Oxygen diffusion and phase transformation in YBa sub 2 Cu sub 3 O sub 7 minus x

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.343979· OSTI ID:5372871

Shi, D; Krucpzak, J; Tang, M; Chen, N; Bhadra, R ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)

Isothermal anneal experiments have been conducted over a wide temperature range from 300 to 900 {degree}C for polycrystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} samples in air. The phase transformation and oxygen contents of the annealed samples were studied and determined by x-ray diffraction and iodine titration. Oxygen diffusion coefficients at different temperatures were determined by a novel technique based on direct observation of the oxygen diffusion fronts by polarized light microscopy. The activation energy for the diffusion of oxygen in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} was obtained by an Arrhenius plot of the diffusion coefficients at different temperatures. The tetragonal-to-orthorhombic phase transformation controlled by oxygen diffusion is discussed.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5372871
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 66:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
DIFFRACTION
DIFFUSION
ELEMENTS
HALOGENS
HEAT TREATMENTS
HIGH TEMPERATURE
IODINE
ISOTHERMAL PROCESSES
MICROSCOPY
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLARIZATION
POLYCRYSTALS
QUANTITY RATIO
SCATTERING
TITRATION
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES