Pressure-Induced Ferroelectricity in (NH_4)_3H(SO_4)_2
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Dielectric properties of single crystals of (NH_4)_3H(SO_4)_2 were measured at various hydrostatic pressures up to about 8 kbar below room temperature. The broad peak of dielectric constant along the c^*-direction which appears around -2.5℃ at 1 atm becomes more and more prominent as pressure increases, and then a ferroelectric phase (Phase VI) develops above 4.9 kbar. Another ferroelectric phase (Phase VII) is also found above about 5 kbar in a lower temperature region. The pressure-temperature phase diagram is given.
- 社団法人日本物理学会の論文
- 1976-10-15
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