Impact of the Atomic Packing Density on the Properties of Nitrogen-Rich Calcium Silicate Oxynitride Glasses

Abstract

In this work, the impact of the atomic packing density/fractional glass compactness of Ca–Si–O–N glasses on glass transition and crystallization temperatures, glass density, microhardness, molar volume, and refractive index were examined. It was found that the atomic packing density increased with increasing the nitrogen content and decreased with increasing the Ca content in the glass network. Furthermore, density, glass transition and crystallization temperatures, and refractive index, increased with an increasing atomic packing density of the glass, while molar volume increased with decreasing atomic packing density values. The change in hardness with atomic packing density is less clear and suggests that the atomic packing density does not solely control the underlying deformation mechanism. There is indeed competition between densification (favored at low packing density values) and isochoric shear (at larger packing density). Despite that, the effects of nitrogen as a network former and Ca as a modifier are significantly independent. The obtained results indicate that the atomic packing density of the prepared samples linearly depends on many mechanical and optical properties, suggesting that the glass network and cross-linking are proportional to the ionic radius of the Ca and the nitrogen content, respectively.

Investigation on the effect of ZnO/PbO exchange on Physical and Optical Properties of Tellurite Sodium Bismuth Zinc doped Lead Oxide Glasses

“…The substitution of ZnO/PbO leads to a reduction in the glass's molecular weight since ZnO has a smaller molecular weight (81.37 g/mol) compared to PbO (223.2 g/mol), while TeO2 possesses a sufficient molecular weight (159.59 g/mol). The increase in density indicates a more compact and rigid glass network, making it highly possible for development as a shielding material [22].…”