Abstract
The luminescence spectra of Mn 2+ in β alumina prepared by diffusion at high temperature and by exchange in molten MnCl 2 at moderate temperatures are compared. High temperature diffusion distributes Mn 2+ over the tetrahedral sites of the spinel block and gives rise to a green emission at 510 nm. Molten salt exchange places Mn 2+ on the easily exchangeable Na + site and generates a characteristic orange (590 nm) emission.
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