Impact of Oxygen Non?Stoichiometry on Near?Ambient Temperature Ionic Mobility in Polaronic Mixed?Ionic?Electronic Conducting Thin Films

Enhanced ionic mobility in mixed and electronic conducting solids contributes to improved performance of memristive memory, energy storage conversion, catalytic devices. Ionic can be significantly depressed at reduced temperatures, for example, due defect association therefore needs monitored. Measurements transport conductors, however, proves difficult dominant conductivity. This study examines the impact different levels quenched-in oxygen deficiency on vacancy near room temperature. A praseodymium doped ceria (Pr0.1Ce0.9O2–? ) film is grown by pulsed laser deposition annealed various partial pressures modify its concentration. Changes non-stoichiometry are monitored tracking optical absorption related oxidation state Pr ions. 13-fold increase 60 °C increases from 0.032 0.042 detected with negligible changes migration enthalpy large pre-factor. Several factors potentially contributing pre-factor examined discussed. Insights into how concentration markedly should help elucidating origins variations seen nanoionic