Electrical properties and complex impedance analysis of K2ZnV2O7

Abstract

Pyrovanadate K 2 ZnV 2 O 7 has been synthesized by a standard ceramic method. Different techniques have demonstrated a structural phase transition at 575 K. Electrical impedance spectroscopy has been performed over a wide range of frequencies, (200 Hz-1 MHz) and temperatures (514-723 K). Ac conductivity data reveal that for high frequencies, r ac (x) is proportional to x s . The frequency exponent values are found to increase with increasing temperature indicating that the non-overlapping small polaron tunneling is the appropriate conduction mechanism.

Thermally Induced Oxygen Vacancies and High Oxide Ion Conduction in K2ZnV2O7 with a Melilite-Related Structure

“…The polycrystalline K 2 ZnV 2 O 7 was synthesized by a solid-state reaction method according to the literature, , as described in Methods in this work. The single-phase nature of the product was verified by the powder XRD pattern, which can be well indexed with the tetragonal K 2 ZnV 2 O 7 phase (PDF#37-1466) (Figure a).…”