Raman studies of phase transitions in ferroelectric [C₂H₅NH₃]₂ZnCl₄

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• 作者：C. Ben Mohamed^a ; K. Karoui^a ; ^{karouikarim36@yahoo.com} ; A. Bulou^b ; A. Ben Rhaiem^a
• 关键词：Hybrid material ; Differential scanning calorimetric (DSC) ; Raman spectroscopy and dielectric constant
• 刊名：Physica E: Low-dimensional Systems and Nanostructures
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：87
• 期：Complete
• 页码：141-149
• 全文大小：1746 K
• 卷排序：87

文摘

The present paper accounted for the synthesis, differential scanning calorimetric and vibrational spectroscopy of [C2H5NH3]2ZnCl4grown at room temperature. Differential scanning calorimetric (DSC) disclosed five phase transitions at T1=231 K, T2=234 K, T3=237 K, T4=247 K and T5=312 K. The temperature dependence of the dielectric constant at different temperatures proved that this compound is ferroelectric below 238 K. Raman spectra as function temperature have been used to characterize these transitions and their nature, which indicates a change of the some peak near the transitions phase. The analysis of the wavenumber and the line width based on the order–disorder model allowed to obtain information relative to the thermal coefficient and the activation energy near the transitions phase.