Abstract
Effect of hydrostatic pressure on the successive phase transitions in {N(CD 3 ) 4 } 2 -CoCl 4 was studied by dielectric measurements. As pressure increases, the I-II, II-III, and III-IV transition temperatures (23.7°C, 8.3°C, and 4.2°C at 1 atm, respectively) linearly increase with the ratios of 135 deg GPa -1 , 227 deg GPa -1 ,and 205 deg GPa -1 , respectively. The ferroelectric III phase disappears at 0.099 GPa and 30.8°C. The effect of deuteration on the transition sequence is equivalent to application of hypothetical negative pressure of -0.05 GPa.
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