Neutron diffraction study of the anion-excess fluorite-related Ca/sub 1-x/Th/sub x/F/sub 2+2x/ solid solution
Journal Article
·
· J. Solid State Chem.; (United States)
The defect structure of Ca/sub 1-x/Th/sub x/F/sub 2+2x/ solid solution (0 less than or equal to x less than or equal to 0.18) has been examined by powder neutron diffraction. Two kinds of interstitials whose respective numbers increase linearly with increasing dopant concentration, can be distinguished: one labeled F'' (x approx. =0.41) is a true interstitial anion, the other noted F'' (x approx. =0.30) can be considered as a relaxed normal F anion. Two models of defect clusters, compatible with the observed distribution of F anions between normal and interstitial sites, and containing, respectively, one and two Th/sup 4 +/ cations, are proposed. In both clusters, Th/sup 4 +/ is 10-fold coordinated. Such clusters, which seem characteristic of large-size dopant cations, are suggested as possible defect-models for the Pb/sub 1-x/Th/sub x/F/sub 2+2x/solid solution.43 references, 6 figures, 3 tables.
- Research Organization:
- Laboratoire de Chimie Minerale Structurale, Limoges, France
- OSTI ID:
- 5895148
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 61:3; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Tue Aug 01 00:00:00 EDT 1989
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OSTI ID:7156698
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· Journal of Solid State Chemistry; (United States)
·
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Wed Feb 14 23:00:00 EST 2001
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OSTI ID:783962
Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISTRIBUTION
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
INTERSTITIALS
LATTICE PARAMETERS
MEDIUM TEMPERATURE
NEUTRON DIFFRACTION
NUMERICAL DATA
POINT DEFECTS
POWDERS
SCATTERING
SPATIAL DISTRIBUTION
THORIUM COMPOUNDS
THORIUM FLUORIDES
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISTRIBUTION
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
INTERSTITIALS
LATTICE PARAMETERS
MEDIUM TEMPERATURE
NEUTRON DIFFRACTION
NUMERICAL DATA
POINT DEFECTS
POWDERS
SCATTERING
SPATIAL DISTRIBUTION
THORIUM COMPOUNDS
THORIUM FLUORIDES