摘要
首次采用高温红外光谱及DSC-7差热分析技术研究了Nb_2O_5-B_2O_3-K_2O系统玻璃熔融态结构。在硼玻璃中存在不稳定的B^(Ⅲ)—O—B^(Ⅳ)缺电子离域大σ键。当引入Nb_2O_5后,集团[NbO_4]和[NbO_6]取代[BO_s]和[BO_4]进入结构网络。Nb的电场使B^(Ⅲ)—O—B^(Ⅳ)键断开,形成新的稳定的Nb—O—B^(Ⅳ)键。在铌硼酸盐玻璃中,[NbO_4]和[NbO_6]是共存的。本工作建立了该系统玻璃和高温熔融态结构模型。
The structure of nioboborate glass melts in the Nb_2O_5-B_2O_3-K_2O system is studied by IR spectra at high temperature for the first time. In boric glass, the large σ bond of defect electron deviation field between B~Ⅲ—O—B~Ⅳ is very unstable. When Nb_2O_5 is added to the glass, the groups of [NbO_4] and [NbO_6] will replace the [BO_5] and [BO_4] and compose a new structural network. The Nb electrical field makes B~Ⅲ—O—B~Ⅳ bonds break down, forming a stable Nb—O—B~Ⅳ bond. In the nioboborate glass, the groups of [NbO_4] and [NbO_6] are co-existed. A Structure model of the glass melts and glass is proposed in the paper.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1991年第1期44-51,共8页
Journal of The Chinese Ceramic Society
