The defect structure of ion and neutron irradiated YBa sub 2 Cu sub 3 O sub 7-. delta. single crystals

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6911435

Frischherz, M C ^[1]; Kirk, M A; Liu, J Z ^[2]; Zhang, J P ^[3]; Weber, H W ^[4]

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1. Argonne National Lab., IL (USA) Science and Technology Center for Superconductivity (USA)
2. Argonne National Lab., IL (USA)
3. Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science Science and Technology Center for Superconductivity (USA)
4. Atominstitut der Oesterreichischen Universitaeten, Vienna (Austria)

Using transmission electron microscopy techniques, we have begun a program to study cascade defects in the high-{Tc} superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. In situ ion irradiations in the High Voltage Electron Microscope (HVEM)-Accelerator Facility at Argonne National Laboratory were performed to simulate low dose neutron irradiation at both room temperature and 40 K. Diffraction contrast experiments performed in two-beam dark field conditions in different operating reflections indicated defect cascades with hydrostatic pressure-like strain fields. Visible cascade defect yields ranged from 0.3 {minus} 1.0, depending on incident ion mass. High resolution micrographs revealed that at least some of these cascades have recrystallized regions that have rotated with respect to the surrounding lattice. Samples which were neutron irradiated to doses sufficient to produce overlapped cascades show a cellular' structure of good crystalline material surrounded by highly defective or amorphous cell walls. It is suggested that the recrystallization observed in isolated cascade defects produced by low dose ion irradiation provides the mechanism for the formation of the cellular structure at high damage levels. Correlation of microstructure with magnetic measurements of critical current density increased by neutron irradiation and electrical resistivity measurements of the superconducting to insulating transition under ion irradiation are suggested. 15 refs., 4 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER; National Science Foundation (NSF)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6911435
• Report Number(s): CONF-900623-4; ON: DE90010100; CNN: STC-8809854; TRN: 90-012995
• Resource Relation: Conference: 15. symposium on effects of radiation on materials, Nashville, TN (USA), 17-21 Jun 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
PHYSICAL RADIATION EFFECTS
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
YTTRIUM OXIDES
CASCADE THEORY
CRYSTAL DEFECTS
CRYSTALS
KRYPTON IONS
NEUTRONS
XENON IONS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARYONS
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
ELEMENTARY PARTICLES
FERMIONS
HADRONS
IONS
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
RADIATION EFFECTS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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