Abstract
Time-resolved luminescence spectra of Mg 2+ -stabilized β″-alumina crystals, containing some traces of chromium at aluminium sites in the spinel block, have been taken at several temperatures between 4.2 and 300 K. The spectra are attributed to the 2 E- 4 A 2 transition of Cr 3+ ions in octahedral sites of the host matrix. The emissions from centres characterized by different lifetimes have been isolated. The results are discussed in terms of static disorder and compared with recent results obtained in sodium β-alumina: Cr 3+ . The luminescence spectra are in agreement with the assumption of a random distribution of Mg 2+ ions over the tetrahedral sites within the spinel block.
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