Study of Li-Al Ferrites by Nuclear Magnetic Resonance, UV-Spectroscopy, and Mossbauer Spectroscopy
| Authors | J. Mazurenko1, L. Kaykan2, A. Żywczak3, V. Kotsyubynsky4, Kh. Bandura1, M. Moiseienko1, A. Vytvytskyi1 |
| Affiliations |
1Ivano Frankivsk National Medical University, Halytska Str. 2, 76018Ivano-Frankivsk, Ukraine 2G.V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36 Acad. Vernadsky Blvd., 03142 Kyiv, Ukraine 3Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Krakiw, Poland 4Vasyl Stefanyk Precarpathian National University, 57, Shevchenko St., 76018 Ivano-Frankivsk, Ukraine |
| Е-mail | yumazurenko@ifnmu.edu.ua |
| Issue | Volume 15, Year 2023, Number 2 |
| Dates | Received 23 December 2022; revised manuscript received 16 April 2023; published online 27 April 2023 |
| Citation | J. Mazurenko1, L. Kaykan, et al., J. Nano- Electron. Phys. 15 No 2, 02020 (2023) |
| DOI | https://doi.org/10.21272/jnep.15(2).02020 |
| PACS Number(s) | 71.20.Nr, 72.15.Eb, 72.20.Pa,77.22.Gm, 73.22. – f, 76.80. + y |
| Keywords | Li ferrite, NMR (2) , Spinel, Nanocrystalline material (2) , Magnetic Properties (7) , Photo dye-degradation. |
| Annotation |
The paper presents the study of lithium ferrites substituted by aluminum ions by the methods of nuclear magnetic resonance (NMR), Mössbauer spectroscopy, and using a vibrating magnetometer of samples at room temperature. The resulting magnetic moment of the system depends both on the content of the substituting element and on the selective injection into the A or B sublattice. Al3+ and Li+ cations occupy octahedral (B) sites, while Fe3+ is distributed in both ones. Implementation of Al3+ in the B-position reduces the intensity of the IFNMR echo amplitude. Moreover, an increase in the aluminum content reduces the value of the magnetic superexchange field and causes rapid growth of the paramagnetic component (doublet in Mössbauer spectra). A decrease in saturation magnetization leads to a decrease in signal intensity. Our results showed that NMR and Mössbauer spectroscopy are complementary techniques for describing the magnetic properties of Li-Al ferrites in a wide range of frequencies. Studies of the degradation of methylene blue in an aqueous medium have shown that the synthesized ferrite can act as a photocatalyst operating in the visible light range. It is shown that the optical band gap and the degradation coefficient are inversely related. |
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