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The Nasicon-type phosphate CuZr 2 (PO 4 ) 3 exhibits two fluorescences occurring in the violet and green regions. They are assigned to two different centres: the violet one to isolated Cu + and the green one to Cu + -Cu + pairs occupying the same site. These assignments are in agreement with previous structural investigations using X-ray, neutron and EXAFS measurements and provide information about the location of copper ions in the crystal. A third luminescence is detected in the blue range at low temperature. The origin of this fast strong emission is not clearly established. It could be due to Cu + -Cu 0 pairs in the M(1) site.
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Boutinaud et al. (1992) studied this question.
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