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Title: Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra
Authors: Molochnikov, L. S.
Borodin, K. I.
Yermakov, A. E.
Uimin, M. A.
Minin, A. S.
Vostroknutova, A. V.
Eremina, R. M.
Kurkin, M. I.
Konev, S. F.
Konev, A. S.
Murzakayev, A. M.
Gaviko, V. S.
Issue Date: 2022
Publisher: Elsevier Ltd
Citation: Magnetism and temperature dependence of nano-TiO2: Fe EPR spectra / L. S. Molochnikov, K. I. Borodin, A. E. Yermakov [et al.] // Materials Chemistry and Physics. – 2022. – Vol. 276. – № 125327.
Abstract: Nanocrystalline TiO2 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-TiO2: Fe was studied by electron paramagnetic resonance (EPR) and Faraday balance. The existence of an inhomogeneous magnetic state in TiO2: 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 TiO2: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 TiO2: Fe system, mainly, dimers with a strong negative exchange interaction and isolated paramagnetic centers. No ferromagnetic state in TiO2: Fe-based samples after etching of aE-prepared state were detected. © 2021
Keywords: AFM-DIMERS
DOI: 10.1016/j.matchemphys.2021.125327
SCOPUS: 2-s2.0-85116739237
WoS: WOS:000711277800002
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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