Ge_(20)Se_(80-x)Te_(x)玻璃网络结构演变及理论带隙-玻璃性能评价  

Structural evolution of Ge_(20)Se_(80-x)Te_(x)glass networks and assessment of glass properties by theoretical bandgap

作　　者：夏克伦 管永年 顾杰荣 贾光 仵苗苗 沈祥 刘自军[1,2] Xia Ke-Lun;Guan Yong-Nian;Gu Jie-Rong;Jia Guang;Wu Miao-Miao;Shen Xiang;Liu Zi-Jun(Ningbo Institute of Oceanography,Ningbo 315832,China;Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波海洋研究院,宁波315832 [2]宁波大学,全省先进光功能材料及器件重点实验室,宁波315211

出　　处：《物理学报》2024年第14期185-192,共8页Acta Physica Sinica

基　　金：国家自然科学基金区域创新发展联合基金项目(批准号:U21A2056);国家自然科学基金(批准号:61975086,62075110)资助的课题.

摘　　要：开发特殊性能红外材料是目前提升红外光学系统性能的关键,硫系玻璃作为组分-性能可调的红外材料无疑成为了热门选项.Se基与Te基玻璃涵盖中波、长波红外窗口,是最典型的红外器件应用材料之一,通过对Ge_(20)Se_(80–x)Te_(x)玻璃体系的结构与性能分析,阐述了Te含量对该玻璃体系结构与性能演变的规律.随着Te含量的增大,玻璃转变温度(Tg)受网络结构及平均键能的影响先升高后降低,密度与折射率近似线性的梯度增高,阿贝数逐渐增大,而维氏硬度几乎不随Te含量的变化而变化,断裂韧性随Te含量的增大而降低.针对平均配位数无法评价两种及以上同族元素组成的玻璃体系问题,成功建立了理论带隙-玻璃性能评价体系,并对Ge_(20)Se_(80–x)Te_(x)玻璃体系的密度、折射率、阿贝数、断裂韧性等参数与理论带隙建立了函数关系,该体系可用于快速评估玻璃组分与性能.Infrared imaging systems are being updated towards greater performance as well as lighter and smaller devices.Developing infrared materials with special properties is a critical for enhancing the performance of optical systems as well as miniaturizing devices.Chalcogenide glass becomes a popular option for advanced IR materials due to its component-property tunability.Se—based glasses such as Ge_(33)As_(12)Se_(55),Ge_(10)As_(40)Se_(50),and As_(40)Se_(60),which completely cover the mid-and long-wave infrared windows,are the most typical materials used in infrared equipment.However,these classical materials can no longer meet the requirements of highperformance imaging systems,and adding more elements such as Te,Ga,Sb,and Ag to enhance the performance is a reliable way to solve this problem.By analysing the structure and properties of the Ge_(20)Se_(80–x)Te_(x) glass system,the law of its structure and properties evolving with Te content is illustrated.The obtained typical results are shown below.With the increase of Te content,the glass transition temperature(Tg)increases and then decreases,which is caused by the network structure and the average bond energy;the density and refractive index increase in an approximately linear gradient;the Abbe number gradually increases,while the Vickers hardness hardly changes with Te content;the fracture toughness decreases with the Te content increasing.Aiming at the problem that the average coordination number is unable to evaluate the glass systems composed of two or more elements from the same main group,a theoretical bandgap-glass property evaluation system is successfully established.The functional relationships among parameters such as density,refractive index,Abbe number,and fracture toughness,and theoretical band gap are established for Ge_(20)Se_(80–x)Te_(x) glass system as shown in the summary figure,which can be used to rapidly evaluate the glass components and properties.

关 键 词：红外材料 硫系玻璃 理论带隙 玻璃性能 

分 类 号：TQ171.1[化学工程—玻璃工业]