Glasses Technology

United States Patent 3,944,352 Morgan March 16, 1976

Glasses Patent Abstract
This invention relates to heat absorbing glass compositions exhibiting strain points in excess of 560.degree.C. and transmissions to visible radiations suitable for optical applications. (more…)

The sol-gel process has been successfully applied to the preparation of a small-particle-size CdS-doped silica matrix with a significant quantum size effect. Transparent and colorless gels were prepared through the hydrolysis of a complex solution of Si(OC2H5)4, (CH3)2SO, and Cd(CH3COO)2 · 2H2O. These gels were heated at 350, 500, 750, and 1000? to form fine, hexagonal, CdS-microcrystal-doped glasses. The thermal treatments of samples were established by TDA/TGA analysis. (more…)

Raman scattering and X-ray absorption studies have been performed on nonlinear optical glasses with compositions xTiO2, y NaPO3, zNa2B4O7 (y/z = 0.95/0.05 and x = 0 to 42.2% molar). A model is proposed to explain the progressive modifications of Raman and XAFS spectra with increasing x. Two different types of oxygenated sites for titanium have been identified, in which Ti is respectively six-fold and (more…)

The selection of materials for semiconductor device passivation was investigated as regards the application of ZnO- and PbO-based glasses in MOS (metal, oxide, and silicon) devices. It was found that mechanisms affecting the application of these glasses to MOS devices were related to the molar polarizabilities and the OH radical contents in glasses. (more…)

Carbon in Mid-Atlantic Ridge basalt glasses from 28°N to 63°N: Evidence for a carbon-enriched Azores mantle plume

We report on 91 analyses of CO2 in fresh, `macrovesicle-free? Mid-Atlantic Ridge (MAR) basalt glasses from 48 dredge stations located between 28°N and Iceland. A stepped heating gas chromatographic technique was used for the analyses. Concentrations of carbon as CO2 in the glasses range from 30 to 1014 ppm and always exceed the experimentally determined pressure-dependent equilibrium CO2 solubility curve for tholeiitic basalts at 1200°C determined by Stolper and Holloway [1]. (more…)

We have determined argon solubility and diffusivity in SiO2, NaAlSi3O8, and rhyolitic composition glasses exposed to an equimolar Ar/He gas mixture at 1225-2500 bars and 500-850°C. The diffusivity results from the mixed Ar/He experiments are almost identical to those from experiments with pure Ar. (more…)