Size effects on electrical properties of sol–gel grown chromium doped zinc oxide nanoparticles
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第3期
论文作者：Davit Dhruv A.D.Joshi
文章页码：488 - 495
摘 要：In this communication, we report the results of the studies on electrical properties of Zn0.95Cr0.05O nanoparticles synthesized using sol–gel method. X–ray diffraction（XRD） and transmission electron microscopy（TEM） measurements were performed for the structural and microstructural behaviors of the nanoparticles. Rietveld analysis was carried out to confirm the single phasic nature. High resolution TEM（HRTEM） confirms the nanoscale nature and polycrystalline orientations in the samples. Dielectric response has been understood in the context of universal dielectric response（UDR） model along with the Koop’s theory and Maxwell – Wagner（M–W） mechanism. Variation in ac conductivity with frequency has been discussed in detail in terms of power law fits. Results of the impedance measurements have been explained on the basis of crystal cores and crystal boundary density. Cole – cole behavior has been studied for the impedance data. For potential application of nanoparticles, average normalized change（ANC） in impedance has been estimated and discussed in the light of size effects and oxygen vacancies.
Davit Dhruv1,2，A.D.Joshi4
4. Department of Nanoscience and Advanced Materials, Saurashtra University
摘 要：In this communication, we report the results of the studies on electrical properties of Zn0.95Cr0.05O nanoparticles synthesized using sol–gel method. X–ray diffraction（XRD） and transmission electron microscopy（TEM） measurements were performed for the structural and microstructural behaviors of the nanoparticles. Rietveld analysis was carried out to confirm the single phasic nature. High resolution TEM（HRTEM） confirms the nanoscale nature and polycrystalline orientations in the samples. Dielectric response has been understood in the context of universal dielectric response（UDR） model along with the Koop’s theory and Maxwell – Wagner（M–W） mechanism. Variation in ac conductivity with frequency has been discussed in detail in terms of power law fits. Results of the impedance measurements have been explained on the basis of crystal cores and crystal boundary density. Cole – cole behavior has been studied for the impedance data. For potential application of nanoparticles, average normalized change（ANC） in impedance has been estimated and discussed in the light of size effects and oxygen vacancies.
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