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通过熔融-淬冷的方法制备Ge30Se70硫系玻璃块状试样,利用XRD判定所制试样的非晶态程度,采用DSC热分析方法测定该试样的玻璃化转变温度Tg和起始析晶温度Tx,通过VFT方程拟合法确定试样的动力学理想玻璃化转变温度T0,采取分段加热法分析Ge30Se70玻璃试样和同成分晶体试样在设定温度范围内的比热容.通过计算出的比热容拟合出Ge30Se70玻璃和晶体的比热容方程,即cp,l=0.0002T+0.3337和cp,c=0.00006T+0.4594.Ge30Se70试样的Tg和T0分别为590和581 K,且Tg随着升温速率R的增大而增加.在低于玻璃转化温度前时,Ge30Se70玻璃试样的平均比热容约为11.8 J/(mol·K),红外透过率约为60%,红外性能良好.获得Ge30Se70玻璃的约化转变温度Trg介于0.5~0.667之间,形核率极低,表明Ge30Se70玻璃的成玻能力良好.
Ge30Se70 chalcogenide glass block sample was prepared by melt-quenching method. The amorphous state of the prepared sample was determined by XRD. The glass transition temperature Tg and the initial crystallization of the sample were determined by DSC thermal analysis Temperature Tx, the dynamic ideal glass transition temperature T0 of the sample was determined by the VFT equation fitting method, and the specific heat capacity of the Ge30Se70 glass sample and the same composition crystal sample in the set temperature range was analyzed by the piecewise heating method. The specific heat capacity of Ge30Se70 glass and crystal was fitted by the specific heat capacity, that is, cp, l = 0.0002T + 0.3337 and cp, c = 0.00006T + 0.4594. The Tg and T0 of Ge30Se70 samples were 590 and 581 K, Rate R. The average specific heat capacity of Ge30Se70 glass sample is about 11.8 J / mol · K before the glass transition temperature, the infrared transmittance is about 60%, and the infrared performance is good.After Ge30Se70 The glass transition temperature Trg between 0.5 ~ 0.667, the nucleation rate is very low, indicating that Ge30Se70 glass into the glass of good ability.