Valence states of 3d ions in lanthanum manganites-cobaltites, determined by X-ray spectroscopy
| Autor(en): | Galakhov, V.R. Melkozerova, M.A. Chupakhina, T.I. Bazuev, G.V. Raekers, M. Neumann, M. Molodtsov, S.L. |
Stichwörter: | Absorption spectroscopy; Calcium; Cobalt; Electrolysis; Ions; Lanthanum; Lanthanum alloys; Manganese; Manganese compounds; Manganites; Oxide minerals; Photoelectron spectroscopy; Spectrum analysis; Transition metals, Calcium concentrations; Citrate methods; Cobalt ions; Dopant concentrations; High temperatures; Lanthanum manganites; Mn ions; Nanostructured; Phase methods; Valence states; X-ray photoelectron spectroscopies, X ray photoelectron spectroscopy | Erscheinungsdatum: | 2008 | Journal: | Bulletin of the Russian Academy of Sciences: Physics | Volumen: | 72 | Ausgabe: | 10 | Startseite: | 1403 | Seitenende: | 1405 | Zusammenfassung: | The valence states of manganese and cobalt ions in lanthanum manganites-cobaltites La1-xCaxMn0.5 Co0.5O3 have been determined by 2p X-ray absorption and 3s X-ray photoelectron spectroscopies. The nanostructured P 1 manganite-cobaltite phase with the concentration x = 0, obtained by the citrate method at a temperature of 700°C, is characterized by a valence state of cobalt ions close to 2+ and a valence state of Mn ions of about 3.5+. The P2 phase at the same calcium concentration, synthesized by the high-temperature solid-phase method at a temperature of 1300°C, is characterized by a manganese valence of 3.5+ and a cobalt valence of about 2.3+. An increase in the dopant concentration leads to an increase in the average valence of 3d ions. © Allerton Press, Inc. 2008. |
ISSN: | 10628738 | DOI: | 10.3103/S1062873808100274 | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-57449094774&doi=10.3103%2fS1062873808100274&partnerID=40&md5=21fa019f0518d044e53392bba06ef7da |
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