Analyses of the grain boundary misorientation and oxygen content of bulk processed YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
Conference
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OSTI ID:20015532
The grain boundary misorientation distribution of 203 grain boundaries in bulk processed high Tc superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with five processing conditions;, was studied. Two complementary analytical approaches, Grain Boundary Misorientation Distribution (GBMD) from the random description, using a hypothesis test and {chi}{sup 2} analysis, and Grain Boundary Character Distribution (GBCD), using the Coincidence Site Lattice (CSL) model, were applied. The GBMD and GBCD both showed grain boundary evolution departing from a random distribution above 935 C processing temperature. The GBCD analyses indicated an approximately linear increase in the population of CSL-related boundaries, among which the tetragonal CSL (c/a {ne} 3) boundaries grew in the same trend while orthorhombic boundaries (c/a = 3) became stagnated. The results from comparing the corresponding GBCD and volume averaged J{sub c} for each batch indicated that the tetragonal CSL boundaries were oxygen deficient and accounted for, among other current limiting factors, lower current carrying ability.
- Research Organization:
- Brookhaven National Lab., Upton, NY (US)
- Sponsoring Organization:
- US Department of Energy
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 20015532
- Country of Publication:
- United States
- Language:
- English
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