The changes in the defect structure of ZnO particles that take place during the grinding of pure ZnO powders and mixtures of ZnO–SnO2 and ZnO–TiO2 powders were reported. The qualitative differences in the electron paramagnetic resonance spectra for different specimens were considered within the context of the hyper-rapid high-temperature spikes created in ZnO particles during mechanical treatment. The thermal spikes caused the defect structure to undergo annealing. The spike duration of the hyper-rapid thermal defects annealing was dependent upon the heat conductivity of the ZnO particle environment.

Hyper-Rapid Thermal Defect Annealing during Grinding of ZnO Powders. Kakazey, M.G., Vlasova, M., Dominguez-Patiño, M., Dominguez-Patiño, G., Gonzalez-Rodriguez, G., Salazar-Hernandez, B.: Journal of Applied Physics, 2002, 92[9], 5566-8