Abstract
Detailed emission and excitation spectra and decay measurements of the luminescence of the system Mg 4Ta 2− x Nb x O 9 are reported. In Mg 4Ta 2O 9 a new emission and excitation band at relatively low energy has been found. In the samples with a high niobium concentration ( x ⩾ 1) a new weak orange emission has been observed upon long-wavelength uv excitation. A new interpretation of the results, based on the occurrence of different niobate or tantalate centers, is presented.
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