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The temperature coefficient peak of the frequency constant TCF of tetragonal PZT ceramics allows their preparation with tight TCF tolerances. It is shown how the TCF peak can be set to the desired value by modifying the ceramic material with dopants. The typical dependence of the TCF and the TCϵ on the mole fraction of zirconium, which is explained with reference to Devonshire's theory, is significantly influenced by sixth-order Devonshire coefficients.
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