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Title: The crystallization behavior of the West Valley reference borosilicate glass. Progress report, October 1, 1986--September 30, 1987

Abstract

The crystallization behavior of a fully simulated reference borosilicate glass was studied. This work was required by the Waste Acceptance Preliminary Specifications. It included preparing and characterizing the base glass in various redox states, and assessing the influence of redox state on crystallization behavior. Characterization tools included optical and electron microscopy, wet chemical analysis, x-ray diffraction, dilatometry, and differential scanning calorimetry. Effect of cooling a melt at a rate and history simulating in-canister cooling used for full-scale vitrification at West Valley also was determined. The fully oxidized glass composition study contains residual crystalline phases (spinel and cerium-thorium oxide) at 0.4--1.6 vol %. Upon isothermal heat treatment above a measured glass transition temperature of 478C, but below the estimated liquidus of 1000C, crystallization would increase to 4--5 vol % for times up to 384 hours. Crystallization products included spine, acmite, cerium-thorium oxide, and alumino silicates. Crystallization rate was maximum at 700--800C. After 12 hours at 800C the glass crystallized to 3.0 vol %. This same glass, when reduced to a redox state where the ratio of Fe{sup ++}/total iron was 10%, showed a lower crystallization maximum, i.e., 600--700C. The glass transition temperature of this partially reduced glass also was lowered frommore » 478C (fully oxidized) to 474C. All of these observations are in accord with the general theories of glass science. A critical cooling rate of 1.48C/min would be sufficient to limit crystallization to less than 2.0 vol %. This predicted value was confirmed by cooling a melt at this temperature and then estimating the volume percent crystallization.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
West Valley Nuclear Services Co., Inc., West Valley, NY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10197008
Report Number(s):
DOE/NE/44139-44
ON: DE95004250;
DOE Contract Number:
AC07-81NE44139
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1988
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; WASTE FORMS; CRYSTALLIZATION; BOROSILICATE GLASS; PROGRESS REPORT; WEST VALLEY PROCESSING PLANT; HEAT TREATMENTS; MEASURING METHODS; PHASE STUDIES; 052001; 360602; WASTE PROCESSING; STRUCTURE AND PHASE STUDIES

Citation Formats

Joseph, I., Mathur, A., Capozzi, C., Sehgal, J., Butts, D., McPherson, D., and Pye, L.D.. The crystallization behavior of the West Valley reference borosilicate glass. Progress report, October 1, 1986--September 30, 1987. United States: N. p., 1988. Web. doi:10.2172/10197008.
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Joseph, I., Mathur, A., Capozzi, C., Sehgal, J., Butts, D., McPherson, D., & Pye, L.D.. The crystallization behavior of the West Valley reference borosilicate glass. Progress report, October 1, 1986--September 30, 1987. United States. doi:10.2172/10197008.
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Joseph, I., Mathur, A., Capozzi, C., Sehgal, J., Butts, D., McPherson, D., and Pye, L.D.. Fri . "The crystallization behavior of the West Valley reference borosilicate glass. Progress report, October 1, 1986--September 30, 1987". United States. doi:10.2172/10197008. https://www.osti.gov/servlets/purl/10197008.
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@article{osti_10197008,
title = {The crystallization behavior of the West Valley reference borosilicate glass. Progress report, October 1, 1986--September 30, 1987},
author = {Joseph, I. and Mathur, A. and Capozzi, C. and Sehgal, J. and Butts, D. and McPherson, D. and Pye, L.D.},
abstractNote = {The crystallization behavior of a fully simulated reference borosilicate glass was studied. This work was required by the Waste Acceptance Preliminary Specifications. It included preparing and characterizing the base glass in various redox states, and assessing the influence of redox state on crystallization behavior. Characterization tools included optical and electron microscopy, wet chemical analysis, x-ray diffraction, dilatometry, and differential scanning calorimetry. Effect of cooling a melt at a rate and history simulating in-canister cooling used for full-scale vitrification at West Valley also was determined. The fully oxidized glass composition study contains residual crystalline phases (spinel and cerium-thorium oxide) at 0.4--1.6 vol %. Upon isothermal heat treatment above a measured glass transition temperature of 478C, but below the estimated liquidus of 1000C, crystallization would increase to 4--5 vol % for times up to 384 hours. Crystallization products included spine, acmite, cerium-thorium oxide, and alumino silicates. Crystallization rate was maximum at 700--800C. After 12 hours at 800C the glass crystallized to 3.0 vol %. This same glass, when reduced to a redox state where the ratio of Fe{sup ++}/total iron was 10%, showed a lower crystallization maximum, i.e., 600--700C. The glass transition temperature of this partially reduced glass also was lowered from 478C (fully oxidized) to 474C. All of these observations are in accord with the general theories of glass science. A critical cooling rate of 1.48C/min would be sufficient to limit crystallization to less than 2.0 vol %. This predicted value was confirmed by cooling a melt at this temperature and then estimating the volume percent crystallization.},
doi = {10.2172/10197008},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Apr 01 00:00:00 EST 1988},
month = {Fri Apr 01 00:00:00 EST 1988}
}
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Technical Report:
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DOI:  10.2172/10197008
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