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Zdanowska-Fraczek, M.
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article
Compositional and pressure effects on the phase transition in ferroelectric NH<inf>4</inf>H(ClH<inf>2</inf>CCOO)<inf>2</inf>
Abstract
<p>The effects of pressure and of the substitution of Rb<sup>+</sup> for the ammonium cations on the dielectric responce in NH<sub>4</sub>H(ClH <sub>2</sub>CCOO)<sub>2</sub> (AHCA) crystals have been studied using electric permittivity measurements. The transition temperature (T<sub>c</sub>) decreases with the pressure increasing up to 800 MPa and pressure coefficient dT <sub>c</sub>/dp = -1.4* 10<sup>-2</sup> [K/MPa] has been experimentally determined. In mixed crystals with different Rb<sup>+</sup> admixture proportion, T<sub>c</sub> lowers considerably and additional electric permittivity anomaly is clearly evidenced. The results are discussed assuming a model which combines polarizability effects related to the heavy ion units with the pseudospin tunnelling model.</p>