Impact of divalent dopant Ca2+ on the electrical properties of ZnO by impedance spectroscopy
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- 作者：TANUSHREE DAS ; BIKRAM KESHARI DAS ; S K S PARASHAR…
- 关键词：XRD ; Zn1−xCaxO ; impedance spectroscopy.
- 刊名：Bulletin of Materials Science
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：40
- 期：1
- 页码：247-251
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general; Engineering, general;
- 出版者：Indian Academy of Sciences
- ISSN：0973-7669
- 卷排序：40
文摘
The electrical properties of Zn1−xCaxO (x = 0, 0.01, 0.02 and 0.03) nanoceramics synthesized by solid-state reaction method were investigated by complex impedance spectroscopy (CIS) from room temperature to 500∘C. Structural analysis of the synthesized material using the X-ray diffraction technique suggests that they exhibit a single phase with hexagonal wurtzite structure. Experimental results indicate that the synthesized material shows temperature-dependent relaxation phenomena. The variation of frequency exponent (s) with temperature shows the presence of thermally activated polarization mechanism in the synthesized sample. Dielectric constant was found to decrease with increase in frequency and temperature for Ca-doped samples. Ca-doped ZnO sample shows dielectric loss at lower temperature than that of pure ZnO.