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research
Unconventional magnetism of non-uniform distribution of Co in TiO2 nanoparticles
Authors
D. W. Boukhvalov
V. R. Galakhov
+12 more
A. F. Gubkin
S. F. Konev
A. V. Korolev
V. V. Mesilov
A. S. Minin
L. S. Molochnikov
A. M. Murzakaev
E. V. Rosenfeld
M. A. Uimin
A. S. Volegov
A. Y. Yermakov
G. S. Zakharova
Publication date
1 January 2020
Publisher
Elsevier Ltd
Abstract
High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) analysis, electron paramagnetic resonance (EPR), X-ray absorption spectroscopy (XAS), magnetic methods, and density-functional theory (DFT) calculations were applied for the investigations of Co-doped anatase TiO2 nanoparticles (∼20 nm). It was found that high-spin Co2+ ions prefer to occupy the interstitial positions in the TiO2 lattice which are the most energetically favourable in compare to the substitutional those. A quantum mechanical model which operates mainly on two types of Co2+ – Co2+ dimers with different negative exchange interactions and the non-interacting paramagnetic Co2+ ions provides a satisfactorily description of magnetic properties for the TiO2:Co system. © 2020 Elsevier B.V.Russian Foundation for Basic Research. Ministry of Science and Higher Education of the Russian Federatio
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Electronic archive of the Ural State Forest Engineering University
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oai:elar.usfeu.ru:123456789/93...
Last time updated on 09/04/2020
HZB Repository
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oai:helmholtz.HZB:101558
Last time updated on 15/05/2020