Al-Doped Co-Cd Nanoferrites by Solution-Combustion Synthesis: Preparation and Structural Characterization
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l-Doped Co-Cd Nanoferrites by Solution-Combustion Synthesis: Preparation and Structural Characterization L. C. Shidaganala, d, A. B. Kulkarnib, S. B. Kapatkarc, *, S. N. Mathadd, **, and R. B. Pujara aDepartment
of Physics, P.C. Jabin Science College, Hubballi, Karnataka, India of Physics, SKES Govindram Seksaria Science College, Belagavi, India c K.L.E. Technological University, Hubballi, Karnataka, India dDepartment of Engineering Physics, K.L.E. Institute of Technology, Hubballi, Karnataka, India *e-mail: [email protected] **e-mail: [email protected] bDepartment
Received May 4, 2020; revised May 16, 2020; accepted May 17, 2020
Abstract—Al-doped Co-Cd ferrites Co0.4Cd0.6 AlxFe2–xO4 (x = 0.1, 0.2, 0.3, 0.4) were prepared by solutioncombustion synthesis (SCS) and characterized by XRD, SEM, EDAX, and FTIR. A simple cubic spinel structure of synthesized ferrites with a = 8.496–8.545 Å was confirmed by XRD. The uniform size distribution of ferrite grains was observed in SEM micrographs. The elemental analysis confirmed the presence of all metal ions from the ferrite formula. FTIR spectra showed two absorption bands, υ1 (568–580 cm–1) and υ2 (413–451cm–1), attributed to Me–O vibration modes at tetrahedral and octahedral sites, respectively. Our results may turn interesting to those engaged in combustion synthesis of ferrites. Keywords: solution-combustion synthesis, Al-doped Co–Cd ferrites, structural characteristics DOI: 10.3103/S1061386220030103
1. INTRODUCTION Cubic spinel ferrites AB2O4 [1] find wide practical applications [2]. Cobalt ferrite CoFe2O4 attracts much attention owing to its excellent properties such as relatively high saturation magnetization (Ms), high coercivity (Hc), magnetic anisotropy, chemical stability, and catalytic activity, some of which can also be tuned [3]. Spinel ferrites are good candidates for use in magnetic recording and microwave applications [4], permanent magnets [5], magnetic drug delivery [6], highdensity information storage [7], in recording heads, antenna rods, loading coils, microwave devices, and core material for power transformers [8]. Ferrite materials can be prepared by a number of methods such as co-precipitation [9], solid-state reactions [10, 11], citrate gel process [12], solution combustion [13], ball milling [14], and hydrothermal synthesis [15]. In this communication, we report on the influence of Al doping on structural and mechanical properties of crystalline Co–Cd spinel ferrites prepared by solution-combustion synthesis (SCS).
2. EXPERIMENTAL AR grade starting materials—Co(NO3)2 ⋅ 6H2O, Cd(NO3)2 ⋅ 4H2O, Al(NO3)3 ⋅ 9H2O, and Fe(NO3)3 ⋅ 9H2O—were taken in stoichiometric amounts, dissolved in double distilled water, and stirred at 60°C to get uniform solution. A suitable amount of sucrose was added into the mixture. The mixture was then heated until ignition and resultant product was sintered at 800°C [16] for 10 h. The end product was then used to prepare pellets 1 cm in diameter under 10-ton pressure using PVA as binder. These pellets were sintered agai
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