材料科学
电介质
活化能
拉曼光谱
结晶度
纳米晶材料
兴奋剂
微晶
极化子
分析化学(期刊)
介电损耗
放松(心理学)
复合材料
纳米技术
光电子学
光学
物理化学
物理
社会心理学
量子力学
电子
化学
冶金
色谱法
心理学
作者
Wiem Bouslama,Monaam Ben Ali,N. Sdiri,Habib Elhouichet
标识
DOI:10.1016/j.ceramint.2021.03.257
摘要
Fe doped ZnO nanocrystals (NCs) were synthesized from low cost sol gel method and the effect of iron content on their structural, transport and dielectric properties was studied. X-ray diffraction (XRD) measurements exhibit good crystalline quality of all the prepared NCs and a reduction of the crystallite size with Fe doping. Raman spectra confirmed the good crystallinity and revealed the formation of ferric phases for highly doped samples. Investigations of the impedance characteristics indicate that the samples are perfectly modulated from equivalent circuits using a constant phase element (CPE). Analysis of complex impedance and electrical modulus revealed a relaxation process dependent on temperature and of non-Debye type. Single activation energy was estimated for the electronic conduction, based on the Arrhenius plots. The conduction mechanism was governed from small polaron hopping in all the ZnO:Fe materials. The frequency dependence of the electric conductivity followed a simple Jonscher power behavior σac(ω)=σdc+Aωs (0.5≤ s ≤ 1), where the exponent s increased with temperature. The dielectric measurements, in both medium and high frequency regions, exhibited high dielectric constant values and low dielectric losses for all the samples, which could favor the use of Fe doped ZnO a as promising candidate for energy storage. The electrical modulus provides double relaxation times with low values. All the properties indicate that the ZnO:Fe material is suitable for device applications.
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