ESR AND OPTICAL SPECTROSCOPY OF CE-3+ - BETA''-ALUMINA

ESR and optical absorption spectroscopy are reported for Ce3+ doped β″-alumina and codoped Ce3+Nd3+-β″-alumina. The doping was achieved by ion exchange techniques. The spectra indicate that the Ce3+ ions are found at the mid-oxygen sites in the β″-alumina conduction plane. The g-tensor values were found to be gx = 2.58, gy = 2.15, and gz = 0.85. A small second site occupation (less than 1%) is observed from Ce3+ ions located in the Beevers-Ross sites. In the codoped crystals, it is shown that the site occupations of Ce3+ and Nd3+ ions are not changed when both of these ions are present in the same crystal, an important consideration in energy transfer studies. © 1990.