1st-6th September, 2019: International Conference on the Applications of the Mössbauer Effect, Dalian, China

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Z. Klencsar
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1st-6th September, 2019: International Conference on the Applications of the Mössbauer Effect, Dalian, China

Postby Z. Klencsar » Sat Jan 16, 2021 9:34 pm

The "International Conference on the Applications of the Mössbauer Effect" (ICAME 2019) was held during the days September 01 - 06, 2019, at the Dalian Institute of Chemical Physics, Dalian, China. On the conference Zoltán Klencsár presented a poster about the results achieved concerning the preparation and characterization of ZnFe2O4 nanoparticles considered for plant nutrition, with emphasis put on the effects of crystallinity regarding structural and magnetic properties of these spinel compounds. The work was summarized in an abstract as given below.

ZnFe2O4 nanoparticles with different crystallinity: a comparative study

Klencsár Z. 1, Kovács K.V. 1, Stichleutner S. 1, May Z. 2, Kuzmann E. 3,
Varga L.K. 4, Kiss L.F. 4, Nagy D.L. 4, Tolnai Gy. 5

1 - Centre for Energy Research, Hungarian Academy of Sciences, 1121 Budapest, Hungary
2 - Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Hungary
3 - Institute of Chemistry, ELTE Eötvös Loránd University, 1117 Budapest, Hungary
4 - Wigner Research Centre for Physics, Hungarian Academy of Sciences, 1121 Budapest, Hungary
5 - Kondorosi út 8/A, 1116 Budapest, Hungary


Zn-ferrite nanoparticles are widely studied on account of their intriguing electronic, magnetic and biology-related properties that make these materials promising candidates for being used in diverse applications such as hyperthermia therapy [1], MRI contrast agents [2], Li ion batteries [3], photocatalysis [4], as well as radar-absorbent [5], antimicrobial and anticancer materials [6]. While Zn2+ is known to have an affinity to be situated at the tetrahedral site of the spinel, when prepared in the nanoparticle form considerable levels of inversion are usually found, with corresponding changes in the magnetic properties of the material [7]. In the present work we investigate and compare structural and magnetic properties of two different Zn-ferrite nanoparticle powder samples, prepared via coprecipitation process, displaying similar (ca. 5 nm) particle size along with a considerable difference in crystallinity. Elemental composition of the samples is assessed by ICP-OES, whereas their structural and magnetic properties are explored through TEM, SAED, XRD, and FC/ZFC magnetization measurements, as well as electron magnetic resonance spectroscopy and 57Fe Mössbauer spectroscopy measurements performed at various temperatures. Via comparison of the experimental results relations among structural and magnetic properties are going to be discussed.

This work was supported by the Hungarian National Research, Development and Innovation Office – NKFIH (K115784 and K115913). Kovács K.V. has been supported by the János Bolyai Postdoctoral Fellowship of HAS.

1) P. Mendoza Zélis, G.A. Pasquevich, S.J. Stewart, M.B. Fernández van Raap, J. Aphesteguy, I.J. Bruvera, C. Laborde, B. Pianciola, S. Jacobo, F.H. Sánchez, J. Phys. D: Appl. Phys. 46, 125006 (2013).
2) C. Bárcena, A.K. Sra, G.S. Chaubey, C. Khemtong, J.P. Liu, J. Gao, Chem. Commun., 2224 (2008).
3) Y. Park, M. Oh, J.H. Kim, Energies 12, 304 (2019).
4) A. Behera, D. Kandi, S.M. Majhi, S. Martha, K. Parida, Beilstein J. Nanotechnol. 9, 436 (2018).
5) S. Tyagi, V.S. Pandey, H.B. Baskey, N. Tyagi, A. Garg, S. Goel, T.C. Shami, J. Alloys Compd. 731, 584 (2018).
6) E.S. Anooj, S.J. Sreelekshmi, S.T. Gopukumar, P.K. Praseetha, Int. J. Pharm. Sci. Rev. Res. 46, 22 (2017).
7) C. Upadhyaya, H.C. Vermaa, V. Satheb, A.V. Pimpale, J. Mag. Magn. Mater. 312, 271 (2007).

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