Oxygen tracer diffusion in YBa[sub 2]Cu[sub 4]O[sub 8]

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.7505· OSTI ID:6266697

Routbort, J L; Rothman, S J; Mundy, J N ^[1]; Baker, J E ^[2]; Dabrowski, B ^[3]; Williams, R K ^[4]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801 (United States)
3. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)
4. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

Oxygen tracer diffusion has been measured in YBa[sub 2]Cu[sub 4]O[sub 8] (Y 1:2:4) polycrystals over a temperature range of 400 to 700 [degree]C in oxygen partial pressures ([ital P][sub O2]) that varied between 10[sup 3] and 10[sup 5] Pa. Depth profiles were determined by secondary-ion mass spectrometry. The results can be described by an Arrhenius relationship with a pre-exponential of 0.08 cm[sup 2]/s and an activation energy of 201 kJ/mole. The diffusion coefficient is a strong function of [ital P][sub O2], increasing as [ital P][sub O2] decreases. Oxygen diffuses several orders of magnitude more slowly in Y 1:2:4 than in YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] Y 1:2:3 with a higher pre-exponential and higher activation energy, and the clear dependence on [ital P][sub O2] indicates that diffusion of oxygen in polycrystalline Y 1:2:4 occurs by a different mechanism than in Y 1:2:3. The results of tracer measurements performed at 600 and 700 [degree]C on Y 1:2:4 [ital c]-axis single crystals indicate that diffusion in the [ital c] direction is at least 100 times slower than diffusion in the polycrystals and has a larger activation energy.

• DOE Contract Number: W-31109-ENG-38; AC02-76ER01198; AC05-84OR21400
• OSTI ID: 6266697
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:10; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DIFFUSION
ELEMENTS
HIGH-TC SUPERCONDUCTORS
ISOTOPE APPLICATIONS
MONOCRYSTALS
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLYCRYSTALS
RADIATION TRANSPORT
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES