Analyses of the grain boundary misorientation and oxygen content of bulk processed YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
Technical Report
·
OSTI ID:495819
- Brookhaven National Lab., Upton, NY (United States)
- State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering
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 (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 495819
- Report Number(s):
- BNL--64337; CONF-970302--14; ON: DE97006735
- Country of Publication:
- United States
- Language:
- English
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