Abstract
The electrical properties of Zn1−x Ca x O (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.
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