Fabrication and Optical Properties of Mixed-Anion Glasses and Its Transparent Glass-Ceramics

The Fabrication process of Ge-S glass is discussed. The effects of La D22 D2O D23 D2 addition onthe optical and thermal properties are studied for glasses in theGa - D22 - D2S - D23 - D22 - D2S - D23 - D2 (GLS) andGa - D22 - D2S - D23 - D22 - D2O - D23 - D22 - D22 - D2S - D23 - D2(GLSO) systems. GLSO glass hasrelatively shorter absorption edge in both vislble and infrared regions，compared with GLS glass. GLS and GLSO glasses show low dispersion characteristics in comparisonheavy metal gallate glasses with similar refractive indexes. The characteristics of high refractiveindexes and low dispersion in GLS and GLSO glasses are high packing densities ofsii D12- sie D1 and O sii D12- sie D1 ions due to the large concentrations of La sii D22 sie D2S sie D23 D2 andD22 - D2O - D23 - D2 with high anion coordination nubers. time - T emperature-transformation （TTT）diagrams during the crystallization processes of GLS and GLSO glasses are combined with thetemperature dependence of viscosity to evaluate thermal stability for fiber drawing. Transparentglass-ceramics prepared by the isothermal treatments of GLSO glasses. the transparentglass-ceramics contain fine needle-like crystals with 0.5 - 1μm length and 0.1μm wide；its crystalline phase is Ga - D26 - D2La - d23.33 - D2S - D214-x - D2O - D2x - D2 with melilite silicatestructure. The effect of crystallization on The fluorescence properties of Nd - 13+ D1：D14 D1F d23 /2- D14 D14 D1I d211 /2 D2 transition is evaluated. The results suggest that TheGa - D26 - D2La - d23.33 - D2S - D214-x - D2O - D2x - D2 fine crystals contain Nd - D13+ dd1 ions as thesubstitions of La D13+ D1 ions

The Fabrication process of Ge-S glass is discussed. The effects of LaィイD22ィエD2OィイD23ィエD2 addition on the optical and thermal properties are studied for glasses in the GaィイD22ィエD2SィイD23ィエD2-LaィイD22ィエD2SィイD23ィエD2 (GLS) and GaィイD22ィエD2SィイD23ィエD2-LaィイD22ィエD2OィイD23ィエD2-LaィイD22ィエD2SィイD23ィエD2(GLSO) systems. GLSO glass has relatively shorter absorption edge in both vislble and infrared regions, compared with GLS glass. GLS and GLSO glasses show low dispersion characteristics in comparison with heavy metal gallate glasses with similar refractive indexes. The characteristics of high refractive indexes and low dispersion in GLS and GLSO glasses are related to the high packing densities of SィイD12-ィエD1 and OィイD12-ィエD1 ions due to the large concentrations of LaィイD22ィエD2SィイD23ィエD2 and LaィイD22ィエD2OィイD23ィエD2 with high anion coordination nubers. Time-temperature-transformation (TTT) diagrams during the crystallization processes of GLS and GLSO glasses are combined with the temperature dependence of viscosity to evaluate thermal stability for fiber drawing. Transparent glass-ceramics were prepared by the isothermal treatments of GLSO glasses. The transparent glass-ceramics contain fine needle-like crystals with 0.5 - 1μm length and 0.1μm wide ; its crystalline phase is GaィイD26ィエD2LaィイD23.33ィエD2SィイD214-xィエD2OィイD2xィエD2 with melilite silicate structure. The effect of crystallization on the fluorescence properties of NdィイD13+ィエD1 : ィイD14ィエD1FィイD23/2-ィエD2ィイD14ィエD1IィイD211/2ィエD2 transition is evaluated. The results suggest that the GaィイD26ィエD2LaィイD23.33ィエD2SィイD214-xィエD2OィイD2xィエD2 fine crystals contain NdィイD13+ィエD1 ions as the substitions of LaィイD13+ィエD1 ions