Relaxation studies of spray deposited Bi2Co_(0.1)V_(0.9)O_(5.35) solid electrolyte thin films on stainless steel substrate

摘要

The room temperature-stabilized γ-phase ion conducting Bi2Co_(0.1)V_(0.9)O_(5.35) thin film was deposited by spray pyrolysis on stainless steel substrate. The intra-grain and grain interior charge transfer was confirmed in these films with impedance spectroscopic measurements done from 1 Hz to 10 MHz in the temperature range 550 K to 741 K. Impedance data further revealed non-Debye kind of relaxation dispersion in the film. The relaxation frequency ranges from 10 to 100 Hz, which predicts long range jumping of the oxygen ions with chemical diffusivity. The Arrhenius plots for relaxation frequency and grain boundary conductivity were found to have same activation energy revealing grain boundary dominant conduction. The effect of polycrystallinity on relaxation dispersion is investigated for the first time on Bi2Co_(0.1)V_(0.9)O_(5.35) thin films using impedance formalism.