Evaluating the phase composition of the surface of bioactive glasses following their interaction with simulated body fluid, with the use of x-ray diffraction analysis

Following interaction with simulated body fluid, apatite and calcite were identified on the surface of bioactive glasses. The phase composition of the glass surface layer after elution is affected by the experimental conditions. At a high ratio of sample surface… Read moreEvaluating the phase composition of the surface of bioactive glasses following their interaction with simulated body fluid, with the use of x-ray diffraction analysis

Interfaces between alumina and refractory glasses for high temperature applications

Joining of alumina ceramics with glasses for high temperature applications was investigated. A range of glass formulations encompassing ternary (Al//2O//3-CaO-SiO//2, Al//2O//3-SiO//2-MgO), and quaternary (Al//2O//3-CaO-SiO//2- ZrO//2) glasses was selected. The glasses were selected so that they would reach chemical equilibrium with… Read moreInterfaces between alumina and refractory glasses for high temperature applications

Specific heats and Gruneisen constant of aluminosilicate glasses containing rare-earth oxides

Rare-earth aluminosilicate glasses were prepared from Shirasu (volcanic ash) and yttria concentrate as the main starting materials. Specific heats and elastic constants of these glasses were measured at room temperature. Using these values and previously measured values of thermal expansion… Read moreSpecific heats and Gruneisen constant of aluminosilicate glasses containing rare-earth oxides

Irreversible and reversible changes in silica glasses observed by electrical properties (Part 2) – quartz glass by flame fusion

The effect of heat treatment on electrical properties of a quartz glass prepared by flame fusion was investigated and the following results were obtained. (1) When the glass was heated at 1000 degree C, the electrical conductivity increased irreversibly with… Read moreIrreversible and reversible changes in silica glasses observed by electrical properties (Part 2) – quartz glass by flame fusion

Coloration of fluorophosphate glasses containing fluorescein molecules by heat treatment or gamma ray irradiation

The 70SnF//2 center dot 30P//2O//5 glasses containing 25-500 ppm of fluorescein exhibit change in color from light yellow to reddish orange (absorption maximum, lambda equals 500 nm) when heated at 240 degree C for 120-180 min. The fluorophosphate glasses also… Read moreColoration of fluorophosphate glasses containing fluorescein molecules by heat treatment or gamma ray irradiation

Dispersion of Thermooptic Coefficients of Soda-Lime-Silica Glasses

The thermooptic coefficients, i.e., the variation of refractive index with temperature (dn/dT), are analyzed in a physically meaningful model for two series ofsoda-lime-silica glasses, 25Na//2O·xCaO·(75-x)SiO//2 and (25-x)Na//2O·xCaO·75SiO//2. This model is based on three physical parameters—the thermal expansioncoefficient and excitonic and… Read moreDispersion of Thermooptic Coefficients of Soda-Lime-Silica Glasses