Abstract
Abstract The temperature dependence of the dielectric permittivity is studied in different Pb(Mg⅓Nb⅔)O3 based ceramics, in which the ordered region size can be changed by introducing titanium or lanthanum ions. Both the relaxor behaviour and the nonlinear dielectric component are found to be dependent on the impurity content. Especially, the nonlinearity increases strongly as the material exhibits a more conventional ferroelectric behaviour, i.e. as the size of the polar clusters, which develop in the paraelectric matrix, increases.
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