Abstract
The contribution of soft mode at Sb atom's site to the temperature dependences of Sb atom's equilibrium position's difference Δz33 (T) has been studied theoretically, when SbSBr crystal is deformed in direction of c(z)-axis in paraelectric and in ferroelectric phases. The largest change of Δz33 (T) occurs in the ferroelectric phase near the transition temperature TC = 21 K. The temperature dependence of Sb atom's equilibrium position's displacements Δz33 is very similar to the temperature dependence of experimental piezoelectric modulus of SbSBr crystal in ferroelectric phase.
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