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Thermal Expansions of Ferroelectric Rb2CdI4
Toshihisa Yamaguchi,Fuminao Shimizu,Masaaki Takashige,Tadashi Kurihama 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
The ferroelectric Rb2CdI4 shows the largest peak of the dielectric constant at the Curie point (Tc = 211 K) among the Tl2ZnI4 group ferroelectrics of Sr2GeS4-type crystal structure (monoclinic system). Furthermore, the shoulder-like anomaly in the dielectric constant of Rb2CdI4, as for most ferroelectrics of this group, appears at the temperature (Ts = 150 K), which is lower by 50 degrees than Tc. In this research, thermal expansions of the crystal grown by the Bridgman method were measured in the temperature range from 4 K to 500 K by using a clip-type strain-gauge dilatometer. The feature of a second-order transition had appeared clearly at Tc = 211 K in thermal expansions xi (i = a, b, and c; a is perpendicular to the a-plane); however, anomalies were not seen clearly around the Ts.
Possible Existence of α-β phase transition in Tl2ZnCl4
Fuminao Shimizu,Koh-ichi Suzuki,Masaaki Takashige,Tadashi Kurihama,Toshihisa Yamaguchi 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
It was revealed that Bridgman crystals of Tl2ZnCl4 have a supercooled state of the hightemperature phase with orthorhombic K2SO4 structure, as seen in Tl2ZnI4 group substances. The original stable phase at room temperature is ff-phase with monoclinic Sr2GeS4 structure. The transition point exists around 340 K, and the phase-transition point was conrmed at 363 K in the -phase. Furthermore, on cooling, another phase transition point was conrmed at 173 K in the supercooled-phase.