Materials Chemistry and Physics, volume 276, pages 125327

Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra

Molochnikov Leonid S. ¹

D Konev Stepan

Minin A.S. ^{2, 3}

Gaviko V.S ^{3, 4}

Uimin M.A. ^{2, 3}

Borodin K I ^{2, 3}

Yermakov A.Y. ^{2, 3}

Vostroknutova A V ⁵

Eremina R. M. ⁵

Kurkin M.I. ⁶

Konev Aleksandr ^{2, 3}

Murzakaev Aidar M ^{3, 4}

Konev S.F. ⁶

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Ural State Forest Engineering University, Yekaterinburg, 620100, Russia |

M. N. Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, 620108, Russia |

Ural Federal University, Yekaterinburg, 620002, Russia |

⁴

Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, 620016, Russia |

⁵

Zavoisky Physical-Technical Institute, Federal Research Center “Kazan Scientific Center of RAS”, Kazan, 420029, Russia

Kazan Scientific Center of the Russian Academy of Sciences

Kazan E.K. Zavoisky Physical-Technical Institute of the Kazan Scientific Center of the Russian Academy of Sciences

⁶

M. N. Mikheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Yekaterinburg 620108, Russia |

Publication type: Journal Article

Publication date: 2022-01-01

Elsevier

Journal: Materials Chemistry and Physics

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Impact factor: 4.6

ISSN: 02540584

DOI: 10.1016/j.matchemphys.2021.125327

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Condensed Matter Physics

General Materials Science

Abstract

Nanocrystalline TiO 2 samples of various compositions (up to 5 at.% Fe) with anatase structure and an average particle size of about 20 nm were synthesized using sol-gel technology. The magnetic properties of nano-TiO 2 : Fe was studied by electron paramagnetic resonance (EPR) and Faraday balance. The existence of an inhomogeneous magnetic state in TiO 2 : Fe samples of different compositions were revealed by EPR spectroscopy in a wide temperature range. The analysis of the EPR spectra in the L -, X - and Q-bands allowed us to calculate the quadratic fine structure (D, E) parameters, “axial” and “rhombic” ones, respectively. The value of D turned out to be quite small, which indicates an insignificant anisotropy, which can be ignored describing the magnetic properties of TiO 2 :Fe. It was shown that the temperature behavior of different separate components of the integral EPR spectra can be qualitatively interpreted in the model of coexistence in the TiO 2 : Fe system, mainly, dimers with a strong negative exchange interaction and isolated paramagnetic centers. No ferromagnetic state in TiO 2 : Fe-based samples after etching of aE-prepared state were detected. • EPR spectra of nano-TiO2:Fe display a heterogeneous magnetic state. • Decomposition of EPR signals provides information on different magnetic states of iron ions. • The anisotropic contribution is negligible compared to the value of the exchange interaction.

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Catalysis Science and Technology	Catalysis Science and Technology, 1, 25% Catalysis Science and Technology 1 publication, 25%
Current Materials Science	Current Materials Science, 1, 25% Current Materials Science 1 publication, 25%
Magnetochemistry	Magnetochemistry, 1, 25% Magnetochemistry 1 publication, 25%
Advanced Optical Materials	Advanced Optical Materials, 1, 25% Advanced Optical Materials 1 publication, 25%
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Multidisciplinary Digital Publishing Institute (MDPI)	Multidisciplinary Digital Publishing Institute (MDPI), 1, 25% Multidisciplinary Digital Publishing Institute (MDPI) 1 publication, 25%
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Molochnikov L. S. et al. Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra // Materials Chemistry and Physics. 2022. Vol. 276. p. 125327.

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Molochnikov L. S., Borodin K. I., Yermakov A., Uimin M., Minin A., Vostroknutova A. V., Eremina R. M., Kurkin M., D Konev S., Konev A., Murzakaev A. M., Gaviko V., Konev S. Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra // Materials Chemistry and Physics. 2022. Vol. 276. p. 125327.

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RIS Copy

TY - JOUR

DO - 10.1016/j.matchemphys.2021.125327

UR - https://doi.org/10.1016%2Fj.matchemphys.2021.125327

TI - Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra

T2 - Materials Chemistry and Physics

AU - Molochnikov, Leonid S.

AU - Borodin, K I

AU - Yermakov, A.Y.

AU - Uimin, M.A.

AU - Minin, A.S.

AU - Vostroknutova, A V

AU - Eremina, R. M.

AU - Kurkin, M.I.

AU - D Konev, Stepan

AU - Konev, Aleksandr

AU - Murzakaev, Aidar M

AU - Gaviko, V.S

AU - Konev, S.F.

PY - 2022

DA - 2022/01/01 00:00:00

PB - Elsevier

SP - 125327

VL - 276

SN - 0254-0584

ER -

BibTex

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BibTex Copy

@article{2022_Molochnikov,

author = {Leonid S. Molochnikov and K I Borodin and A.Y. Yermakov and M.A. Uimin and A.S. Minin and A V Vostroknutova and R. M. Eremina and M.I. Kurkin and Stepan D Konev and Aleksandr Konev and Aidar M Murzakaev and V.S Gaviko and S.F. Konev},

title = {Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra},

journal = {Materials Chemistry and Physics},

year = {2022},

volume = {276},

publisher = {Elsevier},

month = {jan},

url = {https://doi.org/10.1016%2Fj.matchemphys.2021.125327},

pages = {125327},

doi = {10.1016/j.matchemphys.2021.125327}

}

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Publisher

Elsevier

Journal

Materials Chemistry and Physics

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Quartile WOS

Impact factor

4.6

ISSN

02540584 (Print)

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Laboratory of Applied Magnetism

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