XANES and EXAFS study of Au-substituted YBa sub 2 Cu sub 3 O sub 7 minus. delta

Conference · Mon Apr 01 04:00:00 EST 1991 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5101788

Ruckman, M W ^[1]; Hepp, A F ^[2]

---

1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
2. NASA Lewis Research Center, Cleveland, OH 44135 (United States)

The near-edge structure (XANES) of the Au L{sub 3} and Cu K edges of YBa{sub 2}Au{sub 0.3}Cu{sub 2.7}O{sub 7{minus}{delta}} has been studied. X-ray diffraction suggests that Au goes on the Cu(1) site and XANES shows that this has little effect on the oxidation state of the remaining copper. The gold L{sub 3} edge develops a white line feature whose position lies between that of trivalent gold oxide (Au{sub 2}O{sub 3}) and monovalent potassium gold cyanide (KAu(CN){sub 2}) and whose intensity relative to the edge step is smaller than in the two reference compounds. The L{sub 3} EXAFS for Au in the superconductor resembles that of Au{sub 2}O{sub 3}. However, differences in the envelope of the Fourier filtered component for the first shell suggest that the local structure of the AU in the superconductor is not equivalent to Au{sub 2}O{sub 3}.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5101788
• Report Number(s): CONF-900990--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 219:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FOURIER TRANSFORMATION
GOLD ADDITIONS
GOLD ALLOYS
HIGH-TC SUPERCONDUCTORS
INTEGRAL TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES