Abstract
The optical absorption spectra of several Co-doped oxide systems (MgO, ZnO, aluminum spinel, yttrium gallium garnet, and germanium garnets) have been studied at room temperature, 78°, and 4.2°K, and analyzed using the formalism of the crystal-field theory. Oscillator strengths and cubic-field parameters have been derived. The observed data for tetrahedrally coordinated Co2+ are found to agree satisfactorily with the theoretical predictions. The effect of the spin-orbit coupling on the cubic-field terms has been calculated and the predicted splitting compared with the structure of the absorption bands of MgO:Co and ZnO:Co. The optical absorption properties of MgO:Co and ZnO:Co are used to infer the site symmetry of Co2+ in systems (spinels and garnets) in which the cations occupy sites of different symmetry.
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