Synthesis of c-oriented YbBa{sub 2}Cu{sub 3}O{sub 7-{delta}} films on single and polycrystalline substrates by oxidation of liquid alloys
- Argonne National Lab., IL (United States)
- American Superconductor Corp., Watertown, MA (United States)
Textured superconducting films of YbBa{sub 2}Cu{sub 3}O{sub 7-{delta}} supported on single and polycrystalline substrates were prepared by oxidation of a liquid precursor alloy. The substrates were coated by dipping them into a molten alloy (YbBa{sub 2}Cu{sub 3}, m.p. {approximately}870{degree}C), withdrawing them from the melt, then oxidizing the adhering liquid alloy layer to the corresponding oxide phase, i.e., YbBa{sub 2}Cu{sub 3}O{sub 7-{delta}}. Samples prepared in this way exhibited a superconducting transition at {approximately}80 K following annealing in pure OP{sub 2} at 500{degree}C. With SrTiO{sub 3} (100) and MgO (100) substrates, evidence was seen for the epitaxial growth of YbBa{sub 2}Cu{sub 3}O{sub 7-{delta}} crystals having their c-axis parallel to the [100] direction of the substrate. For polycrystalline MgO, x-ray diffraction and microstructural examination showed that the high-{Tc} crystallites in the films were also oriented with their c-axis perpendicular to the substrate surface, but the a and b axes directions were randomly oriented rather than epitaxial.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10111953
- Report Number(s):
- ANL/CP-74977; CONF-911202-20; ON: DE92005189
- Resource Relation:
- Conference: Annual fall meeting of the Materials Research Society (MRS),Boston, MA (United States),2-6 Dec 1991; Other Information: PBD: Nov 1991
- Country of Publication:
- United States
- Language:
- English
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