不同Pr_2O_3含量硼铝硅酸盐玻璃析晶性能研究  

Crystallization of Pr_2O_3-Doped Boro-Alumino-Silicate Glasses

作　　者：张焱[1] 陆春华[1] 倪亚茹[1] 许仲梓[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《中国稀土学报》2007年第5期578-583,共6页Journal of the Chinese Society of Rare Earths

基　　金：教育部跨世纪优秀人才项目;江苏省"333工程"项目;江苏省自然科学基金项目(BK2004121)资助

摘　　要：采用高温熔融法制备了不同Pr2O3掺量的SiO2-B2O3-Al2O3-BaO玻璃,利用DTA,XRD,TEM以及IR等手段研究了稀土氧化物掺入量对玻璃热稳定性、析晶行为、玻璃结构的影响。结果表明:当稀土掺入量逐渐增加时,玻璃的热稳定性递减;在高于Tx的温度下进行热处理,玻璃析晶产物逐渐由PrAl2.03(B4O10)O0.54向PrBO3转变;Pr3+填充在[SiO4],[BO4]和[BO3]等结构单元组成的混合网络的空隙之中,网络中间离子Al3+随稀土氧化物的增加,发生从网络变性离子向网络形成离子的转变。Pr2O3-doped SiO2-B2O3-Al2O3-BaO were prepared by melting method.The effect of rare earth oxide content on the glass thermo-stability was analyzed through differential thermal analysis technique.XRD,TEM/EDS and FT-IR were used to characterize the crystals after heat-treatment near Tx（the temperature at the beginning of exothermic peak）.The results showed that with increasing of Pr2O3 thermo-stability of glasses decreased.The crystal phase changed from PrAl2.03（B4O10）O0.54 to PrBO3.Pr3＋ filled into the spacing of glass network structure which was composed of , and .The role of Al^3＋ changed from the net-breaker to net-former with increasing of Pr2O3.

关 键 词：玻璃 析晶 热稳定性 稀土 

分 类 号：TQ171[化学工程—玻璃工业] O794[化学工程—硅酸盐工业]