Dielectric and electric studies of the [N(CH₃)₄][N(C₂H₅)₄]ZnCl₄ compound at low temperature

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• 作者：K. Karoui^a ; ^{karimkaroui36@yahoo.com} ; A. Ben Rhaiem^a ; F. Hlel^a ; M. Arous^b ; K. Guidara^a
• 关键词：[N(CH3)4][N(C2H5)4]ZnCl4 ; ferroelectric ; Equivalent circuit ; Modulus complex ; conductivity
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 March, 2012
• 卷：133
• 期：1
• 页码：1-7
• 文件大小：738 K

摘要

The [N(CH₃)₄][N(C₂H₅)₄]ZnCl₄ compound was prepared and characterized by electrical technique. The temperature dependence of the dielectric permittivity shows that this compound is ferroelectric below T = 268 K. The two semi-circles observed in the complex impedance identify the presence of the grain interior and grain boundary contributions to the electrical response in the material. The equivalent circuit is modeled by a combination series of two parallel R_P-CPE circuits. The frequency dependent conductivity is interpreted in term of Jonscher's law. The modulus plots can be characterized by the empirical Kohlrausch-Williams-Watts (K.W.W.) function: 蠒(t) = exp [(鈭抰/蟿)^尾]. The temperature dependence of the alternative current conductivity (蟽_p), direct current conductivity (蟽_dc) and the relaxation frequency (f_p) confirm the presence of the ferroelectric-paraelectric phase transition.