A structural bond strength model for glass durability
- Pacific Northwest National Lab., Richland, WA (United States)
- Alfred Univ., NY (United States)
A glass durability model, structural bond strength (SBS) model was developed to correlate glass durability with its composition. This model assumes that the strengths of the bonds between cations and oxygens and the structural roles of the individual elements in the glass arc the predominant factors controlling the composition dependence of the chemical durability of glasses. The structural roles of oxides in glass are classified as network formers, network breakers, and intermediates. The structural roles of the oxides depend upon glass composition and the redox state of oxides. Al{sub 2}O{sub 3}, ZrO{sub 2}, Fe{sub 2}O{sub 3}, and B{sub 2}O{sub 3} are assigned as network formers only when there are sufficient alkalis to bind with these oxides. CaO can also improve durability by sharing non-bridging oxygen with alkalis, relieving SiO{sub 2} from alkalis. The percolation phenomenon in glass is also taken into account. The SBS model is applied to correlate the 7-day product consistency test durability of 42 low-level waste glasses with their composition with an R{sup 2} of 0.87, which is better than 0.81 obtained with an eight-coefficient empirical first-order mixture model on the same data set.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 518664
- Report Number(s):
- CONF-9604124-; TRN: 97:014678
- Resource Relation:
- Conference: 98. annual meeting of the American Ceramic Society, Indianapolis, IN (United States), 14-17 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Ceramic transactions: Environmental issues and waste management technologies in the ceramic and nuclear industries II. Volume 72; Jain, V.; Peller, D. [eds.]; PB: 539 p.
- Country of Publication:
- United States
- Language:
- English
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