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4 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1991

Near-edge study of gold-substituted YBa2Cu3O(7-delta)

The valence of Cu and Au in YBa2Au0.3Cu2.7O7-delta was investigated using x-ray absorption near edge structure (XANES). X-ray and neutron diffraction studies indicate that Au goes on the Cu(1) site and Cu K-edge XANES shows that this has little effect on the oxidation state of the remaining copper. The Au L3 edge develops a white line feature whose position lies between that of trivalent gold oxide and monovalent potassium gold cyanide, and whose height relative to the edge step is smaller than in the two reference compounds. The appearance of the Au L3 edge suggests that fewer Au 3d states are involved in forming the Au-O bond in YBa2Au0.3Cu2.7O7-delta than in trivalent gold oxide.

Ruckman, Mark W.↗
NASA NTRS1991

Near-edge study of gold-substituted YBa2Cu3O(7-delta)

The valence of Cu and Au in YBa2Au0.3Cu2.7O7-delta was investigated using X-ray absorption near edge structure (XANES). X-ray and neutron diffraction studies indicate that Au goes on the Cu(1) site and Cu K-edge XANES shows that this has little effect on the oxidation state of the remaining copper. The Au L3 edge develops a white line feature whose position lies between that of trivalent gold oxide and monovalent potassium gold cyanide, and whose height relative to the edge step is smaller than in the two reference compounds. The appearance of the Au L3 edge suggests that fewer Au 3d states are involved in forming the Au-O bond in YBa2Au0.3Cu2.7O7-delta than in trivalent gold oxide.

Ruckman, Mark W.↗
DOE OSTI2020

Materials Data on Au2O3 by Materials Project

Au2O3 crystallizes in the orthorhombic Fdd2 space group. The structure is three-dimensional. Au3+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Au–O bond distances ranging from 1.99–2.11 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a water-like geometry to two equivalent Au3+ atoms. In the second O2- site, O2- is bonded in a trigonal non-coplanar geometry to three equivalent Au3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Au3O by Materials Project

Au3O crystallizes in the hexagonal P6_3/mmc space group. The structure is one-dimensional and consists of two Au3O ribbons oriented in the (0, 0, 1) direction. Au+0.67+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. Both Au–O bond lengths are 2.40 Å. O2- is bonded to six equivalent Au+0.67+ atoms to form distorted face-sharing OAu6 pentagonal pyramids.

36 MATERIALS SCIENCE↗