²⁹Si MAS NMR of Na-Si-O-N Oxynitride Glasses

Atomic Structure of Rare Earth Si-Al-O-N Glasses

In this paper the results of X-ray diffraction experiments of Ln-Si-Al-O-N (Ln = La, Gd, Yb) glasses are presented. Total structure factors and pair correlation functions allow the determination of the first coordination sphere of Ln atoms. The bond lengths observed correspond to the ionic radii of the Ln-ions surrounded by oxygen and nitrogen atoms. The presence of non-bridging nitrogen is dis...

The distribution of sodium ions in aluminosilicate glasses: A high-field Na-23 MAS and 3Q MAS NMR study

The local configurations around sodium ions in silicate glasses and melts and their distributions have strong implications for the dynamic and static properties of melts and thus may play important roles in magmatic processes. The quantification of distributions among charge-balancing cations, including Na in aluminosilicate glasses and melts, however, remains a difficult problem that is releva...

A NEW GENERATION OF OXYNITRIDE GLASSES CONTAINING FLUORINE

Oxynitride glasses are found as grain boundary phases in silicon nitride ceramics. They are effectively alumino-silicate glasses in which nitrogen substitutes for oxygen in the glass network, and this causes increases in glass transition and softening temperatures, viscosities (by two to three orders of magnitude), elastic moduli and microhardness. Calcium silicate-based glasses containing fluo...

Elastic properties and surface damage resistance of nitrogen-rich (Ca,Sr)-Si-O-N glasses

Oxynitride Glasses Prepared from Gels and Melts

The structures of glasses prepared by melting mixtures of alkali borosilicate glass and silicon nitride powders and by ammonolysis of porous borosilicate gels were studied using Fourier transform infrared spectroscopy and combustion analysis. Whereas there was little evidence of nitride bond formation in the melt prepared glasses, Si-N and B-N bonding were observed in the gel-derlved glasses. I...