Na_2O-TeO_2系统玻璃形成液体脆性的研究

FRAGILITY OF GLASS FORMING LIQUID IN THE Na_2O-TeO_2 SYSTEM

通过测量Na2 O -TeO2 系统玻璃转化区的热容曲线 ,对该系统不同成分玻璃形成液体的热力学和动力学脆性进行研究。结果表明 :该系统玻璃形成液体从热力学和动力学综合看脆性程度介于强弱之间 ,为中性偏脆性。随着氧化钠含量的升高 ,玻璃形成液体的脆性增强。用Kissinger方程和Ritland -Bartanev方程 ,得到的在玻璃转变区的结构松弛激活能十分接近。

The heat capacity curves in the glass transition region of glasses in the Na 2O-TeO 2 system were measured. The thermodynamic fragility, kinetic fragility, and the effect of composition on the fragility of the glass forming liquid in this system were investigated. Results show that the degree of fragile of the glass forming liquid in the system is in medium state and slightly more fragile from the viewpoint of thermodynamic fragility and kinetic fragility. As the increase of Na 2O content, the fragility of glass forming liquid increases gradually. The structure relaxation energy of glass in the glass transition region determined from the Kissinger equation and Ritland-Bartanev are very close. The calculated fragility parameter of the glass forming liquids in the system, including the thermodynamic and kinetic variables, also indicates the same result that the glass forming liquids in this system are in the category of intermediate or fragile liquid.