Ge_4Se_(96)红外玻璃的热力学性能  

Characteristic Temperatures and Thermodynamic Calculation of Ge_4Se_(96) Glass

作　　者：刘振亭 许军锋[1,2] 王亚玲[2] 坚增运 刘江南[1,2] Liu Zhenting;Xu Junfeng;Wang Yaling;Jian Zengyun;Liu Jiangnan(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西安工业大学光电功能材料与器件陕西省重点实验室,陕西西安710021

出　　处：《稀有金属材料与工程》2019年第3期810-814,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51671151;51401156;51371133);国家重点基础研究发展计划("973"计划)(2013CB632904);陕西省自然基金项目(2016KJXX-87)

摘　　要：通过融熔-淬冷法制备了Ge_4Se_(96)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Ge_4Se_(96)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Ge_4Se_(96)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,Ge_4Se_(96)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)/10~3,Kauzmann温度T_k=233.5 K。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(Cp)was studied,Cp of Ge4Se96 glass was then measured,and the relation of Cpl 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℃;the average thermal expansion coefficient isΔL/L0=(0.0557T-1.7576)/10^3.With the result of Cp,the Gibbs energy and the entropy curves were calculated.The Kauzmann temperature can be determined to be Tk=233.5 K.

关 键 词：硒基玻璃 比热 特征温度 热力学计算 

分 类 号：TG132.5[一般工业技术—材料科学与工程]