Pressure-Induced Ferroelectricity in (NH4)3H(SO4)2
1977 年 43 巻 6 号 p. 1941-1948
詳細
1977 年 43 巻 6 号 p. 1941-1948
Dielectric properties of single crystal (NH4)3H(SO4)2 were measured in a pressure and temperature region of p\lesssim8.5 kbar and −100°C\lesssimT\lesssimRT. A broad peak of the dielectric constant along the c*-direction which is found around −25°C at 1 atm becomes sharp and intense as pressure increases, and then above 5.0 kbar a ferroelectric phase (Phase VI) appears. Further increase in pressure stabilizes another ferroelectric phase (Phase VII) in a lower temperature region. The VI–VII transition is of the first order. Temperature dependence of the spontaneous polarization was measured at various pressures. A two-sublattice model is presented to interpret the pressure and temperature dependence of the dielectric properties of (NH4)3H(SO4)2.
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