Correlations between Curie temperature, relaxation frequency and chemical bonding have been evidenced in ABO3 type ferroelectric perovskites. This approach is extended to Pb(B, B')O3 type relaxor ferroelectric materials for which a high frequency relaxation has been recently observed. A study of relaxation frequency—chemical bonding relations using Extended Hückel theory is proposed. The influence of the covalency of oxygen — cation (B, B') bond on the relaxation frequency in Pb(In1/2Nb1/2)O3, Pb(Sc1/2Nb1/2)O3, Pb(Sc1/2Ta1/2)O3 is shown.
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Elissalde et al. (1997) studied this question.
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