A Study of Magnetic Properties of Manganite Substituted ZnFe 2 O 4 Composites
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ORIGINAL PAPER
A Study of Magnetic Properties of Manganite Substituted ZnFe2 O4 Composites S. Bharadwaj1 · Subimal Deb1 · A. Tirupathi2 · Y. Kalyana Lakshmi2,3 Received: 7 May 2020 / Accepted: 28 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Composites of ZnFe2 O4 /La0.67 Sr0.33 MnO3 with different weight percentages were synthesized using sol-gel method and their magnetic behavior was investigated. Powder X-ray diffraction studies show spinel structure for zinc ferrite and rhombohedral for La0.67 Sr0.33 MnO3 . An additional minor phase of α−Fe2 O3 and ZnO was also noticed in zinc ferrite suggesting non-stoichiometric nature. Fourier transform infrared spectroscopy studies display cohabitation of two phases belonging to ferrite and perovskite phase with varying peak intensities. Field-dependent magnetization measurement at room temperature shows partial variation in saturation magnetization and remanent magnetization values with increase in shows single peak with smooth variation, La0.67 Sr0.33 MnO3 weight percent in zinc ferrite. Except for zinc ferrite, dM dH pointing to easy rotation of magnetic dipoles under applied fields. Keywords Composites · Zinc ferrites · Manganite · Magnetic properties ·
1 Introduction From the last few decades, lots of efforts were made by several research groups in developing magnetic materials with low cost, ecofriendly and enhanced physical properties emerging for practical applications. Ferrites are an important class of magnetic materials which exhibit excellent physical properties. Among spinel ferrites, zinc ferrite (ZF) is suitable for a wide range of applications such as gas sensing [1], supercapacitor [2], magnetic catalyst [3], adsorption [4] and photocatalysis [5]. Zinc ferrites exhibit paramagnetic behavior at room temperature [6]. It is often reported that magnetic properties are mainly dependent on grain size and synthesis conditions. Chinnaswamy et al. Y. Kalyana Lakshmi
[email protected] S. Bharadwaj [email protected] 1
Department of Physics, GIS, GITAM (Deemed to be University), Vishakapatnam, A.P, 530045, India
2
Department of Physics, Nizam College, Osmania University, Hyderabad, Telangana, 500001, India
3
Department of Physics, Osmania University, Hyderabad, Telangana, 500007, India
dM dH
[6] observed saturation magnetization (MS ) of 2 emu· g−1 for grain size of 90 nm and as the grain size decreases, MS increases, exhibiting superparamagnetic behavior. To enhance the magnetic character, one of the ways is to introduce ferromagnetic material in a composite form [7, 8]. In general, the properties exhibited by composites result from the sum of volume fractions of individual phases [9, 10]. Among composites, manganites [11], hexaferrites [12, 13] and BaTiO3 [14] are often blended with specific mixtures of CoFe2 O4 [15], NiFe2 O4 [16], ZnFe2 O4 [17] and properties are mostly evaluated using saturation magnetization with varying weight percentages. Several hard/soft composites comprising dif
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