Peculiarities of electromechanical properties of ferroelectric NH₄HSeO₄

V. S. Krasikov USSR Acad. Sci., Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR

M. P. Zaitseva USSR Acad. Sci., Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR

L. A. Shabanova USSR Acad. Sci., Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR

V. M. Zrazhevsky USSR Acad. Sci., Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR

L. I. Zherebtsova USSR Acad. Sci., Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR

K. S. Aleksandrov USSR Acad. Sci., Siberian Branch, L. V. Kirensky Institute of Physics, Krasnoyarsk, 660036, USSR

Abstract

Dielectric, piezoelectric and elastic properties of NH₄HSeO₄ crystal were studied in temperature range 180–300 K. Some anomalies of the properties near T_c=250 K and T_i=261 K were found. These anomalies are caused by high dielectric permeability along b-axis above T_i and the symmetry-forbidden piezoelectric coupling. An effort of phenomenological description of the successive phase transitions is made.

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Peculiarities of electromechanical properties of ferroelectric NH₄HSeO₄

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Peculiarities of electromechanical properties of ferroelectric NH4HSeO4

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Peculiarities of electromechanical properties of ferroelectric NH₄HSeO₄