Self-diffusion of /sup 45/Ca and /sup 88/Y in pure and YF/sub 3/-doped CaF/sub 2/ single crystals
Journal Article
·
· J. Am. Ceram. Soc.; (United States)
Tracer self-diffusion coefficients for Ca and Y were measured in pure and YF/sub 3/-doped CaF/sub 2/ crystals for dopant levels ranging from 2 to 10 mol % and temperatures between 960/degree/ and 1212/degree/C. Coefficients for both cations increased approximately linearly with the square of the dopant concentration at constant temperature. The activation energies for diffusion of both cations decreased with increasing dopant concentration. Atomic jump pathways are considered, and the decrease in activation energy is explained in terms of reduction in the enthalpy of motion accompanying the formation of Willis anion defect clusters in the more heavily doped crystals. 28 refs.
- Research Organization:
- Iowa State Univ, Ames, USA
- OSTI ID:
- 6714552
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 64:10; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Self-diffusion of calcium and yttrium in pure and YF/sub 3/-doped CaF/sub 2/ single crystals
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Sun Jul 01 00:00:00 EDT 1979
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OSTI ID:5491424
Interdiffusion in the CaF/sub 2/--YF/sub 3/ system
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Tue Dec 31 23:00:00 EST 1974
· J. Am. Ceram. Soc.; (United States)
·
OSTI ID:7195553
STUDIES OF ABNORMALLY MIXED CaF$sub 2$-CeF$sub 3$ AND CaF$sub 2$-YF$sub 2$ CRYSTALS IN CaF$sub 2$ MELTS
Journal Article
·
Mon Dec 31 23:00:00 EST 1962
· Radiokhimiya (U.S.S.R.) For English translation see Sov. Radiochem. (Engl. Transl.)
·
OSTI ID:4130187
Related Subjects
36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM 45
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CALCIUM ISOTOPES
CRYSTAL DOPING
CRYSTALS
DAYS LIVING RADIOISOTOPES
DIFFUSION
DOPED MATERIALS
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATERIALS
MONOCRYSTALS
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SELF-DIFFUSION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM 88
YTTRIUM COMPOUNDS
YTTRIUM FLUORIDES
YTTRIUM ISOTOPES
360601* -- Other Materials-- Preparation & Manufacture
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM 45
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CALCIUM ISOTOPES
CRYSTAL DOPING
CRYSTALS
DAYS LIVING RADIOISOTOPES
DIFFUSION
DOPED MATERIALS
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATERIALS
MONOCRYSTALS
NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SELF-DIFFUSION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM 88
YTTRIUM COMPOUNDS
YTTRIUM FLUORIDES
YTTRIUM ISOTOPES