铌硼酸盐玻璃熔融态的高温振动光谱

High Temperature Vibration Spectra of Nioboborate Glass Melts

本文首次采用高温Raman光谱和高温红外光谱研究了铌硼酸盐玻璃熔融态的结构。在硼玻璃中,化学键B~Ⅲ—O—B^(Ⅳ*)是极不稳定的。当热场作用时,处于环结构中的B~Ⅲ—O—B~Ⅳ键将转化为一个较稳定的大混合π键,而连接各集团之间的B~Ⅲ—O—B~Ⅳ的化学键断开。当引入Nb_2O_5时,则集团[NbO_6]和[NbO_4]取代[BO_8]进入网络,在高温状态下[NbO_4]结构的电子云变形,使位于870cm^(-1)的Raman张量元为零,但骨架没有塌落,同时[NbO_6]失去了O_h群的对称性,出现了新的散射峰,(化学键没有断裂)。本工作建立了铌硼酸盐玻璃熔融态的结构模型。

This paper first studied the structure of nioboborate glass melts by high temperature Raman spectra and high temperature IR spectra. The experimental results indicated that the B~Ⅲ-O-B~Ⅳ bond is very unstable in the boric glass. Under the heating field the bond B~Ⅲ-O-B~Ⅳ is converted to a stable big-mixing π bond or broken down. When Nb_2O_5 is added the [NbO_6] and [NbO_4]will replace [BO_3] and compose the structure network of glass. In this work the structure model of nioboborate glass melts was established.