Ferroelectric Phase Transition in (NH4)3H(SeO4)2
1977 年 43 巻 6 号 p. 1949-1953
詳細
1977 年 43 巻 6 号 p. 1949-1953
Dielectric properties of single crystal (NH4)3H(SeO4)2 were measured below room temperature. Two phase transitions were found at around +2°C and at −92°C. A λ-type peak of the dielectric constant along the c-direction is found at −92°C, and the crystal shows ferroelectricity below the transition. The temperature dependence of the spontaneous polarization was measured by a pyroelectric method. The Curie temperature linearly increases with increasing hydrostatic pressure up to 8.5 kbar with a slope of 2.3 deg kbar−1.
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