The crystallization of (Pb, Yb, Er)Fx nano particles from glasses with the composition 20 SiO2∙13.5 B2O3∙6 Al2O3∙10 PbO∙6.6 CdO 20 PbF2∙13.3 CdF2∙10 YbF3∙0.5 ErF3

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