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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:38 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Solid State Physics and Materials Science
Title:
Characterization of zinc ferrite nanopowders irradiated by slow highly charged ions
Authors:
Elena Vasilica GAFTON(1), Radu CIORCALAN(2), Martino TRASSINELLI (3), Ovidiu Florin CALTUN(1), Aurel PUI(2), Rolf HEMPELMANN(4), Dominique VERNHET(3)
Affiliation:
1) Alexandru Ioan Cuza University, Faculty of Physics, 11 Carol I Blv, Iasi 700506, Romania
2) Alexandru Ioan Cuza University, Faculty of Chemistry, 11 Carol I Blv, Iasi 700506, Romania
3CNRS and Université Pierre et Marie Curie, INSP, UMR7588, 4 Place Jussieu, F-75005 Paris, France
4Physikalische Chemie, Universitaet des Saarlandes, Saarbruecken, Germany
E-mail
gafton_vasilica@yahoo.com
Keywords:
spinel, zinc ferrite, nanoparticles, coprecipitation, HCI irradiation
Abstract:
Nanaoparticles and thin films of spinel zinc ferrite (ZnFe2O4) has attracted more attentions due to their particular magnetic properties and extraordinary gas sensing properties, mainly determined by their microstructure which can be affected by the synthesis conditions and methods. Tailoring of magnetic and structural properties of magnetic nanopowders by ion irradiation [1, 2] is a work of interest for technological application. To study the influence of lower energy irradiation process on physical properties of zinc ferrite nanoparticles a series of samples were obtained by coprecipitation route [3].
The influence of concentration of NaOH coprecipitation agent on synthesis process and on final properties of zinc ferrite nanoparticles was investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). It was observed that all samples are obtained in pure phases and the nanoparticles’ surface is activated with groups belonging to the surfactant. From TEM analysis the size distribution of the particles in between 7-10 nm was determined.
Structural and magnetic properties of these zinc ferrites nanoparticles were under investigation before and after being irradiated by a 90 keV neon beam. The XRD patterns and hysteresis loop at room temperatures were recorded for the pristine and irradiated specimens in order to observe the structural change and magnetic properties variation. It was observed that ion bombardment at such low energy does not affect the chemical composition but changed significantly their magnetic properties.
References:
[1] Rao, B.P., Rao, K.H., Subba Rao, P.S.V., Mahesh Kumar, A., Murthy, Y.L.N., Asokan, K., Siva Kumar, V.V., Kumar, R., Gajbhiye, N.S., Caltun, O.F, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Volume 244, Issue 1, February 2006, Pages 27-30 - Swift heavy ions irradiation studies on some ferrite nanoparticles
[2] Singh, J.P., Srivastava, R.C., Agrawal, H.M., Kumar, R., Radiation Effects and Defects in Solids, Volume 166, Issue 8-9, August 2011, Pages 564-570, 100MeV O7+ ion irradiation in nanosized zinc ferrite
[3] Gherca, D., Pui, A., Nica, V., Caltun, O., Cornei, N., Ceramics International, Volume 40, Issue 7 Part A, 2014, Pages 9599-9607, Eco-environmental synthesis and characterization of nanophase powders of Co, Mg, Mn and Ni ferrites
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