Micro Raman,Mossbauer and magnetic studies of manganese substituted zinc ferrite nanoparticles: Role of Mn |
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| Institution: | 1. Microwave Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India;2. Institute of Geophysics and Planetology, University of Hawaii (UH), Honolulu, HI 96822, United States;3. UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452017, India;1. Laboratoire des Sciences et technique de l’Environnement et de la Valorisation, département de Génie des Procédés, Université de Mostaganem, Mostaganem, Algeria;2. Laboratoire de Science et Génie des Matériaux, USTHB, Alger, Algéria;3. Laboratory of LASIR Spectrochemistry, University of Science and Technology, 59650 Villeneuve d’Ascq, France;1. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;2. Department of Physics, Faculty of Science, Zagazig University, Zagazig, Egypt;1. Department of Physics, Goa University, Taleigao Plateau, Goa, 403206, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India;1. Department of Physics, Faculty of Sciences, University of Novi Sad, Trg D. Obradovi?a 4, 21000 Novi Sad, Serbia;2. Department of Materials Engineering, Faculty of Technology, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia;3. Faculty of Physics, University “Al. I. Cuza”, Bv. Carol I Nr 11, RO-Iasi 700506, Romania |
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| Abstract: | A series of Mn–Zn Ferrite nanoparticles (<15 nm) with formula MnxZn1?xFe2O4 (where x=0.00, 0.35, 0.50, 0.65) were successfully prepared by citrate-gel method at low temperature (400 °C). X-ray diffraction analysis confirmed the formation of single cubic spinel phase in these nanoparticles. The FESEM and TEM micrographs revealed the nanoparticles to be nearly spherical in shape and of fairly uniform size. The fractions of Mn2+, Zn2+ and Fe3+ cations occupying tetrahedral sites along with Fe occupying octahedral sites within the unit cell of different ferrite samples are estimated by room temperature micro-Raman spectroscopy. Low temperature Mossbauer measurement on Mn0.5Zn0.5Fe2O4 has reconfirmed the mixed spinel phase of these nanoparticles. Room temperature magnetization studies (PPMS) of Mn substituted samples showed superparamagnetic behavior. Manganese substitution for Zn in the ferrite caused the magnetization to increase from 04 to18 emu/g and Lande's g factor (estimated from ferromagnetic resonance measurement) from 2.02 to 2.12 when x was increased up to 0.50. The FMR has shown that higher Mn cationic substitution leads to increase in dipolar interaction and decrease in super exchange interaction. Thermomagnetic (M–T) and magnetization (M–H) measurements have shown that the increase in Mn concentration (up to x=0.50) enhances the spin ordering temperature up to 150 K (blocking temperature). Magnetocrystalline anisotropy in the nanoparticles was established by Mossbauer, ferromagnetic resonance and thermomagnetic measurements. The optimized substitution of manganese for zinc improves the magnetic properties and makes these nanoparticles a potential candidate for their applications in microwave region and biomedical field. |
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| Keywords: | Mn–Zn ferrite Nanoparticles Magnetic properties Mossbauer spectroscopy Raman analysis Ferromagnetic resonance |
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