Point defects and oxygen diffusion in high T/sub c/ superconductors

Conference · Tue Nov 01 04:00:00 EST 1988

OSTI ID:6368379

Routbort, J L; Rothman, S J

This paper presents a review of the oxygen tracer diffusion data on the high-temperature oxide superconductors, La/sub 2-x/Sr/sub x/CuO/sub 4/ and YBa/sub 2/Cu/sub 3/O/sub 7-..gamma../ which have been obtained in our laboratory. The SIMS (Secondary Ion Mass Spectrometry) technique has been used to determine the depth profile of /sup 18/O from which the diffusion coefficient was calculated. Measurements in the La-Sr-Cu-O system have been performed for x = 0.1, 0.15 and 0.2 and the self-diffusion coefficient was found to decrease with increasing Sr substitution, a fact explained by a defect model in which oxygen vacancies are bound to Sr clusters. Recent measurements in polycrystals of Y-Ba-Cu-O were made in the temperature range of 300 to 600/degree/C at an oxygen partial pressure of 1 atmosphere; they are given by D = 9 /times/ 10/sup /minus/6/ exp -(0.89 eV/kT) cm/sup 2//s. 17 refs., 8 figs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6368379
• Report Number(s): CONF-881207-4; ON: DE89009842
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVEN-EVEN NUCLEI
HIGH TEMPERATURE
ISOTOPE APPLICATIONS
ISOTOPES
LANTHANUM COMPOUNDS
LIGHT NUCLEI
MASS SPECTROSCOPY
NUCLEI
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PARTIAL PRESSURE
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