Phase transition and electrical investigation in lithium copper pyrophosphate compound Li 2 CuP 2 O 7 using impedance spectroscopy

Lithium pyrophosphate compound Li2CuP2O7 has been synthesized through solid state reaction method. FTIR and XRD results, realized at room temperature, indicate respectively the dominant feature of pyrophosphate anion (P2O7)4− and a pure monoclinic phase with I2/a space group. Electrical and dielectric properties have been studied using impedance spectroscopy complex over a wide temperature (576–710 K) and frequency (209 Hz–1 MHz) range. From the direct and alternative conductivities (DC and AC), electrical conduction is found to be thermally activated process. The frequency-dependent AC conductivity obeys Jonscher’s universal power law σAC~Aωs. The differential scanning calorimetry spectrum discloses phase transition at 622 K.