Preparation of superconducting YBa/sub 2/Cu/sub 3/O/sub 7/ from the corresponding metal formates

Journal Article · Tue Mar 01 00:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.3727· OSTI ID:5357478

Panayappan, R; Guy, Jr, J T; Binstead, R; LeToyrneau, V; Cooper, J C

Superconductive YBa/sub 2/Cu/sub 3/O/sub 7/ was prepared from a mixture of yttrium, barium, and copper (II) formates in flowing oxygen. The product was obtained by single-cycle heating to 920 /sup 0/C. Unlike conventional preparations, the orthorhombic phase is obtained without the requirement of an extended annealing period. Magnetic susceptibility measurements show the onset of superconductivity occurs at 95 K with a magnetic-flux expulsion of 5% at lower temperatures. X-ray powder diffraction data show the material to be predominantly the orthorhombic phase, with excess BaO impurity and none of the tetragonal phase present

• Research Organization: Chemistry and Material Sciences Divisions, US Naval Research Laboratory, Washington, DC 20375-5000
• OSTI ID: 5357478
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 37:7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
PRODUCTION
COPPER OXIDES
YTTRIUM OXIDES
ANNEALING
FORMATES
ORTHORHOMBIC LATTICES
SINTERING
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CARBOXYLIC ACID SALTS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
HEAT TREATMENTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
656100 - Condensed Matter Physics- Superconductivity