Effect of Hydrostatic Pressure on the Phase Transitions in K2ZnCl4

Effect of hydrostatic pressure on the normal(I)-incommensurate(II)-ferroelectric(III) phase transitions in K 2 ZnCl 4 was studied by differential thermal analysis and dielectric constant measurements. The I-II transition temperature (283°C at 0 GPa) increases with increasing pressure with a rate of 110 K GPa -1 . The II-III transition temperature (the ferroelectric Curie temperature: 127°C at 0 GPa) decreases with an initial slope of -86.2 K GPa -1 as pressure increases. The results were compared with previously reported pressure effects of other K 2 SeO 4 -group ferroelectrics.

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