摘要
Borosilicate glasses,with x B2O3-（60-x）SiO2-8ZrO2-8Ta2O5-24Na2O（7≤x≤59 mol%）composition,were fabricated by melt-quenching technique.NMR,UV-Vis,Raman and IR spectroscopic studies were utilized to investigate the structure of fabricated glasses.The NMR spectrum was deconvoluted into five Gaussian bands,assigned to ^4B（0B,4Si）,^4B（1B,3Si）,^4B（2B,2Si）,^3B（rings）and ^3B（loose）,to get their quantitative information.The relative dispersion deviation？P（g,F） was attributed to the relative quantity of ^3B（rings）but not all ^3B groups,and B2O3 existed mainly as[BO3]in rings firstly,and then as[BO3]in loose condition.The UV-Vis spectra revealed that the quantity of non-bridging oxygen increased firstly and then decreased with increasing concentration of B2O3.Acting as complementary techniques,Raman and IR measurements revealed that four-coordinated boron and silica mainly existed as ^4B-O-B,and Si-O-Si in Q^2,respectively,as chain structure but not framework structure,and[B？4]units prefered connections with borate rather than with silicate entities of the glass network in these studied glasses.In addition,the conclusion also certified that ^3B in＂loose＂condition located in lower wavenumbers between 1 200-1 600 cm^-1 in Raman spectra.
Borosilicate glasses,with x B2O3-（60-x）SiO2-8ZrO2-8Ta2O5-24Na2O（7≤x≤59 mol%）composition,were fabricated by melt-quenching technique.NMR,UV-Vis,Raman and IR spectroscopic studies were utilized to investigate the structure of fabricated glasses.The NMR spectrum was deconvoluted into five Gaussian bands,assigned to ^4B（0B,4Si）,^4B（1B,3Si）,^4B（2B,2Si）,^3B（rings）and ^3B（loose）,to get their quantitative information.The relative dispersion deviation？P（g,F） was attributed to the relative quantity of ^3B（rings）but not all ^3B groups,and B2O3 existed mainly as[BO3]in rings firstly,and then as[BO3]in loose condition.The UV-Vis spectra revealed that the quantity of non-bridging oxygen increased firstly and then decreased with increasing concentration of B2O3.Acting as complementary techniques,Raman and IR measurements revealed that four-coordinated boron and silica mainly existed as ^4B-O-B,and Si-O-Si in Q^2,respectively,as chain structure but not framework structure,and[B？4]units prefered connections with borate rather than with silicate entities of the glass network in these studied glasses.In addition,the conclusion also certified that ^3B in＂loose＂condition located in lower wavenumbers between 1 200-1 600 cm^-1 in Raman spectra.
