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Ionic conductivities and dielectric analysis of (C6H20N3)BiI6·H2O compound
Indian Journal of Physics ( IF 1.6 ) Pub Date : 2021-07-19 , DOI: 10.1007/s12648-021-02173-3
Nizar Elfaleh 1 , Sahel Karoui 1 , Slaheddine Kamoun 1
Affiliation  

Thermogravimetric analysis, differential scanning calorimetry analysis and complex impedance spectroscopic data have been carried out on (C6H20N3)BiI6.H2O compound. The results show that this compound exhibits a phase transition at 325 K which was characterized by differential scanning calorimetry spectroscopy and dielectric measurements. The dielectric analysis has been studied by using impedance spectroscopy measurements over a wide range of temperatures and frequencies, 290–350 K and 100 Hz–1 MHz, respectively. The Z′ and Z″ vs. frequency plots are well-fitted to an equivalent electrical circuit consisting of a parallel combination of a bulk resistance Rp (polarization resistance) and constant phase elements CPE (capacity of the fractal interface). The frequency-dependent AC conductivity is well analyzed by Jonscher’s universal power law: σ(ω,T) = σdc(T) + A(T)ωs(T). This suggested hoping conduction due to three theoretical models. The latter can be attributed to the quantum mechanical tunneling model in region I and correlated barrier hopping in region II. The temperature dependence and dielectric relaxation of the DC conductivity satisfied the Arrhenius law. Furthermore, the modulus plots have been characterized by full width at half height or in terms of a non-experiential decay function φ(t) = exp(− t/τ)β. The values of the activation energies obtained from the electrical conductivity and electric modulus are near, which suggests that the transport is probably due to the ion hopping mechanisms.



中文翻译:

(C6H20N3)BiI6·H2O化合物的离子电导率和介电分析

已经对(C 6 H 20 N 3 )BiI 6 .H 2 O化合物进行了热重分析、差示扫描量热分析和复阻抗光谱数据。结果表明,该化合物在 325 K 下表现出相变,其特征在于差示扫描量热光谱和介电测量。介电分析是通过在很宽的温度和频率范围内(分别为 290–350 K 和 100 Hz–1 MHz)使用阻抗谱测量来研究的。的ž '和ž “与频率的关系曲线是公配合到由体电阻的并联组合的等效电路R p(极化电阻)和恒相元素 CPE(分形界面的容量)。Jonscher 的通用幂律很好地分析了与频率相关的交流电导率:σ ( ω , T ) =  σ dc ( T ) + A( T ) ω s ( T ). 这表明由于三个理论模型的希望传导。后者可归因于区域 I 中的量子力学隧道模型和区域 II 中的相关势垒跳跃。直流电导率的温度依赖性和介电弛豫满足阿伦尼乌斯定律。此外,模量图的特征在于半高处的全宽或非经验衰减函数φ ( t ) = exp(-  t / τ ) β。从电导率和电模量获得的活化能值接近,这表明传输可能是由于离子跳跃机制。

更新日期:2021-07-19
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