Unusual high oxidation state of iodine intercalated in the Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub x] superconductor

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1036· OSTI ID:6839291

Choy, Jinho; Kang, Seonggu; Kim, Donghoon; Hwang, Seongju ^[1]; Itoh, Mitsuru; Inaguma, Yoshiyuki; Nakamura, Tetsuro ^[2]

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1. Seoul National Univ. (Korea, Republic of)
2. Tokyo Institute of Technology, Yokohama (Japan)

X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the (Bi-O) layers of the oxide superconductor Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub x] is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent I-O bonds as in KIO[sub 4], not as in KIO[sub 3]. Electrons are transferred from the antibonding states of the covalent complex to the CuO[sub 2] sheets, which lowers [Tc]. The core-level spectra also show the presence of residual iodine species at the surface of the samples. Ar-ion sputtering of the surface disintercalates iodine from the bulk to the surface.

• OSTI ID: 6839291
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 102:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON SPECTROSCOPY
ELEMENTS
HALOGENS
IODINE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
SPECTROSCOPY
SPUTTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
VALENCE
X-RAY SPECTROSCOPY