Diffusion in high-T/sub c/ superconductors
Conference
·
OSTI ID:6367835
The tracer diffusion of oxygen has been measured in the high T/sub c/ superconductors La/sub 2-x/Sr/sub x/CuO/sub 4/ (x = 0.1, 0.15, 0.2) and in YBa/sub 2/Cu/sub 3/O/sub 7-delta/, using secondary ion mass spectrometry (SIMS) to obtain the depth profiles. The diffusion coefficients in La/sub 2-x/Sr/sub x/CuO/sub 4/ decrease with increasing x, a result that is explained on the basis of a simple defect model, which also provides an explanation for the peak in the plot of T/sub c/ vs x. The depth profiles for YBa/sub 2/Cu/sub 3/O/sub 7-delta/ require two volume diffusion terms for a good fit, and this is explained in terms of the anisotropy of diffusion in this structure. The results are compared to values in the literature, and analyzed in terms of the theories of Bakker et al., Tu et al., and Ronay and Nordlander. 38 refs., 13 figs., 2 tabs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6367835
- Report Number(s):
- CONF-8903102-2; ON: DE89009792
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
ANNEALING
BARIUM COMPOUNDS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVEN-EVEN NUCLEI
HEAT TREATMENTS
IONS
ISOTOPE APPLICATIONS
ISOTOPES
LANTHANUM COMPOUNDS
LIGHT NUCLEI
MASS SPECTROSCOPY
NUCLEI
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHYSICAL PROPERTIES
POINT DEFECTS
RARE EARTH COMPOUNDS
SAMPLE PREPARATION
SPECTROSCOPY
STABLE ISOTOPES
STRONTIUM COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACANCIES
YTTRIUM COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
ANNEALING
BARIUM COMPOUNDS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVEN-EVEN NUCLEI
HEAT TREATMENTS
IONS
ISOTOPE APPLICATIONS
ISOTOPES
LANTHANUM COMPOUNDS
LIGHT NUCLEI
MASS SPECTROSCOPY
NUCLEI
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHYSICAL PROPERTIES
POINT DEFECTS
RARE EARTH COMPOUNDS
SAMPLE PREPARATION
SPECTROSCOPY
STABLE ISOTOPES
STRONTIUM COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACANCIES
YTTRIUM COMPOUNDS