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Crystal chemistry of the rhombohedral MO{sub 3} {center_dot}3R{sub 2}O{sub 3} compounds

Conference ·
OSTI ID:4878733
; ;

Phase relationship studies on the UO/sub 2/-UO/sub 3/-Y/sub 2/O/sub 3/ ternary system showed the formation of face-centered cubic solid solutions, body- centered cubic solid solutions, and two rhombohedral phases. Both rhombohedral phases exist at a definite chemical composition, one of which (Rh I) can be expressed by the formula (U/sub x/, Y/sub 7-x/)O/sub 12/ where x = 1 to 3.4. For values of x greater than 2.8, low temperature oxidation produces a second rhombohedral structure (Rh II) of composition (U/sub y/, Y/sub 8- gamma /)O/sub 15/ where y = 2 to 3.9. The rhombohedral I crystal structure is characteristic of a large family of new compounds formed between rare earth oxides and UO/sub 3/ , WO/sub 3/, or MoO/sub 3/. Crystallographic data on these isostructural compounds are presented. The influence of ionic size and valence upon the formation and stability of this structure are discussed. (auth)

Research Organization:
General Electric Co., Cincinnati, OH (United States)
Sponsoring Organization:
U.S. Air Force, Div. of Reactor Development
NSA Number:
NSA-18-006836
OSTI ID:
4878733
Report Number(s):
CONF-45--1; AED-Conf--63-203-1; TM--63-10-2
Country of Publication:
United States
Language:
English

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Related Subjects

ARGON
ARGON 41
CHEMISTRY
CLATHRATES
COMPLEXES
COMPOUNDS
CONFIGURATION
CONTROL
CRYSTALS
GASES
HALF-LIFE
IONS
IRRADIATION
LATTICES
LOW TEMPERATURE
MIXING
MOLYBDENUM OXIDES
OPERATION
OXIDATION
OXIDES
PREPARATION
PRODUCTION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
QUINONES
RADIATION SOURCES
RADIOACTIVITY
RADIOISOTOPES
RARE EARTHS
RARE GASES
SAFETY
SAMPLING
SOLID SOLUTIONS
STABILITY
STORAGE
TRAPS
TUNGSTEN OXIDES
URANIUM DIOXIDE
URANIUM TRIOXIDE
USES
YTTRIUM OXIDES