稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2015年
2期
189-194
,共6页
鲁强%刘树江%曹万强%赵萍
魯彊%劉樹江%曹萬彊%趙萍
로강%류수강%조만강%조평
crystallization%transparent glass ceramics%Yb3+/Er3+ions%rare earths
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.
