Abstract
SbSI ferroelectric electroceramics has been developed with the increased Curie temperature (T c =58°C). Below T c , the electroceramics possess high volume piezoelectric modulus and other parameters important for applications. Microwave and far IR studies reveled that the main dielectric dispersion lies in the range 1-100 GHz. Ab initio calculations of the soft B 1u mode potential have shown that in paraelectric (PE) phase on approaching T c it becomes of a double well form. The high harmonicity splits the soft mode. The lowest frequency component lies at microwaves and gives the main contribution (Δe m = 25,0000) to static permittivity which follows the Curie-Weiss law. The contribution of IR component (Δe 1R = 1500) weakly depends on temperature.
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