Structural characterisation of tin fluorophosphate glasses doped with Er2O3
Structural characterisation of tin fluorophosphate glasses doped with Er2O3
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DOI：
10.13036/17533562.57.1.069
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发表时间：
2016-02-01
影响因子：
0.6
通讯作者：
Kovalskiy, A.
中科院分区：
文献类型：
--
作者：
Trimble, J.;Golovchak, R.;Kovalskiy, A.
用EXAFS和共焦拉曼显微术研究了50 SnF（2）中心点（20-x）SnO中心点30 P（2）O（5）中心点xEr（2）O（3）（x=0，0.1，0.25）玻璃。EXAFS数据显示，在未掺杂的玻璃和Er掺杂的玻璃样品中，Sn到O的平均配位为1.5。在掺Er_2 O_3的玻璃中，Er的第一配位球有9个F原子相邻，平均键长为2.292 +/- 0.005埃，表明Er优先与F键合。拉曼光谱清楚地表明，正磷酸盐Q（0）单元的出现，添加的Er 2 O3。Er溶解度的饱和被发现是在0.25和0.5摩尔%的Er 2 O3之间。还观察到玻璃转变温度从未掺杂玻璃中的类似80摄氏度增加到掺杂0.25mol%Er2 O3的样品中的类似87摄氏度。该过程伴随着结晶和玻璃化转变温度之间的差异的增加，这通常与玻璃的热稳定性的改善有关。
EXAFS and confocal Raman microscopy have been used to study 50SnF(2)center dot(20-x)SnO center dot 30P(2)O(5)center dot xEr(2)O(3) (x=0, 0.1, 0.25) glasses. EXAFS data reveal an average coordination of Sn to O of 1.5 in both undoped glass and Er-doped glass samples. The first coordination sphere of Er in glasses doped with Er2O3 was found to have 9 F atom neighbours at an average bond length of 2.292 +/- 0.005 angstrom, indicating that Er preferentially bonds with F. Raman spectra clearly show the emergence of orthophosphate Q(0) units on addition of Er2O3. The saturation of Er solubility is found to be between 0.25 and 0.5 mol% Er2O3. An increase of the glass transition temperature from similar to 80 degrees C in undoped glass to similar to 87 degrees C in samples doped with 0.25 mol% Er2O3 was also observed. This process is accompanied by an increase in the difference between the crystallisation and glass transition temperatures, which is usually associated with improved thermal stability of the glass.