Redox systematics in model glass compositions from West Valley
- Virginia Military Institute, Lexington, VA (United States)
At a processing temperature of 1150{degrees}C for model West Valley glass composition, the prescribed range of oxygen fugacities needed to achieve an [Fe{sup 2+}]/[Fe{sup 3+}] of 0.1 to 0.5 is 10{sup -4} to 10{sup -7} atm. Establishment of the Fe{sup 2+}-Fe{sup 0} equilibrium, resulting in metal precipitation from the melt, occurs at oxygen fugacities lower than 10{sup -11} atm at this temperature. The target processing range as defined by the iron redox ratio is equally valid at both lower and higher temperatures ({+-}100{degrees}C). Elevations of the concentrations of redox-active components to 1 wt% Cr{sub 2}O{sub 3}, 1 wt% NiO, 1 wt% CeO{sub 2}, and 4 wt% Mn{sub 2}O{sub 3} in the waste glass will not affect the redox limits as established by the iron redox ratio of 0.1 to 0.5; these limits provide sufficiently large margins of safety to assure no stabilization of reduced or oxidized forms of these elements.
- OSTI ID:
- 63858
- Report Number(s):
- CONF-921101-Vol.294; TRN: 95:002922-0009
- Resource Relation:
- Conference: 16. Materials Research Society (MRS) fall meeting, Boston, MA (United States), 30 Nov - 5 Dec 1992; Other Information: PBD: 1993; Related Information: Is Part Of Scientific basis for nuclear waste management XVI; Interrante, C.G. [ed.] [Nuclear Regulatory Commission, Washington, DC (United States)]; Pabalan, R.T. [ed.] [Southwest Research Inst., San Antonio, TX (United States)]; PB: 959 p.
- Country of Publication:
- United States
- Language:
- English
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