X-ray absorption spectroscopic study of new high-{Tc} superconducting intercalation compound of (HgX{sub 2}){sub 0.5}Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} (X = Br,I)

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:549858

Choy, J H; Park, N G; Hwang, S J; Hwang, S H; Kim, D H ^[1]

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1. Seoul National Univ. (Korea, Republic of)

The authors have systematically performed X-ray absorption spectroscopic (XAS) studies on the new mercuric halide intercalated superconductors, (HgX{sub 2}){sub 0.5}Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} with X = Br and I, in order to investigate the electronic and crystal structure of these compounds. The present Hg L{sub III}-edge EXAFS results indicate that the mercury is coordinated with two bromide or iodide ligands with bond length of 2.46 {angstrom} for the HgBr{sub 2}-intercalate and 2.65 {angstrom} for the HgI{sub 2}-one. This is the first example of linear molecular salt of HgX{sub 2} stabilized in the solid lattice. According to the I L{sub I}- and Br K-edge X-ray absorption near edge structure (XANES) spectroscopic studies, a small amount of electron transfer from the intercalant HgX{sub 2} to the host lattice could be observed upon intercalation, resulting in the negatively charged state of (HgX{sub 2}){sup {delta}{minus}}. The Cu K-edge EXAFS analysis reveals that the bond distance of Cu-O{sub axial} is slightly shortened upon intercalation, reflecting the oxidation of (Cu-O) layer, which is well consistent with the I L{sub I}- and Br K-edge XANES results.

• OSTI ID: 549858
• Report Number(s): CONF-960163--; ISBN 0-8194-2070-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
BISMUTH OXIDES
CALCIUM OXIDES
CLATHRATES
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
MERCURY BROMIDES
MERCURY IODIDES
STRONTIUM OXIDES
SUPERCONDUCTIVITY