Abstract
Dielectric, DSC and preliminary X-ray diffraction studies on [(C2H5)4N]3Sb2Br9 (TEABA) and [(C2H5)4N]3Bi2Br9 (TEABB) are reported. The compounds are isomorphous, space group P6322. The static electric permittivity measurements on single crystals in the temperature range 220 - 290 K revealed that both compounds show two distinct dielectric anomalies; TEABA at Tc1 = 258 K and Tc2 = 252 K, while TEABB at Tc1= 265 K and Tc2 = 248 K. The DSC studies show only one anomaly of first order at Tc1 =258 K for TEABA, and Tc1 =266 K for TEABB. These transitions are presumably related to a freezing of the reorientational motion of the tetraethylammonium cations
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