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DOE OSTI2020

Materials Data on KAu(CN)2 by Materials Project

KAu(CN)2 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to six equivalent N3- atoms to form edge-sharing KN6 octahedra. There are three shorter (2.83 Å) and three longer (2.90 Å) K–N bond lengths. In the second K1+ site, K1+ is bonded to six equivalent N3- atoms to form edge-sharing KN6 octahedra. All K–N bond lengths are 2.85 Å. Au1- is bonded in a linear geometry to two equivalent C3+ atoms. Both Au–C bond lengths are 1.99 Å. C3+ is bonded in a distorted single-bond geometry to one Au1- and one N3- atom. The C–N bond length is 1.17 Å. N3- is bonded to three K1+ and one C3+ atom to form a mixture of distorted edge and corner-sharing NK3C tetrahedra.

36 MATERIALS SCIENCE↗

NASA NTRS1990

XANES and EXAFS study of Au-substituted YBa2Cu3O(7-delta)

The near-edge structure (XANES) of the Au L3 and Cu K edges of YBa2Au(0.3)Cu(2.7)O(7-delta) was 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 L3 edge develops a white line feature whose position lies between that of trivalent gold oxide (Au2O3) and monovalent potassium gold cyanide (KAu(CN)2) and whose intensity relative to the edge step is smaller than in the two reference compounds. The L3 EXAFS for Au in the superconductor resembles that of Au2O3. 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 Au2O3.

Ruckman, Mark W.↗