二价Ba^(2+)、Pb^(2+)和四价Ti^(4+)在硼硅酸盐玻璃系统中对Li^+/Na^+离子交换的影响  

EFFECTS OF Ba^(2+)、Pb^(2+) AND Ti^(4+) IONS ON EXCHANGING Na^(4+) FOR Li^+ IN BOROSILICATE GLASSES

作　　者：王耀祥[1] 马成义[1] 章兴龙[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,材料科学研究室,西安710068

出　　处：《光子学报》2000年第3期260-263,共4页Acta Photonica Sinica

摘　　要：本文讨论了在硼硅酸盐玻璃系统中引入二价 Ba2 + 、Pb2 + 和四价 Ti4+ 后 ,由于 Pb2 + 和Ti4+ 配位结构的变化 ,引起 Pb2 + 、Ti4+ 场强及其与 O2 -离子间距的变化 ,对 Li+ /Na+ 离子交换产生影响 ,从而改变折射率差值 (ΔN )和折射率分布 .In this paper,it is discussed the effects of Ba 2+ 、Pb 2+ and Ti 4+ ions on exchanging Na + for Li + in borosiliate glasses.Because of the high polarizability of Pb 2+ 、Pb 2+ ions in eight fold coordination have deformed,this cause the high field strength and the distance between O 2- and Pb 2+ dwindled.In glasses,Ti 4+ ions can act both as network formers and network modifiers.The concentration of the [TiO 4] tetrahedra decreased and that of the [TiO 6] octahedra increased with increasing alkali metal oxide content.Especially when B 2O 3 and Al 2O 3 lie in this glass,this caused the lower field strength of Ti 4+ then that of Pb 2+ ,but the field strength is still higher than that of Ba 2+ ,hence the coulombic forces between Na + and Li + ions have been degraded.Furthermore the ionic mobilities of Li + improved.So they can influence the exchange of Na + for Li +.One can control and alter radial gradient index profile and increase the refractive index difference by introducing high field strength ions Pb 2+ and Ti 4+ in borosiliate glasses system.

关 键 词：硼硅酸盐玻璃 径向梯度折射率 离子交换 

分 类 号：TQ171.718[化学工程—玻璃工业]