Ferroelectric transition in Cs_1−X(NH₄)_xHSO₄ solid solutions

H. Khemakhem Laboratoire de l'Etat Solide de Sfax, 3038, Sfax, Tunisia; Institut de la Matière Condensée de Bordeaux, Château Brivazac, Avenue du docteur A. Schweitzer, 33608, Pessac, France

T. Mhiri Laboratoire de l'Etat Solide de Sfax, 3038, Sfax, Tunisia

Z. Fakhfakh Laboratoire de l'Etat Solide de Sfax, 3038, Sfax, Tunisia

A. Daoud Laboratoire de l'Etat Solide de Sfax, 3038, Sfax, Tunisia

Abstract

Dielectric investigations show three anomalies for some Cs_1−x(NH₄)_xHSO₄ (x = 0.05, 0.1 and 0.25) compositions. The paraelectric-ferroelectric phase transition is well defined in the 280–320 K temperature range. A dipolar-type relaxation is observed only for x = 0.25. The high-temperature phase transition is a plastic phase with highly orientational disorder.

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Ferroelectric transition in Cs_1−X(NH₄)_xHSO₄ solid solutions

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Ferroelectric transition in Cs_1−X(NH₄)_xHSO₄ solid solutions