The Dielectric and Dilatometric Single Crystal Studies of Phase Transitions in a New Member of Family of Halogenoantimonates(III) [C(NH₂)₃l₂SbCl₅· [C(NH₂)₃]Cl

Abstract

The results of dielectric, dilatometric and DSC studies on a new member of the family of alkylammonium halogenoantimonates ([(C(NH2)3]2SbCl5 • [(C(NH2)3]C1) are presented. This com pound undergoes three phase transitions at 146 K, 162 K, and 366 K. The two low temperature transitions are suggested to be of the displacive type and the high temperature one of the order-disorder type. The character of temperature changes of the electric permittivity at the lowest temper ature transition suggest a polar phase below the transition temperature.

Structure–property relationships in hybrid (C3H5N2)3[Sb2I9] and (C3H5N2)3[Bi2I9] isomorphs

“…Similar halogenoantimonates(III) and halogenobismuthates(III) based on the guanidinium crystallize with three different chemical compositions: R 2 MX 5 , R 3 M 2 X 9 and R 3 MX 6 . [27][28][29] The findings concerning (CH 3 NH 3 ) 3 [Bi 2 I 9 ] and its guanidinium analogs have motivated us to extend the study on other R 3 M 2 I 9 iodide compounds to check how the replacement of the guanidinium or methylammonium cations by imidazolium modifies the structure and ferroicity of the compound.…”