Abstract
The Na + ions in the solid electrolyte β″alumina (Na +-β″-Al 2O 3) have been exchanged with Pr 3+ ions. The Pr 3+ ion has been used as an optical and magnetic probe to investigate the local structure within the conduction planes of this oxide. With this aim, optical spectra and susceptibility measurements have been carried out. Both fluorescence and excitation spectra, related to the 3P o→ 3F 2, 3H 4 transitions, have been recorded on single crystals. The magnetic susceptibility shows temperature-independent paramagnetism at low temperatures. The physical properties have been interpreted with the help of ligand-field calculations by applying the angular overlap model. It has been deduced that the Pr 3+ ions occupy mostly the eightfold-coordinated mid-oxygen (mO) sites.
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