Pressure-Induced Ferroelectricity in Ca₂Ba(C₂H₅CO₂)₆ (DBP)

Abstract

Dielectric properties of Ca₂Ba(C₂H₅CO₂)₆ single crystals have been studied at hydrostatic pressure of about 0.9 kbar. It has been found that the high-pressure phase V is ferroelectric. D-E hysteresis loop at 60 Hz is observed only on annealed specimens, but not on as-grown crystals. It is suggested that the ferroelectric phase V of Ca₂Ba(C₂H₅CO₂)₆ corresponds to those well-known ferroelectric phases II of Ca₂Sr(C₂H₅CO₂)₆ and Ca₂Pb(C₂H₅CO₂)₆ which are realized at atmospheric pressure.