Ferroelectric properties of the [N(CH3)4]2CoCl2Br2 compound

被引：28

作者：

Ben Rhaiem, Abdallah ^{[1
]}

Jomni, Fathi ^{[2
]}

Karoui, Karim ^{[1
]}

Guidara, Kamel ^{[1
]}

机构：

[1] Univ Sfax, Solid State Lab, Fac Sci, Sfax 3000, Tunisia

[2] LMOP, Tunis 2092, Tunisia

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2013年 / 1035卷

关键词：

Calorimetric study; Dielectric permittivity; AC conductivity; STRUCTURAL PHASE-TRANSITIONS; DIELECTRIC-PROPERTIES; X-RAY; RAMAN; (CH3)4NCDCL3; CRYSTALS;

D O I：

10.1016/j.molstruc.2012.09.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Synthesis, X-ray powder and Raman description are reported for [N(CH3)(4)](2)CoCl2Br2 compound. The calorimetric study shows three endothermic peaks at 289 K, 323 K and 408 K. The compound crystallizes in the orthorhombic system, space group Pnma with a = 12.384 angstrom, b = 9.058 angstrom and c = 15.647 angstrom. The dielectric spectra were measured in the frequency range 10(-1)-10(6) Hz and temperature interval from 200 to 305 K. The dielectric permittivity shows that this compound exhibits a ferroelectric-paraelectric phase transition at 290 K. The frequency dependent permittivity is interpreted in the non-Debye model. The temperature dependence of the low frequency limit of the bulk AC conductivity sigma(dc) is well described by the Arrhenius equation: sigma(dc) = sigma(0) exp(-E-a/kT). (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：140 / 144

页数：5

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