of capacitance (TCC) of most insulators is dominated by five components. The theoretical analysis of these components is outlined and it is shown that, for given ranges of permittivity, the analysis can be greatly simplified. This simplified treatment is shown to apply to widely different types of compound. Since TCC depends on permittivity, the permittivity of a variety of materials has been rationalized by reference to their `I' factor, which is defined as mean atomic number per cubic ångström.

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