Unusual High Oxidation State of Iodine Intercalated in the Bi2Sr2CaCu2Ox Superconductor

Jin Ho Choy; Seong Gu Kang; Dong Hoon Kim; Seong Ju Hwang; Mitsuru Itoh; Yoshiyuki Inaguma; Tetsuro Nakamura

doi:10.1006/jssc.1993.1036

Unusual High Oxidation State of Iodine Intercalated in the Bi₂Sr₂CaCu₂O_x Superconductor

Jin Ho Choy, Seong Gu Kang, Dong Hoon Kim, Seong Ju Hwang, Mitsuru Itoh, Yoshiyuki Inaguma, Tetsuro Nakamura

Department of Materials Science and Engineering

Research output: Contribution to journal › Editorial › peer-review

Abstract

X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the (Bi-O) layers of the oxide superconductor Bi₂Sr₂CaCu₂O_x is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent I-O bonds as in KIO₄, not as in KIO₃. Electrons are transferred from the antibonding states of the covalent complex to the CuO₂ sheets, which lowers T_c. 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.

Original language	English
Pages (from-to)	284-287
Number of pages	4
Journal	Journal of Solid State Chemistry
Volume	102
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1993.1036
Publication status	Published - 1993 Jan

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1006/jssc.1993.1036

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title = "Unusual High Oxidation State of Iodine Intercalated in the Bi2Sr2CaCu2Ox Superconductor",

abstract = "X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the (Bi-O) layers of the oxide superconductor Bi2Sr2CaCu2Ox is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent I-O bonds as in KIO4, not as in KIO3. Electrons are transferred from the antibonding states of the covalent complex to the CuO2 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.",

author = "Choy, {Jin Ho} and Kang, {Seong Gu} and Kim, {Dong Hoon} and Hwang, {Seong Ju} and Mitsuru Itoh and Yoshiyuki Inaguma and Tetsuro Nakamura",

year = "1993",

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doi = "10.1006/jssc.1993.1036",

language = "English",

volume = "102",

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T1 - Unusual High Oxidation State of Iodine Intercalated in the Bi2Sr2CaCu2Ox Superconductor

AU - Choy, Jin Ho

AU - Kang, Seong Gu

AU - Kim, Dong Hoon

AU - Hwang, Seong Ju

AU - Itoh, Mitsuru

AU - Inaguma, Yoshiyuki

AU - Nakamura, Tetsuro

PY - 1993/1

Y1 - 1993/1

N2 - X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the (Bi-O) layers of the oxide superconductor Bi2Sr2CaCu2Ox is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent I-O bonds as in KIO4, not as in KIO3. Electrons are transferred from the antibonding states of the covalent complex to the CuO2 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.

AB - X-ray photoelectron spectroscopy (XPS) shows that iodine intercalated into the (Bi-O) layers of the oxide superconductor Bi2Sr2CaCu2Ox is present in a highly oxidized I(VII) state suggestive of the formation of strongly covalent I-O bonds as in KIO4, not as in KIO3. Electrons are transferred from the antibonding states of the covalent complex to the CuO2 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.

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Unusual High Oxidation State of Iodine Intercalated in the Bi₂Sr₂CaCu₂O_x Superconductor

Abstract

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