Dy3+/Tb3+共掺ABS系统磁光玻璃的析晶动力学研究

摘要

In this paper,the magneto-optic glass of Tb2O3 doped ABS system was prepared by high temperature melting cooling process.The crystallization behavior and microstructure of Dy3+/Tb3+ doped aluminoborosilicate (ABS) magneto-optical glasses was investigated using DSC,XRD,SEM and FT-IR.With the help of the Kissinger and Augis-Bennett equation,the crystallization kinetics of the precipitates and the kinetics of the phase transition of the glass were analyzed.The results showed that the Al3Tb(BO3)4 and TbBO3 crystals are precipitated from the glass matrix when being heated at 846.8 ℃ and 898.6 ℃,respectively.The crystallization activation energy of the two crystalline phases (Al3Tb(BO3)4 and TbBO3) was Ep1=972.3 kJ/mol and Ep2=532.79 kJ/mol,respectively.The average crystallization index was 0.5 and 0.8,respectively.By applying the Kissinger equation to the parameterized crystallization behavior,the calculated phase transition activation energy was determined to be 413.22 kJ/mol.By the physical properties of the magneto-optic glass crystallization,the density and expansion coefficient of the matrix glass are increased.%通过高温熔融冷却工艺制备稀土Tb2O3掺杂ABS(铝硼硅)系统磁光玻璃,采用差示扫描量热分析、X射线衍射分析、红外光谱分析、扫描电子显微镜分析,并借助Kissinger和Augis-Bennett方程,探讨了热处理制度、玻璃析晶行为和显微结构的关系.测试分析了析出晶体的析晶动力学和玻璃相转变动力学,同时对所制备磁光玻璃的膨胀系数、密度等物理性能进行了测试分析.结果表明:当在846.8 ℃和898.6 ℃下进行热处理时,析出的晶体分别为Al3Tb(BO3)4和TbBO3;析晶活化能分别为Ep1=972.3 kJ/mol和Ep2=532.79 kJ/mol;平均析晶指数m1=0.5,m2=0.8,表明该系统磁光玻璃中产生的晶体为表面成核,析晶从试样表面一维空间生长,析晶是由扩散过程控制的;通过Kissinger方程,计算出的相转变活化能Eg为413.22 kJ/mol.通过对磁光玻璃析晶前后的物理性质研究发现,析晶后基体玻璃的密度和膨胀系数都有所增大.