Ferroelectric Phase Transition in Rb₂Cb₂(SO₄)₃

Abstract

Dielectric and elastic measurements were made on Rb₂Cd₂(SO₄)₃ crystal which has a langbeinite-type structure. It was found that Rb₂Cd₂(SO₄)₃ undergoes phase transitions at −144°C and −170°C successively. The low temperature phases are both polar and the polarization is reversed by the application of the electric field. It is thus concluded that the two low temperature phases are ferroelectric.