Unusual high-spin ground state of Co3+ in octahedral coordination in brownmillerite-type cobalt oxide

Istomin, S.Y.; Tyablikov, O.A.; Kazakov, S.M.; Antipov, E.V.; Kurbakov, A.I.; Tsirlin, A.A.; Hollmann, N.; Chin, Y.Y.; Lin, H.J.; Chen, C.T.; Tanaka, A.; Tjeng, L.H.; Hu, Z.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.

Авторы: Istomin S.Ya, Tyablikov O.A., Kazakov S.M., Antipov E.V., Kurbakov A.I., Tsirlin A.A., Hollmann N., Chin Y.Y., Lin H.J., Chen C.T., Tanaka A., Tjeng L.H., Hu Z.
Журнал: Dalton Transactions
Том: 44
Год издания: 2015
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
Первая страница: 10708
Последняя страница: 10713
DOI: 10.1039/C4DT03670K
Аннотация: The crystal and magnetic structures of brownmillerite-like Sr2Co1.2Ga0.8O5 with a stable Co3+ oxidation state at both octahedral and tetrahedral sites were refined using neutron powder diffraction data collected at 2 K (S.G. Icmm, a=5.6148(6) Å, b=15.702(2) Å, c=5.4543(6) Å; Rwp=0.0339, Rp=0.0443, χ2=0.775). The very large tetragonal distortion of CoO6 octahedra (1.9591(4) Ǻ for Co-Oeq and 2.257(6) Ǻ for Co-Oax) could be beneficial for the stabilization of the long-sought intermediate-spin state of Co3+ in perovskite-type oxides. However, the large magnetic moment of octahedral Co3+ (3.82(7) μB) indicates the conventional high-spin state of Co3+ ions, which is further supported by the results of combined theoretical and experimental soft x-ray absorption spectroscopy study at the Co-L2,3 edges on Sr2Co1.2Ga0.8O5. High-spin ground state of Co3+ in Sr2Co1.2Ga0.8O5 resulted in much lower in comparison with LaCoO3 linear thermal expansion coefficient of 13.1 ppm K-1 (298-1073K) determined from high-temperature X-ray powder diffraction data collected in air.
Добавил в систему: Истомин Сергей Яковлевич

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Unusual high-spin ground state of Co3+ in octahedral coordination in brownmillerite-type cobalt oxideстатья

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