Resistance measurements and oxygen out-diffusion near the orthorhombic-tetragonal phase transformation in single-crystal YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.441· OSTI ID:6073345

LaGraff, J R; Han, P D; Payne, D A ^[1]

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1. Department of Materials Science and Engineering and Materials Research Laboratory, The University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (US)

Isothermal resistance measurements and hot-stage optical microscopy were used to simultaneously follow the loss of oxygen and the disappearance of the twin structure in single-crystal YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} from 590--720{degree}C. Oxygen out-diffusion was found to follow surface-reaction-limited conditions with an activation energy of 1.2{plus minus}0.1 eV. Although the crystal was driven through the orthorhombic-tetragonal phase transformation during the isothermal anneals, no anomalous resistance behavior was observed. This suggests that previous observations of anomalous resistance behavior in bulk ceramics may not be intrinsic to YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. The difference between oxygen in-diffusion and out-diffusion kinetics is discussed in relation to the twin structure observed near the orthorhombic-tetragonal phase transformation.

• OSTI ID: 6073345
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:1; ISSN 0163-1829; ISSN PRBMD
• 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
ATOM TRANSPORT
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HIGH TEMPERATURE
HIGH-TC SUPERCONDUCTORS
MICROSCOPY
MONOCRYSTALS
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
OPTICAL MICROSCOPY
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RADIATION TRANSPORT
SUPERCONDUCTORS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
TWINNING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES