Piezoelectricity and elastic compliance of K2ZnCl4crystals in temperature range from 12 to 420 k

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Abstract
Elastic compliances, piezoelectric coefficients and damping coefficients were determined for K2ZnCl4 by the series resonance method for the temperature range from 120 K to the temperature of ferroelectric phase transition, at 408 K. The measurements were performed along the three main crystallographic axes as well as along directions: [011], [101] and [110]. Jump changes in d31 components of the piezoelectric tensor were estimated on the grounds of the phenomenological theory and the results obtained were compared with the experiment. At 210 K and 335 K, further anomalies in piezoelectric effect and resonance oscillation damping were observed to appear. The anomalies were related with the presence of Vk type defects in the crystal lattice as well as with the formation of a metastable chaotic state.