Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/75547
Title: Magnetic properties and structure of TiO2-Mn (0.73 %) nanopowders: The effects of electron irradiation and vacuum annealing
Authors: Uymin, M. A.
Minin, A. S.
Yermakov, A. Y.
Korolyov, A. V.
Balezin, M. Y.
Sokovnin, S. Y.
Konev, A. S.
Konev, S. F.
Molochnikov, L. S.
Gaviko, V. S.
Demin, A. M.
Issue Date: 2019
Publisher: Institute for Metals Superplasticity Problems of Russian Academy of Sciences
Институт проблем сверхпластичности металлов Российской академии наук
Citation: Magnetic properties and structure of TiO2-Mn (0.73 %) nanopowders: The effects of electron irradiation and vacuum annealing / M. A. Uymin, A. S. Minin, A. Y. Yermakov et al. // Letters on Materials. — 2019. — Vol. 9. — Iss. 1. — P. 91-96.
Abstract: Nanopowder TiO2-0.73 % Mn was synthesized by the sol-gel method. Thermal treatment of the samples was carried out in vacuum at a temperature of 500°C. Magnetic properties were studied in the temperature range from 2 to 850 K. The effects of electron irradiation and vacuum annealing on the EPR spectra and magnetic properties of TiO2-Mn powder are discussed. It was established that a part of manganese ions in the anatase crystal lattice interacts antiferromagnetically, which causes a decrease in magnetization as compared to the result of the calculation for non-interacting ions. Vacuum annealing leads to the formation of oxygen vacancies and, at the same time, to a noticeable increase in the ferromagnetic contribution to magnetization, especially, after preliminary electron irradiation. We assume that the ferromagnetic contribution to the magnetization appears either due to incomplete compensation of antiferromagnetically directed moments of manganese ions, or due to positive exchange interactions of Mn ions via defects in the TiO2 lattice. It is shown that the temperature of magnetic disordering in samples with a spontaneous magnetic moment exceeds 600°C. © 2019, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.
Keywords: ELECTRON BEAM IRRADIATION
EPR
FERROMAGNETISM
TIO2-MN NANOPOWDERS
URI: http://hdl.handle.net/10995/75547
metadata.dc.rights: info:eu-repo/semantics/openAccess
RSCI ID: 37273228
SCOPUS ID: 85067234209
WOS ID: WOS:000460568200016
PURE ID: 9192080
ISSN: 2218-5046
DOI: 10.22226/2410-3535-2019-1-91-96
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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