BaO-ZnO-La_2O_3-B_2O_3系统玻璃配位状态和网络结构

Coordination and Glass Network Structure of BaO-ZnO-La 2O 3-B 2O 3 System

ｎＯ－Ｌａ２Ｏ３－Ｂ２Ｏ３玻璃具有高折射率、低色散的特点。但该系统玻璃容易析晶失透，常需加入高价金属氧化物，如Ｖ２Ｏ５，Ｎｂ２Ｏ５等。本实验通过加入ＢａＯ，提高了该系统的玻璃形成能力。研究表明，加入少量ＢａＯ，使玻璃网络中［ＢＯ４］和［ＺｎＯ４］数量上升，非桥氧数量下降，玻璃网络趋于稳定，玻璃形成能力提高。实验表明，在ＢａＯ－ＺｎＯ－Ｌａ２Ｏ３－Ｂ２Ｏ３玻璃网络中Ｚｎ２＋离子的配位与ＢａＯ加入有密切关系，可以［ＺｎＯ４］四面体形式进入玻璃网络。

ZnO-La 2O 3-B 2O 3 system is very important in the manufacturing optical glass due to its high refraction and low dispersion. For its heavy devitrification, some metal oxides such as V 2O 5,Nb 2O 5 have to added, but they cause glass coloring and lower glass transparency. BaO has the advantage to avoid devitrification while not contaminating glass. It shows that small amount of BaO addition can increase BO 4 and ZnO 4 in the glass network, decrease the amount of non-bridging oxygen. Therefore small amount of BaO additon can make the glass network more stable and uplift the glass formation ability of the system. Meanwhile, the research on coordination status of Zn 2+ in the paper shows that the coordination of Zn 2+ depends on the amount of BaO addition.