Dielectric Properties of Rb₂CdBr₄and Rb₂HgBr₄

Abstract

Abstract Phase transitional properties of Rb2CdBr4 and Rb2HgBr4 were investigated. The differential thermal analysis for Rb2CdBr4 indicates the same supercooled nature of the phase transition as observed in A2BX4-type halides with the structure of Sr2GeS4-type. On the other hand, the temperature dependence of the dielectric constant of Rb2HgBr4 shows two anomalies at low temperatures, which are analogous to those of Cs2HgBr4 and Cs2ZnI4 with the structure of orthorhombic β-K2SO4-type. * Paper originally presented at 10th European Meeting on Ferroelectricity, Cambridge, U.K., August 3–8, 2003. Keywords: Rb2CdBr4 Rb2HgBr4 phase transitionSr2GeS4 structureβ-K2SO4 structureα-β transition Acknowledgments Authors thank Prof. K. Gesi of Iwaki Meisei University, Prof. T. Yamaguchi of Meisei University and Prof. H. Mashiyama of Yamaguchi University for valuable discussions and Mr. N. Okabe for his assistances of experiments. Notes * Paper originally presented at 10th European Meeting on Ferroelectricity, Cambridge, U.K., August 3–8, 2003.