Formation of tetragonal YBa2Cu3O7−δ from an undercooled melt
- 1 January 1994
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 9 (1) , 1-3
- https://doi.org/10.1557/jmr.1994.0001
Abstract
Containerless processing of YBa2Cu3O7−δ was performed using an aero-acoustic levitation technique. Upon solidification from the liquid, spheres of size 2.5 mm diameter undercooled and recalesced, forming tetragonal YBa2Cu3O7−δ directly from the melt. Subsequent to solidification processing, these samples were annealed to single phase YBa2Cu3O7−δ with orthorhombic symmetry as indicated by powder XRD, SQUID magnetometer measurements indicate a sharp superconducting transition at approximately 85 K. Magnetic Jc values, calculated using the Bean critical state model, indicate that the spheres can carry critical current densities on the order of 104 A cm−2. Microstructural characterization has been performed on both the as-solidified and annealed spheres.Keywords
This publication has 6 references indexed in Scilit:
- Containerless solidification of YBa2Cu3O7-x in a drop tubeJournal of Materials Research, 1993
- Containerless processing and rapid solidification of Nb-Si alloys of hypereutectic compositionMetallurgical Transactions A, 1991
- Melt-spin processing of YBa2Cu3O7−xJournal of Materials Research, 1991
- Formation of microstructure in rapidly solidified materials and its effect on propertiesMaterials Science and Engineering: A, 1991
- Undercooling studies on Nb-Pt and Nb-Si alloys using the 105 meter drop tubeAdvances In Space Research, 1988
- Magnetization of Hard SuperconductorsPhysical Review Letters, 1962