BaO-Ga_2O_3-GeO_2玻璃的析晶机理研究  

Study on Crystallization Mechanism of Barium Gallogermanate Glass

作　　者：郭艳春[1] 王衍行[2] 

机构地区：[1]中国电子科技集团公司第四十四研究所,重庆400060 [2]中国建筑材料科学研究总院,北京100024

出　　处：《武汉理工大学学报》2013年第3期7-10,25,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(60808024)

摘　　要：钡镓锗玻璃是一种性能优异的中红外透过材料,而较差的机械性能严重制约了其应用。研究了钡镓锗玻璃的析晶动力学及其微晶化行为,阐明了析晶机理,为制备透明钡镓锗微晶玻璃提供理论指导。采用非等温方法研究了钡镓锗玻璃的析晶动力学,利用Kissinger模型,计算出析晶活化能Ec,两个析晶峰对应的Ec1=318kJ/mol和Ec2=515kJ/mol。通过Augis-Bennett方程获得了两个析晶峰对应的析晶指数,n-≈3。当低于1 187K(Tc2)进行晶化处理时,钡镓锗微晶玻璃中仅析出ZrO2晶体;随着晶化温度的升高,玻璃的热能持续增大,Ge2Al6O13晶体开始从母体玻璃中孕育并长大。Barium gallogermanate glass is a good candidate infrared material. However, the poor mechanical proper- ties restrict its application. The crystallization kinetics and mechanism of barium gallogermanate glass were studied to fabricate transparent geramanate glass ceramics. The activation energies of crystallization obtained from Kissinger model of the first exothermal peak and the second exothermal peak of barium gallogermanate glass are 318 kJ/mol and 515 kJ/mol, respectively. The crystallization exponents of the both peaks are approximately 3, indicating the volume crystallization during its amorphous to crystalline transformation. ZrO2 crystalline forms from mother glasses when crys- tallization temperature is lower than 1 187 K （To2）. With increasing of crystallization temperature, Ge2Al5O13 appears owing to higher thermal energy in barium gallogermanate glass.

关 键 词：钡镓锗玻璃 红外材料 析晶动力学 显微结构 析晶机理 

分 类 号：TQ171.73[化学工程—玻璃工业]