Effect of Yb3+ ions content on crystallization of NaF–CaF2–Al2O3–SiO2 oxyfluoride glasses
Effect of Yb3+ ions content on crystallization of NaF–CaF2–Al2O3–SiO2 oxyfluoride glasses
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DOI：
10.1016/j.matlet.2011.11.044
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发表时间：
2012-02
影响因子：
3
通讯作者：
A. Lu;W. Long;Yuan-Chieh Chen
中科院分区：
文献类型：
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作者：
A. Lu;W. Long;Yuan-Chieh Chen
利用差示扫描量热仪(DSC)、X射线衍射仪(X射线衍射仪)和透射电子显微镜(TEM)对掺Yb3+的NaF-CaF2-Al_2O_3-SiO_2系微晶玻璃的晶化、物相和颗粒分布进行了研究和测定。用Ozawa方程求出了表观活化能Ea。结果表明，随着Yb3+含量的增加，析晶能力增加，说明Yb3+离子的引入增强了玻璃的析晶能力，促进了晶相的析出。析晶过程中析出Ca0.8Yb0.2F2.2(0.8CaF2·0.2YbF3)固溶体相，部分Yb3+离子取代CaF2中的钙离子，Ca0.8Yb0.2F2.2微晶均匀分布在微晶玻璃结构中，尺寸约为10-20 nm。
The crystallization, phase and grain distribution in Yb3+ions doped NaF–CaF2–Al2O3–SiO2glass–ceramics were studied and determined by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Apparent activation energy Eawas obtained by Ozawa equation. The result shows that, Eadecreases with increasing of Yb3+content, which indicates that introducing Yb3+ions enhances the crystallization ability of the glass and promotes the precipitation of crystal phase from the glass. During the crystallization, Ca0.8Yb0.2F2.2(0.8CaF2·0.2YbF3) solid solution phase precipitates from the glasses, which is considered as partial Yb3+ions taking the place of Ca2+in CaF2.The spherical Ca0.8Yb0.2F2.2micro-crystal grains with about 10–20nm size distribute uniformly in the structure of the glass–ceramics.