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Tylczyński, Zbigniew
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Publications (4/4 displayed)
- 2022Above-room-temperature ferroelectricity and piezoelectric activity of dimethylglycinium-dimethylglycine chloridecitations
- 2015Ferroelastoelectric phase transition in (NH<inf>4</inf>)<inf>2</inf>CuCl<inf>4</inf>·2H<inf>2</inf>O single crystalcitations
- 2014Pyroelectric, piezoelectric, elastic and dielectric properties of triglycine - Zinc chloride crystalcitations
- 2013Long time dependence of complex dielectric permittivity in triglycine-zinc chloride crystal below room temperature
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article
Ferroelastoelectric phase transition in (NH<inf>4</inf>)<inf>2</inf>CuCl<inf>4</inf>·2H<inf>2</inf>O single crystal
Abstract
<p>The (NH<sub>4</sub>)<sub>2</sub>CuCl<sub>4</sub>·2H<sub>2</sub>O crystal exhibits anomalous thermal, piezoelectric, dielectric and elastic properties in the vicinity of the ferroelastoelectric phase transition at T<sub>C</sub> = 200 K. Macroscopic order parameter is the h<sub>36</sub> component of the spontaneous piezoelectric tensor connecting polarisation P<sub>3</sub> and strain η<sub>6</sub>. The temperature change in h<sub>36</sub> component was proportional to (T<sub>C</sub> - T)<sup>α</sup>, where α = 0.58 ± 0.05. Close to T<sub>C</sub> changes in dielectric permittivity were negligible. High value of ac conductivity in the high-temperature phase results from protons jumping between disordered ions NH<sub>4</sub><sup>+</sup> and between molecules of crystallisation water. Only longitudinal ultrasonic waves exhibited an abrupt change upon the phase transition. The relaxation time of the order parameter was determined from anomalous changes in attenuation of the longitudinal waves.</p>