Ferroelectricity of Inclusion Compounds of Thiourea with Pyridinium Iodide and Nitrate

Aleksandra Pajzderska (1) , Eric Collet (2) , Piotr Czarnecki (1) , Jan Wąsicki (1)

1 Faculty of Physics
2 IPR - Institut de Physique de Rennes

The character of phase transitions in the inclusion compounds of thiourea with pyridinium iodide and nitrate has been analyzed, and a model of ferroelectricity of these compounds has been proposed. Analysis of the temperature dependence of specific heat and intensity of the Bragg peaks has shown that the ferro-paraelectric phase transitions are continuous, in contrast to the nonferroelectric phase transitions. The ferroelectricity of the inclusion systems studied is of the mixed type and has a displacement component and an order−disorder component.

Aleksandra Pajzderska, Eric Collet, Piotr Czarnecki, Jan Wąsicki. Ferroelectricity of Inclusion Compounds of Thiourea with Pyridinium Iodide and Nitrate. Journal of Physical Chemistry C, 2009, 113 (15), pp.6282-6289. ⟨10.1021/jp9004295⟩. ⟨hal-00666090⟩