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Letters on MaterialsVolume 9, Issue 1, March 2019, Pages 91-96

Magnetic properties and structure of TiO2-Mn (0.73 %) nanopowders: The effects of electron irradiation and vacuum annealing(Article)(Open Access)

  • 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.
  • View Correspondence (jump link)
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  • aM. N. Miheev Institute of Metal Physics of Ural Branch of RAS, 18 S. Kovalevskaya St, Yekaterinburg, 620990, Russian Federation
  • bUral Federal University n. a. the first President of Russia B. N. Yeltsin, 19 Mir St, Yekaterinburg, 620002, Russian Federation
  • cInstitute of Electrophysics, Ural Branch of RAS, 106 Amundsena St, Yekaterinburg, 620016, Russian Federation
  • dUral State Forest Engineering University, 37 Sibirskii tract, Yekaterinburg, 620032, Russian Federation
  • ePostovsky Institute of Organic Synthesis, UB of RAS, 20 S. Kovalevskaya St, Yekaterinburg, 620990, Russian Federation

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.

Author keywords

Electron beam irradiationEPRFerromagnetismTiO2-Mn nanopowders

Funding details

Funding sponsor Funding number Acronym
Russian Academy of SciencesRAS

  • 1

    The X-ray investigations and magnetic measurements were performed at the Collective Use Test Center of Nanotechnologies and Advanced Materials (IMP UB RAS). IR spectra were measured at the Joint-Use Center for Spectroscopy and Analysis of Organic Compounds of the Postovsky Institute of Organic Synthesis of RAS (Ural Branch). The authors are grateful to S. I. Novikov for carrying out specific surface measurements. The research was carried out within the state assignment (themes “Magnet” and “Alloys”).

  • ISSN: 22185046
  • Source Type: Journal
  • Original language: English
  • DOI: 10.22226/2410-3535-2019-1-91-96
  • Document Type: Article
  • Publisher: Institute for Metals Superplasticity Problems of Russian Academy of Sciences

  Uymin, M.A.; M. N. Miheev Institute of Metal Physics of Ural Branch of RAS, 18 S. Kovalevskaya St, Yekaterinburg, Russian Federation;
© Copyright 2019 Elsevier B.V., All rights reserved.

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