Hydrothermal equilibria and crystal chemistry of phases in the oxide-hydroxide-sulfate systems of La, Pr, and Nd
Journal Article
·
· J. Solid State Chem.; (United States)
Equilibria of the aqueous Ln + O + SO/sub 4/ (Ln = La, Pr, Nd) system have been investigated at water pressure of 120 +/- 20 MPa and temperatures of 450 +/- 50/sup 0/C. At low sulfate contents, the UCl/sub 3/-type trihydroxides coexist with the orthorhombic dioxide monosulfates. A second two-phase region, Ln/sub 2/O/sub 2/SO/sub 4/ + Ln(OH)SO/sub 4/, appearing at higher sulfate concentrations is followed by a third two-phase region, Ln(OH)SO/sub 4/ + Ln/sub 2/(SO/sub 4/)/sub 3/ x nH/sub 2/O. Whereas the monohydroxide monosulfates all have the same monoclinic structure, several new hydrate compositions and structures form in hydrothermal media. X-ray diffraction data indicate that the n = 7 hydrates of La and Pr and the monohydrate of La have closely related orthorhombic structures similar to that of the anhydrous La/sub 2/(SO/sub 4/)/sub 3/ phase obtained by decomposition of the hydrates at low temperature. The n = 5 sulfate hydrates of Pr and Nd have also been characterized, and a metastable La/sub 2/(OH)/sub 4/SO/sub 4/ phase has been identified. Lattice parameters and diffraction data obtained by powder and single crystal methods are reported, and the thermal decomposition reactions of the products are described.
- Research Organization:
- Rockwell International, Golden, CO (USA)
- OSTI ID:
- 6976688
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 73:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
POWDERS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
SCATTERING
SPACE GROUPS
SULFATES
SULFUR COMPOUNDS
THERMODYNAMICS
X-RAY DIFFRACTION
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
POWDERS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
SCATTERING
SPACE GROUPS
SULFATES
SULFUR COMPOUNDS
THERMODYNAMICS
X-RAY DIFFRACTION