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Опубликовано 2014-09-14 Опубликовано на SciPeople2014-10-08 17:58:33 ЖурналAppl. Phys. A


X-ray spectra and valence states of cations in nanostructured half-doped La0.5Ca0.5MnO3 manganite
V. R. Galakhov, V. V. Mesilov, S. N. Shamin, B. A. Gizhevskii, N. A. Skorikov, S. V. Naumov, O. Yu. Vilkov / Виталий Месилов
DOI 10.1007/s00339-014-8774-8.
Аннотация Soft X-ray absorption (XAS) and emission (XES) spectroscopies were applied to determine valence states of manganese ions in nanostructured powder of halfdoped La0:5Ca0:5MnO3 manganite obtained by milling in a ball mill. XAS spectra were measured both in surfacesensitivity total electron-yield and in bulk-sensitivity total fluorescence-yield modes. O Ka XES and O 1s XAS spectra characterized the occupied and unoccupied partial O 2p densities of states are compared with band-structure calculations made using the TB-LMTO-ASA codes. Experimental Mn 2p, Ca 2p, and La 3d XAS spectra are compared with results of crystal field atomic multiplet calculations. For the nanostructured system of La0:5Ca0:5MnO3, concentrations of Mn4þ ions are found to be increased with increasing the time of milling.

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