Ferroelectric transition in Cs1−X(NH4)xHSO4 solid solutions

Abstract Dielectric investigations show three anomalies for some Cs1−x(NH4)xHSO4 (x = 0.05, 0.1 and 0.25) compositions. The paraelectric-ferroelectric phase transition is well defined in the 280–320 K temperature range. A dipolar-type relaxation is observed only for x = 0.25. The high-temperature phase transition is a plastic phase with highly orientational disorder.