The effect of composition on spinel equilibrium and crystal size in high-level waste glass

The equilibrium concentration (Co) of spinel was measured in 16 high-level waste (HLW) glasses as a function of temperature (T). Glasses were formulated by increasing or decreasing concentrations of Al2O3, Cr2O3, Fe2O3, Li2O, MgO, Na2O, or NiO, one-at-a-time, from a baseline composition. Data were f...

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Bibliographic Details
Published in:Journal of materials science 2002-12, Vol.37 (24), p.5327-5331
Main Authors: WILSON, B. K, HRMA, P, ALTON, J, PLAISTED, T. J, VIENNA, J. D
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
CHEMICAL COMPOSITION
Composition effects
CRYSTAL STRUCTURE
Crystals
Exact sciences and technology
GLASS
HIGH-LEVEL RADIOACTIVE WASTES
Liquidus
Lithium oxides
MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
MATERIALS SCIENCE
Mathematical analysis
Nickel oxides
Pollution
Radioactive wastes
Spinel
SPINELS
WASTE FORMS
Wastes
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Summary:The equilibrium concentration (Co) of spinel was measured in 16 high-level waste (HLW) glasses as a function of temperature (T). Glasses were formulated by increasing or decreasing concentrations of Al2O3, Cr2O3, Fe2O3, Li2O, MgO, Na2O, or NiO, one-at-a-time, from a baseline composition. Data were fitted using the quasi-ideal-solution relationship between Co and T. The coefficients of this relationship were expressed as functions of glass composition using first-order approximation. All glass components had an effect on liquidus temperature (TL), but only NiO and Fe2O3 had a significant impact on spinel concentration below TL. The temperature at which Co had a given value was also expressed as a function of glass composition. These results can be used to optimize a HLW glass formulation to meet a constraint of either no spinel or a limited spinel fraction in the melter. In addition, the measurement of the size of spinel crystals and subsequent calculation of crystal number density (n) showed that Cr2O4 and Al2O3 increase n.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1021081126162