中文摘要：

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.

英文摘要：

Chalcogenide glass is an ideal infrared wave-transparent material,and it has the advantages of low cost,high production efficiency,high glass transition temperature and good mechanical properties,etc..It is a candidate material for thermal imaging system.The block sample of Ge30Se70 chalcogenide glass was prepared by the method of the melt-quenched.In this work,XRD was used to determine whether the sample was amorphous material.With the DSC thermal analysis method,the glass transition temperature Tgand the initial crystallization temperature Txof the sample were measured.The dynamics ideal glass transition temperature T0 of the specimen was fitted by VFT equation.The method of segmented step heating is used to analyze the calorific value for the glass and congruent crystal of Ge30Se70 sample in setting temperature range.Then from the calculated calorific values of the glass and crystalline samples,the specific heat capacity relationships were obtained,i.e.,cp,l=0.0002 T ＋0.3337 and cp,c=0.00006T＋0.4594.The results show that Tgand T0 of Ge30Se70sample is 590 and 581 K,respectively.And Tgwill increase with the increasing of the heating rate R.The average value of the specific heat capacity of the Ge30Se70 glass sample is about 11.8 J/（mol·K） below the glass transition temperature.The infrared transmittance is about 60% indicating that the infrared performance is good.The glass reduced temperature Trgof Ge30Se70 sample is between 0.5~0.667,and the nucleation rate is very low,which indicates that the glass forming ability of Ge30Se70 glass is good.