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

Conference · Sun Jul 01 00:00:00 EDT 2018

OSTI ID:22975369

Ahmadzadeh, Mostafa ^[1]; Scrimshire, Alex; Bingham, Paul A. ^[2]; Goel, Ashutosh ^[3]; McCloy, John S. ^[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)

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

• Research Organization: WM Symposia, Inc., PO Box 27646, 85285-7646 Tempe, AZ (United States)
• OSTI ID: 22975369
• Report Number(s): INIS-US-20-WM-18192; TRN: US21V0182015411
• 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

Related Subjects

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