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57Fe NMR study of layered chalcogenide Fe7S8
Russian version
Kashnikova M.E. 1,2, Utkin N. A. 1,2, Ogloblichev V. V. 1, Sadykov A. F. 1, Smolnikov A.G. 1, Piskunov Yu. V. 1, Arapova I. Yu. 1, Selezneva N. V. 2, Baranov N. V. 1,2
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
Email: ogloblichev@imp.uran.ru, sadykov@imp.uran.ru, smolnikov@imp.uran.ru, piskunov@imp.uran.ru, arapova@imp.uran.ru, n.v.selezneva@urfu.ru, baranov@imp.uran.ru
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The paper presents the results of a nuclear magnetic resonance (NMR) study of the magnetically ordered phase of layered chalcogenide Fe7S8 (pyrrhotite) on iron nuclei 57Fe in a zero external magnetic field in the temperature range T=4.2-295 K. The obtained NMR spectra on the 57Fe nuclei represent several lines in the frequency range Δν=30-50 MHz. The absence of iron ions in the Fe3+ state in Fe7S8 is proven. The presence of several magnetically nonequivalent positions of iron ions, differing in the number and location of vacancies near them, is detected. The rates of spin-spin and spin-lattice relaxation of the nuclear magnetic moments of 57Fe are measured in different frequency regions of the spectrum at different temperatures. Local magnetic fields on iron nuclei are determined and the magnetic moment of Fe ions is estimated. It is shown that the 57Fe spectra in the Fe7S8 chalcogenide can be interpreted in the 4C-type superstructure model. The results obtained in this work expand the prospects for the use of NMR spectroscopy in the mining industry, in particular in the detection, separation and real-time selection of ore fragments containing pyrrhotite Fe7S8. Keywords: transition metal chalcogenides, layered defective structure, nuclear magnetic resonance, 57Fe, pyrrhotite, local magnetic field, 4C-type structure.
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