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Title: Structural Role of Iron in Nepheline-based Aluminosilicates for Nuclear Waste Applications - 18192

Abstract

Vitrified high-level nuclear wastes (HLW) at Hanford are susceptible to unwanted nepheline (nominally NaAlSiO{sub 4}) crystallization. We have studied simplified HLW glass compositions along the NaAlSiO{sub 4}-NaFeSiO{sub 4} join to assess the structural behavior of iron in nepheline-based aluminosilicates as a function of Fe-Al substitution. The samples were melted and subsequently heat-treated to promote crystallization. X-ray diffraction (XRD) shows that Fe promotes the crystallization of nepheline over its high temperature polymorph (carnegieite) when substituted for Al in low additions. Thermal analysis reveals that glass transition temperature, T{sub g}, and crystallization temperature, T{sub c}, decrease with substituting Fe for Al, while staying within the range of 500 deg. C

Authors:
 [1]; ;  [2];  [3];  [1]
  1. Materials Science and Engineering Program, Washington State University, Pullman, WA 99164 (United States)
  2. Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield, S1 1WB (United Kingdom)
  3. Department of Materials Science and Engineering, Rutgers - The State University of New Jersey, Piscataway, NJ 08854 (United States)
Publication Date:
Research Org.:
WM Symposia, Inc., PO Box 27646, 85285-7646 Tempe, AZ (United States)
OSTI Identifier:
22975369
Report Number(s):
INIS-US-20-WM-18192
TRN: US21V0182015411
Resource Type:
Conference
Resource Relation:
Conference: WM2018: 44. Annual Waste Management Conference, Phoenix, AZ (United States), 18-22 Mar 2018; Other Information: Country of input: France; 27 refs.; Available online at: https://www.xcdsystem.com/wmsym/2018/index.html
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; CHEMISTRY; CONTAINERS; CRYSTALLIZATION; GLASS; HEAT TREATMENTS; HEMATITE; HIGH-LEVEL RADIOACTIVE WASTES; IRON; IRON IONS; MAGNETITE; MICROSTRUCTURE; MOESSBAUER EFFECT; RADIOACTIVE WASTE STORAGE; SENSITIVITY; SILICATES; SILICON OXIDES; THERMAL ANALYSIS; TRANSITION TEMPERATURE; VITRIFICATION; X-RAY DIFFRACTION

Citation Formats

Ahmadzadeh, Mostafa, Scrimshire, Alex, Bingham, Paul A., Goel, Ashutosh, McCloy, John S., and School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164. Structural Role of Iron in Nepheline-based Aluminosilicates for Nuclear Waste Applications - 18192. United States: N. p., 2018. Web.
Ahmadzadeh, Mostafa, Scrimshire, Alex, Bingham, Paul A., Goel, Ashutosh, McCloy, John S., & School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164. Structural Role of Iron in Nepheline-based Aluminosilicates for Nuclear Waste Applications - 18192. United States.
Ahmadzadeh, Mostafa, Scrimshire, Alex, Bingham, Paul A., Goel, Ashutosh, McCloy, John S., and School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164. 2018. "Structural Role of Iron in Nepheline-based Aluminosilicates for Nuclear Waste Applications - 18192". United States.
@article{osti_22975369,
title = {Structural Role of Iron in Nepheline-based Aluminosilicates for Nuclear Waste Applications - 18192},
author = {Ahmadzadeh, Mostafa and Scrimshire, Alex and Bingham, Paul A. and Goel, Ashutosh and McCloy, John S. and School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164},
abstractNote = {Vitrified high-level nuclear wastes (HLW) at Hanford are susceptible to unwanted nepheline (nominally NaAlSiO{sub 4}) crystallization. We have studied simplified HLW glass compositions along the NaAlSiO{sub 4}-NaFeSiO{sub 4} join to assess the structural behavior of iron in nepheline-based aluminosilicates as a function of Fe-Al substitution. The samples were melted and subsequently heat-treated to promote crystallization. X-ray diffraction (XRD) shows that Fe promotes the crystallization of nepheline over its high temperature polymorph (carnegieite) when substituted for Al in low additions. Thermal analysis reveals that glass transition temperature, T{sub g}, and crystallization temperature, T{sub c}, decrease with substituting Fe for Al, while staying within the range of 500 deg. C},
doi = {},
url = {https://www.osti.gov/biblio/22975369}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 2018},
month = {Sun Jul 01 00:00:00 EDT 2018}
}

Conference:
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