Abstract
We have prepared polycrystalline alloys x (ErF 3 ):(100 − x )(PbF 2 ), x = 1, 10. A comparison of their low temperature absorption and emission spectra with the respective spectra of transparent oxyfluoride glass-ceramics, 32(SiO 2 )9(AlO 1.5 )31.5(CdF 2 )18.5(PbF 2 )5.5(ZnF 2 ):3.5(ErF 3 ) mol%, indicates that the nano-crystalline phase in this glass-ceramic is Er 3+ -doped PbF 2 .
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