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Optical and electron-spin resonance measurements, at 78 and 300 °K, of copper-doped lead molybdate (PbMoO4) single crystals, with and without gadolinium trace impurity, have shown that: (i) Gd3+ occupies the Pb2+ substitutional site, (ii) copper enters the lattice as both Cu2+ and Cu+ in Gd-free crystals but mostly as Cu+ in Gd-doped crystals, and (iii) Cu2+ occupies several distinct sites, none of which has the S4 symmetry of the sites of either Pb2+ or Mo6+.
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G. Hossein Azarbayejani (1972) studied this question.
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