【摘要】 通过融熔-淬冷法制备了Ge₄Se₉₆硫系玻璃块状试样,利用等温步阶方法（stepwise method）测定其DSC曲线,并采用新算法对Ge₄Se₉₆玻璃的比热进行了分析计算。通过比热算出Gibbs自由能变化△G和熵变△S,得到了△G和△S随温度变化的曲线,确定了Kauzmann温度Tk。采用热机械分析（TMA）确定了Ge₄Se₉₆玻璃的应变点、退火点、玻璃转变点、屈服点和软化点的特征温度。结果表明,Ge₄Se₉₆的玻璃化转变温度Tg是52℃,平均热膨胀系数是△L/L0=（0.0557T-1.7576）/10³,Kauzmann温度T_k=233.5 K。更多还原

【Abstract】 Se-based glass is an important system on account of its excellence glass formation ability.The Ge₄Se₉₆ glass was prepared by a melt quenched method.A stepwise method for measuring specific heat（C_p）was studied,C_p of Ge₄Se₉₆ glass was then measured,and the relation of C_p^l and temperature T for undercooled liquid was determined.The characteristic temperatures（the strain point,annealing point,glass transition point,yielding point,and soften point）were determined by thermal analysis.The results show that the glass transition point of Ge₄Se₉₆ is 52°C;the average thermal expansion coefficient isΔL/L₀=（0.0557T-1.7576）/10³.With the result of C_p,the Gibbs energy and the entropy curves were calculated.The Kauzmann temperature can be determined to be T_k=233.5 K.更多还原