Properties of Soda Aluminosilicate Glasses: I, Refractive Index, Density, Molar Refractivity, and Infrared Absorption Spectra

Abstract

The density, refractive index, molar refractivity, and infrared absorption spectra of soda aluminosilicate glasses containing up to 34.8 wt% alumina have been determined. Changes in these properties with composition can be explained by existing theories which assume that the aluminum ions form only A104 tetrahedra when the Al/Na ratio of the glass is equal to or less than 1. The aluminum ions in glasses having an Al/Na ratio larger than 1 are in both fourfold and sixfold coordination.

Crack initiation behavior of sodium aluminosilicate glasses

“…The mean atomic volume was determined as the molar volume divided by the number of atoms in the chemical formula. The results of T g and density are well in agreement with the previous reports [12,13]. The compositional variation of the mean atomic volume implies that the packing density in this glass system increases a little with increasing the Al 2 O 3 /Na 2 O ratio.…”

“…Aluminosilicate glass is one of the most important glass forming systems, and many fundamental researches have been reported on its physical and thermal properties [12][13][14]. Aluminosilicate glasses are commercially used for various glass products, such as a flat panel display glass and a halogen-lamp glass.…”

Inert failure strains of sodium aluminosilicate glass fibers

“…Removing non-bridging oxygens from the structure by adding alumina or by reducing the soda content makes the network stiffer and less responsive to the applied stress, as well as less sensitive to testing rates (V fp ). Relaxation of a silicate network through motions associated with the non-bridging oxygens has been used to explain features found in the internal friction spectra collected from Na-aluminosilicate glasses [14]. The relaxation of structural sites vacated by a diffusing ion through the re-configuration of non-bridging oxygens is an important aspect of recent studies of alkali transport phenomena [15].…”

Nanoscale infrared spectroscopy as a non-destructive probe of extraterrestrial samples

“…This suggests an albitic glass populated by under-resolved nanocrystals of oligoclase, again indicative of rapid cooling from a melt. Demonstrably, nanoFTIR presents a novel means of optical identification and potential compositional characterization 58,59 for bona fide amorphous silicate materials in returned microscale cometary dust grains, as well as in similarly sized interplanetary dust particles or aerosols. The composition of Iris shown here is decidedly inconsistent with the long-held view that comets formed in the outer solar system from agglomerated circum-or interstellar grains 60 , comprising-for example, dust, ice and silicates amorphized by radiation exposure.…”