Anisotropy of oxygen tracer diffusion in single-crystal YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.2326· OSTI ID:5420313

Rothman, S J; Routbort, J L; Welp, U ^[1]; Baker, J E ^[2]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois (USA)
2. Center for Microanalysis of Materials, University of Illinois, Urbana, Illinois (USA)

Oxygen tracer diffusion has been measured in single-crystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} from 300 to 650 {degree}C in the {ital c} direction, at a few temperatures in the {ital ab} plane of twinned crystals, and in the {ital b} direction of an untwinned crystal. The diffusion coefficient in the {ital c} direction, {ital D}{sub {ital c}}, is {approx}10{sup 6} lower than the diffusion coefficient in polycrystals at 400 {degree}C and diffusion in the {ital b} direction is at least 100 times faster than diffusion in the {ital a} direction at 300 {degree}C. The oxygen diffusion coefficient in polycrystals is, within an experimental uncertainty of a factor of 2, independent of oxygen partial pressure at 400 {degree}C, in agreement with previous results measured at 600 {degree}C. Some suggestions are presented on the mechanism of diffusion, the relation of diffusion and internal friction in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, and on the meaning of the activation energy.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5420313
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:5; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
ANISOTROPY
ARRHENIUS EQUATION
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFUSION
ENERGY
EQUATIONS
FRICTION
HIGH-TC SUPERCONDUCTORS
INTERNAL FRICTION
IONS
ORGANIC COMPOUNDS
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
OXYGEN IONS
POINT DEFECTS
QUATERNARY COMPOUNDS
SUPERCONDUCTORS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
VACANCIES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES