Hydrostatic Pressure Effect on the Dielectric Properties of K2SeO4

Hydrostatic pressure effect on the dielectric constant ε c or K 2 SeO 4 was studied. The incommensurate transition temperature T 2 lowers linearly with the slope of -7.3 ±0.2 K/kbar. The Curie temperature T 3 also decreases with pressure, but the slope denpends on pressure; the initial slope is -17.2 ±2.5 K/kbar and the slope above 0.6 kbar is -11.4 ±1.0 K/kbar. The dielectric behaviors under the pressure are qualitatively discussed based on the theoretical treatments already developed by other authors, and some problems are suggested.