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Title: A glass durability model based on understanding glass chemistry and structural configurations of the glass constituents

Abstract

An improved structural bond strength (SBS) model has been developed to quantify the correlation between glass compositions and their chemical durabilities. The SBS model assumes that the strengths of the bonds between cations and oxygens and the structural roles of the individual elements in the glass are 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 on 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 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 binding order to alkalis is Al{sub 2}O{sub 3} > ZrO{sub 2} > Fe{sub 2}O{sub 3} > B{sub 2}O{sub 3} > CaO > SiO{sub 2}. The percolation phenomenon in glass is also taken into account. The concentration of network formers as to reach a critical value for a glass to become durable; durable glasses are sufficient in network formers and have a complete network structure;more » poor durability glasses are deficient in network formers and the network is incomplete and discontinuous. The SBS model is capable of correlating 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.« less

Authors:
 [1];  [2]
  1. Pacific Northwest National Lab., Richland, WA (United States)
  2. Alfred Univ., NY (United States)
Publication Date:
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
500985
Report Number(s):
CONF-960401-
ISBN 1-55899-335-5; TRN: 97:012714
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: 1997; Related Information: Is Part Of Aqueous chemistry and geochemistry of oxides, oxyhydroxides, and related materials; Voigt, J.A. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Wood, T.E. [ed.] [3M Co., St. Paul, MN (United States)]; Bunker, B.C. [ed.] [Pacific Northwest Lab., Richland, WA (United States)]; Casey, W.H. [ed.] [Univ. of California, Davis, CA (United States)]; Crossey, L.J. [ed.] [Univ. of New Mexico, Albuquerque, NM (United States)]; PB: 384 p.; Materials Research Society symposium proceedings, Volume 432
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 05 NUCLEAR FUELS; GLASS; CORROSION RESISTANCE; CHEMICAL COMPOSITION; WASTE FORMS; MATHEMATICAL MODELS; REDOX POTENTIAL; ALUMINIUM OXIDES; ZIRCONIUM OXIDES; IRON OXIDES; BORON OXIDES; CALCIUM OXIDES; SILICON OXIDES; LOW-LEVEL RADIOACTIVE WASTES

Citation Formats

Feng, X, and Metzger, T B. A glass durability model based on understanding glass chemistry and structural configurations of the glass constituents. United States: N. p., 1997. Web.
Feng, X, & Metzger, T B. A glass durability model based on understanding glass chemistry and structural configurations of the glass constituents. United States.
Feng, X, and Metzger, T B. Fri . "A glass durability model based on understanding glass chemistry and structural configurations of the glass constituents". United States.
@article{osti_500985,
title = {A glass durability model based on understanding glass chemistry and structural configurations of the glass constituents},
author = {Feng, X and Metzger, T B},
abstractNote = {An improved structural bond strength (SBS) model has been developed to quantify the correlation between glass compositions and their chemical durabilities. The SBS model assumes that the strengths of the bonds between cations and oxygens and the structural roles of the individual elements in the glass are 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 on 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 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 binding order to alkalis is Al{sub 2}O{sub 3} > ZrO{sub 2} > Fe{sub 2}O{sub 3} > B{sub 2}O{sub 3} > CaO > SiO{sub 2}. The percolation phenomenon in glass is also taken into account. The concentration of network formers as to reach a critical value for a glass to become durable; durable glasses are sufficient in network formers and have a complete network structure; poor durability glasses are deficient in network formers and the network is incomplete and discontinuous. The SBS model is capable of correlating 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {8}
}

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