Influence of rare earth oxides on the non-isothermal crystallization of phosphosilicate melts during cooling

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• 作者：Shujiang Liu ; Zhitao Shan ; Guizhen Fu ; Yuanzheng Yue
• 关键词：Phosphosilicate glasses ; Transparent glass ceramics ; Melt-crystallization kinetics
• 刊名：Journal of Non-Crystalline Solids
• 出版年：1 February, 2014
• 年：2014
• 卷：385
• 期：Complete
• 页码：75-80
• 全文大小：1019 K

文摘

We report a detailed calorimetric study concerning the influence of Yb₂O₃ and Er₂O₃ on the non-isothermal crystallization in phosphosilicate melts. The results show that Yb^3 +/Er^3 + ions promote the Zn₂SiO₄ crystal formation, but suppress the Na₃PO₄ and AlPO₄ formation during cooling. The non-isothermal melt-crystallization kinetics can be well described by the Avrami model. The activation energy E_e of crystallization in both the undoped and Yb^3 +/Er^3 + codoped samples during cooling is determined using the differential iso-conversional method of Friedman. The E_e value decreases with crystallinity (胃 = 0.1 to 0.9) during cooling for both glasses, and introducing Yb₂O₃ and Er₂O₃ leads to an increase in energy barrier of crystallization upon cooling.