Abstract
Abstract LiFe 1/2 Co 1/2 VO 4 was prepared by a standard solid-state reaction method and identified by X-ray diffractometry. LiFe 1/2 Co 1/2 VO 4 has orthorhombic crystal structure whose dielectric and electric modulus properties were studied over a range of frequency (100 Hz to 1 MHz) and temperature (299–673 K) using ac technique of complex impedance spectroscopy (CIS). Experimental results show that variation of dielectric constant ( ɛ r ) as a function frequency at different temperatures exhibit a dispersive behavior at low frequencies. The variation of the ɛ r as a function of temperature at different frequencies shows that the transition temperature ( T c ) shifts from 598 to 673 K with decrease in ɛ r on changing frequency from 1 kHz to 1 MHz. Dielectric loss (tan δ ) was also studied over the frequency and temperature ranges. Modulus analysis has been carried out to understand the mechanism of electrical transport process and this indicated non-exponential type conductivity relaxation in the material. The activation energy calculated from electric modulus spectra is ∼0.34 eV.
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