The incorporation of cerium in zirconolite

Book · Wed Dec 31 00:00:00 EST 1997

OSTI ID:572076

Begg, B D; Vance, E R ^[1]

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1. ANSTO, Menai, New South Wales (Australia). Materials Div.

Zirconolite (CaZrTi{sub 2}O{sub 7}) is the primary actinide-bearing Synroc phase for the immobilization of high-level nuclear waste. Using X-ray absorption spectroscopy and microanalysis the authors have investigated the incorporation of cerium, as a simulant for plutonium, on both zirconolite`s Ca and Zr sites under a range of redox conditions. The Ce valence state was found to vary between Ce{sup 3+} and Ce{sup 4+} depending on both the sintering atmosphere and temperature. The existence of alternative charge compensation schemes, predominantly cation vacancies, in addition to those used in the sample design was inferred in many of the zirconolites and will be discussed in detail.

• OSTI ID: 572076
• Report Number(s): CONF-961202-; TRN: 98:003709
• Resource Relation: Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of Scientific basis for nuclear waste management XX; Gray, W.J. [ed.] [Pacific Northwest National Lab., Richland, WA (United States)]; Triay, I.R. [ed.] [Los Alamos National Lab., NM (United States)]; PB: 1389 p.; Materials Research Society symposium proceedings, Volume 465
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
05 NUCLEAR FUELS
CERIUM
ION EXCHANGE
ZIRCONOLITE
SORPTIVE PROPERTIES
SYNROC PROCESS
HIGH-LEVEL RADIOACTIVE WASTES
SIMULATION
PLUTONIUM
PHASE STUDIES
EXPERIMENTAL DATA