Transparent glass ceramics were prepared from the phosphosilicate system by melt-quenching devitrification (MQD) method, i.e., nanocrystals spontaneously form during cooling of the melts. Introduction of 2.5 wt.%Yb2O3 and 0.5 wt.%Er2O3 into the glass melt induced the change of type and concentration of crystals. The comparison of rheological and thermodynamic properties of both undoped and Yb3+/Er3+doped melts showed that addition of Yb3+/Er3+oxides caused increase of liquid fragility, and degree of medium-range order. In addition, the thermodynamic barriers for nucleationΔG*as a function of reduced temperature T/Tm were cal-culated with an assumption of wetting angleθ=90o, Yb3+/Er3+doped melt tended to firstly nucleate as compared to undoped melt at small undercooling.
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