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Abstract
The method of thermally-induced electric oscillations was employed in studying the temperature dependences of elastic and piezoelectric coefficients in TGS. The results are compatible with those reported in the literature. As shown previously, the crystal softens significantly in the vicinity of the phase transition. Having measured the amplitude of the oscillations, we found a temperature-activated contribution to the expected square-root dependence of the piezoelectric modulus. This effect has been attributed to the formation of paraelectric clusters. Close to the phase transition temperature, deviations from the exponential behavior have been found.