XPS and NEXAFS studies of bismuth tantalate with pyrochlore structure doped with Cu/Co
Parshukova K. N. 1, Nekipelov S. V. 2, Koroleva A. V. 3, Lebedev A. M.4, Makeev B. A. , Korolev R. I. , Zhuk N. A.
1Syktyvkar State University, Syktyvkar, Russia
2Institute of Physics and Mathematics of the Komi Science Center UB RAS, Syktyvkar, Russia
3St. Petersburg State University, St. Petersburg, Russia
4National Research Center “Kurchatov Institute”, Moscow, Russia
The chemical state of metal cations in the pyrochlore Bi2Cu1/2Co1/2Ta2O9±δ (space group Fd-3m, a=10.5379(8) Angstrem) was characterized using XPS and NEXAFS spectroscopy. ased on the shift of the XPS Ta4f spectrum toward lower energies by 0.9 eV, the effective charge of tantalum cations +(5-δ) was determined. The NEXAFS Cu2p spectra of the pyrochlore represent a superposition of spectra from Cu(I) and Cu(II) cations. According to the analysis of relative peak intensities in the XPS Cu2p spectrum, the Cu(I)/Cu(II) ratio is 9/11. The nature of the NEXAFS and XPS Co2p spectra indicates the charge state Co(II,III). Keywords: pyrochlore, NEXAFS, XPS, 3d-elements, charge state of ions.
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