Glass Formation, Properties and Structure of Y2O3Al2O3B2O3 Glasses
The glass formation and stable liquid immiscibility region in the Y2O3Al2O3B2O3 (YAB) system has been determined. Infrared and Raman spectra of YAB glasses indicate that, like La2O3Al2O3B2O3 (LAB) glasses, they consist of (AlB2O6)∞ chains composed of AlO4 tetrahedral and BO3 triangular units. These chains are similar to those found in lanthanide metaborates (LnB3O6) except that the BO4 units have been replaced by AlO4 units. On devitrification, these glasses yield YBO3 and YAl3(BO3)4 whose structure bears no similarity to those of related glasses. Glass formation in the YAB system has been attributed to the presence of (AlB2O6)∞ chains. The molar volume (mv) and transformation temperature (Tg) have been measured. The Tg of some of the glasses in this system is as high as 750°C. The dependence of the physical properties of YAB glasses on composition is discussed in terms of structural changes.
I. N. Chakraborty et al., "Glass Formation, Properties and Structure of Y2O3Al2O3B2O3 Glasses," Journal of Non-Crystalline Solids, vol. 84, no. 1-3, pp. 86-92, Elsevier, Jul 1986.
The definitive version is available at http://dx.doi.org/10.1016/0022-3093(86)90764-7
Materials Science and Engineering
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