SPECTROSCOPIC STUDIES OF HIGH-TEMPERATURE PROCESSES IN OXIDES

Spectroscopic studies can provide important information on physico-che mical processes in solids, like, e.g., order-disorder processes, the p oint defect structure and local defect arrangements, and heterogeneous as well as homogeneous chemical reactions of solids. Results will be reported relating to these topics from experiments that have been perf ormed under in situ conditions, i.e. at high temperatures and under de fined conditions of oxygen partial pressures. The examples have been c hosen from high-temperature studies using optical spectroscopy and Mos sbauer spectroscopy.