Effect of texture on grain boundary misorientation distributions in polycrystalline high temperature superconductors

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.116600· OSTI ID:278459

Goyal, A; Specht, E D; Kroeger, D M ^[1]; Mason, T A ^[2]

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1. Metals & Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Metals & Ceramics Division, Idaho National Engineering Laboratory, Idaho Falls, Idaho 83415-2050 (United States)

Computer simulations were performed to determine the most probable grain boundary misorientation distribution (GBMD) in model polycrystalline superconductors. GBMDs in polycrystalline superconductors can be expected to dictate the macroscopic transport critical current density, {ital J}{sub {ital c}}. Calculations were performed by simulating model polycrystals and then determining the GBMD. Such distributions were calculated for random materials having cubic, tetragonal, and orthorhombic crystal symmetry. In addition, since most high temperature superconductors are tetragonal or pseudotetragonal, the effect of macroscopic uniaxial and biaxial grain orientation texture on the GBMD was determined for tetragonal materials. It is found that macroscopic texture drastically alters the grain boundary misorientation distribution. The fraction of low angle boundaries increases significantly with uniaxial and biaxial texture. The results of this study are important in correlating the macroscopic transport {ital J}{sub {ital c}} with the measured grain orientation texture as determined by x-ray diffraction {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 278459
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 68; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPUTERIZED SIMULATION
CRITICAL CURRENT
GRAIN BOUNDARIES
GRANULAR MATERIALS
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
POLYCRYSTALS
TEXTURE