【作者】 杨钢锋； 张勤远； 印冰； 姜中宏；

【Author】 YANG Gang-feng, ZHANG Qin-yuan , YIN Bing, JIANG Thong-hong (Key Lab of Specially Functional Materials, Ministry of Education, and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China)

【机构】 特种功能材料教育部重点实验室华南理工大学光通信材料研究所；

【摘要】 研究了不同碱金属离子的碲酸盐玻璃在较低温度范围内的粘度曲线,并采用麦夸特优化算法对曲线进行拟合。结果表明采用Fulcher方程和Williams方程都可以得到很好的拟合结果,并且两者参数之间存在一定的内部联系。利用得到的参数可计算玻璃中自由体积分数随温度的变化情况,并可计算得到的粘度变化速率。研究表明,含Li+离子的样品相对于含Na+离子和K+离子的样品来说其粘度变化速率较小。根据玻璃形成动力学理论,采用粘度变化速率表征玻璃的抗析晶性能更具准确性和科学意义。更多还原

【Abstract】 The viscosities of tellurite glasses containing different alkali metals were studied, and the curves were fitting by Levenberg-Marquardt method. The result shows the fitting results according to the Fulcher equation and Williams equation are almost the same, and the parameters of the both have intrinsical relationship. The temperature dependence of the free volumes fraction and the rate of viscosity change can be calculated according to the obtained parameters. It is found that rate of TL is smaller than that of TN and TK. According to the kinetics theory of glass forming, the rate of viscosity change is the better criterions used to evaluate the against crystallization property of glasses.更多还原