Anomalous dielectric behavior in centrosymmetric organic-inorganic hybrid bis-tetrapropylammonium hexachlorostannate. Crystal structure and properties

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• 作者：Sondes Hajlaoui ; Isk ; ar Chaabane ; Abderrazak Oueslati ; Kamel Guidara
• 关键词：Hydrides ; Chemical synthesis ; Differential scanning calorimetry (DSC) ; Crystal structure ; Dielectric properties
• 刊名：Solid State Sciences
• 出版年：November, 2013
• 年：2013
• 卷：25
• 期：Complete
• 页码：134-142
• 全文大小：1846 K

文摘

A new organic-inorganic [N(C₃H₇)₄]₂SnCl₆ compound has been synthesized and characterized by single-crystal X-ray diffraction, differential scanning calorimetry and dielectric measurement. The crystal structure refinement shows that the [N(C₃H₇)₄]₂SnCl₆ compound crystallizes in the orthorhombic system (Pbca space group) with the following unit cell dimension: a聽=聽15.818 (2) 脜, b聽=聽14.913 (2) 脜, c聽=聽29.131 (4) 脜 and Z聽=聽8. The differential scanning calorimetry spectrum discloses phase transitions at 244 and 362聽K and a decomposition of the sample at 411聽K. The temperature dependences of the real and imaginary parts of dielectric permittivity show a relaxation process at high temperature which can be explained by reorientational motion of alkyl chains. The variation of the dielectric loss log () with log (蠅) is found to follow the empirical law, . The dependence of the exponent m (T) on temperature, suggests that the correlated barrier hopping is the appropriate model for the conduction mechanism.