| Li_2O-Ta_2O_5-GeO_2系统玻璃的EXAFS研究 |
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| 引用本文： | 何卓然,叶巧明.Li_2O-Ta_2O_5-GeO_2系统玻璃的EXAFS研究[J].西南科技大学学报,1993(3). |
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| 作者姓名： | 何卓然 叶巧明 |
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| 作者单位： | 四川建材学院材料科学与工程系
(何卓然),四川建材学院材料科学与工程系(叶巧明) |
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| 摘 要： | 本文测量了xLi_2O·0.15Ta__2O_5·(0.85-x)GeO_2三元系统玻璃的GeK边和TaL边的EXAFS谱。利用计算机进行曲线拟合得出了玻璃中CeO_4]四面体和KeO_6]八面体的百分含量,所得结果表明:该三元系统存在着“锗反常”现象。随着Li_2O的加入,玻璃中GeO_4]部分转变为GeO_6]。当 Li_2O含量为25mol％时,GeO_6]含量达到极大值.即GeO_6]为25％,当继续加入Li_2O时非桥氧的GeO_4]增加,而下稳定的GeO_6]减少。钽L边的EXAFS研究表明:钽在玻璃中主要以GeO_6]八面体存在,T-O键长为1.98A·左右。同时探讨了玻璃的结构模型。
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| 关 键 词： | 玻璃 EXAFS 锗反常 结构模型 |
The study on EXAFS Spectra of Glass in the system of LiO-Ta_2O_5-GeO_2 |
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| He Zhuoran Ye Qiaoming.The study on EXAFS Spectra of Glass in the system of LiO-Ta_2O_5-GeO_2[J].Journal of Southwest University of Science and Technology,1993(3). |
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| Authors: | He Zhuoran Ye Qiaoming |
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| Institution: | Sichuan Institute of Building Materials |
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| Abstract: | The EXAFS spectra of Gek and TaLI in xLi2O. 0. 15Ta2O5. (0. 85-x) GeO2 ternary system was studied. The percents of GeO4 and GeO6 were gained by means of curve fitting in the computer. The results show that there is"Ge anomaly" in ternary system. The part GeO4 is changed into GeO5 with increasing Li2O in glass. GeO6 contents reach the miximum in the system with 25mol% Li2O. or the percents of Geo6 is equal to 25%. Nonbridge oxygen GeO4 increases and unstready GeO6 decreases with adding Li2O continually. The study in the spectra of TaLI show that the coodination of Ta atom is 6. Ta -O distance is about 1. 98A . At the Same time, the strulctural model of glass is disscussed. |
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| Keywords: | glass EXAFS Ge anomaly structural model |
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