A continued study of muonium diffusion in transparent conducting oxides (TCO) are proposed. We have ZF depolarization measurements conducted up to room temperatures for SnO2 and CdO, up to 500K for In2O3 and 700K for Ga2O3. Depolarization data have common features for all the samples. At low temperatures, static KT delta indicates shallow donor ionization and some form of local motion. At higher temperatures, static delta parameter shows a sharp decrease, a strong indication for the onset of global diffusive motion. This proposal aims at extending these measurements to higher temperatures. Our main purpose is to determine the barrier for thermal diffusion by monitoring the motion of diamagnetic Mu+ species well above room temperature where the center is diffusively mobile in these oxides. Current proposal is an extension of RB1110332 and a part of B. Baker's PhD project.