二硅酸钠晶体、玻璃及其熔体结构的拉曼光谱研究

High Temperature Raman Spectroscopic Study of the Structure of Sodium Disilicate Crystal,Glass and Its Melt

采用铜蒸气脉冲激光光源和时间分辨探测技术 ,实现了对JYU10 0 0拉曼光谱仪的高温改造 ,可在样品温度高至 2 0 2 3K下稳定地测谱 ;二硅酸钠晶体、玻璃及其熔体的测量结果表明 ,高温Raman光谱不仅可分辨不同的结构相、提供固 液相变信息 ,而且能分析具有不同桥氧数的硅氧四面体微结构单元 ,即聚合状况以及它们随温度的变化 ,因而为物质的结构研究 ,特别是高温状态的熔体的研究 ,提供了重要的手段和依据。

The structure of Na 2Si 2O 5 from room temperature up to 1 773 K are studied by high temperature Raman spectroscopy using copper vapor pulse laser and integral time resolved detection technique without any black body radiation effect on spectral record.Back scattering optical configuration is coupled with confocal collection of Raman signal of macro sample in the high temperature shaft tube furnace.Results show that temperature dependent Raman spectra can clearly indicate phase transition during melting.Relative densities of various kinds of SiO (n-4) 4(n,bridging oxygen number binding to one tetrahedron former Si) tetrahedrons can be qualitatively and quantitatively resolved by Gaussian spectral deconvolution.Obviously high temperature Raman spectroscopy provides an useful tool for the micro structure research of materials under high temperature.