铌硼酸盐玻璃熔体结构和性质的研究

本工作采用高温红外光谱,高温Raman光谱,高温偏光显微镜,以及原子径向分布函数,(RDF),DSC-7差热分析仪,粘度计等技术,研究了Nb₂O₅-B₂O₃-K₂O系统玻璃的高温熔体结构与性质。根据硼酸盐与铌硼酸盐玻璃高温熔体与常温玻璃结构的对比实验得出了在硼玻璃中,B^Ⅲ-O-B^Ⅳ为缺电子离域大σ键结合,并且,极不稳定。当向硼玻璃中引入Nb₂O₅,随着Nb₂O₅含量增加,将形成稳定的B^Ⅳ-O-Nb化学键,由于熔体中的环状结构逐渐增多,从而改善了玻璃的稳定性和各种机械性质。文章还论述了两类玻璃的析晶速度与其熔体结构和温度的相关性。

The Structure and Properties of Nioboborate Glass Melts

Based on the experimental results of high temperature IR spectra, high temperature Raman spectra, high temperature micropolariscope, RDF (r) and DSC-7 differential thermal analysis etc., the structure and properties of glass melts in the Nb₂O₅-B₂O₃-K₂O system have been investigated. By comparing the structure of high temperature glass melts and the structure of glass in room temperature of Nioboborate and Borate, we found out that the B^Ⅲ-O-B^Ⅳ bond of borate glass isalarge σ bond(poor of electron) and is very unsteady. When intr-oducing Nb₂O₅ into borate glass, the B^Ⅳ-O-Nb bond is produced in glass as the Nb₂O₅ content increases. Because the quantity of circuit structure increases gradually, so the glass stabitity and mechanic properties of glass are improved. Further more, the relationship between crystallo-velocity and the temperature, glass melts structure etc.