Dielectric Critical Slowing-Down in Ferroelectric Ca₂Pb(C₂H₅CO₂)₆ Crystal

Abstract

Measurement of the complex dielectric constant of Ca₂Pb(C₂H₅CO₂)₆ (DLP) has been made around the ferroelectric phase transition temperature, T_c. The dielectric dispersion of relaxational type of which the relaxation time shows the critical slowing-down has been observed. The results indicate that the ferroelectric phase transition of DLP is essentially of the order-disorder type. No essential differences are found between DLP and isomorphic Ca₂Sr(C₂H₅CO₂)₆ (DSP) in the static and dynamic dielectric properties around T_c.