The influence of nonstoichiometry on the electronic structure of Li 1+xCoO2 (0 < x ≤ 0.1) superstoichiometric oxides / Kaichev V.V., Kosova N.V., Devyatkina E.T., Bukhtiyarov V.I., Kellerman D.G. // Russian Journal of Physical Chemistry A. - 2003. - V. 77, l. 8. - P. 1319-1323.

ISSN:

00360244

Type:

Article

Abstract:

Li1+xCoO2 (0 ≤ x ≤ 0.1) samples prepared by the traditional ceramic technique were studied by X-ray diffraction, IR spectroscopy, X-ray photoelectron spectroscopy, diffuse reflectance electron spectroscopy, and magnetic measurements. The superstoichiometric oxides had a uniform crystal structure with statistically distributed vacancies in cobalt layers and an enhanced covalence of Co-O bonds. Excess lithium caused the appearance of a new oxygen state (O-) different from the oxide state (O2-) rather than the reduction of Co3+ ions to Co 2+. The appearance of oxygen ions with an unusually low electron density was directly related to the formation of oxygen positions with a decreased coordination number; the magnetic properties of Li 1+xCoO2 were governed by exchange-coupled (Co 3+-O-) pairs.

Author keywords:

Index keywords:

cobalt derivative; lithium derivative; nonstoichiometric compound; oxide; oxygen derivative; article; ceramics; chemical analysis; chemical structure; covalent bond; crystal structure; density; diffus

DOI:

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141852071&partnerID=40&md5=155cb335a3d0a8e74f5a3898177b71a4
Affiliations	Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 5, Novosibirsk, 630090, Russian Federation; Inst. Solid-Stt. Chem./M., Siberian Division, Russian Academy of Sciences, Novosibirsk, Russian Federation; Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620219, Russian Federation
Chemicals/CAS	oxide, 16833-27-5
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Correspondence Address	Kaichev, V.V.; Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 5, Novosibirsk, 630090, Russian Federation; email: kosova@solid.nsc.ru
Language of Original Document	English
Abbreviated Source Title	Russ. J. Phys. Chem. A
Source	Scopus