Sol-Gel Synthesis, Structure and Optical Properties of Nickel-Manganese Ferrites

Authors V.S. Bushkova1 , I.P. Yaremiy1 , B.K. Ostafiychuk1 , 2 , N.I. Riznychuk1, R.S. Solovei1

1 Vasyl Stefanyk Precarpathian National University, 57 Shevchenko St., 76025 Ivano-Frankivsk, Ukraine

2 Institute of Metal Physics, National Academy of Science, 36 Aсad. Vernadsky Boulevard, 03680 Kyiv, Ukraine

Issue Volume 11, Year 2019, Number 3
Dates Received 25 October 2018; revised manuscript received 12 June 2019; published online 25 June 2019
Citation V.S. Bushkova, I.P. Yaremiy, B.K. Ostafiychuk, et al. J. Nano- Electron. Phys. 11 No 3, 03021 (2019)
PACS Number(s) 82.45.Yz, 82.47.Uv, 71.20.Tx
Keywords Ferrite (18) , Nanopowder (4) , Sol-gel auto-combustion, Band gap energy.

The nickel ferrite NiFe2O4 obtained by ceramic technology has been widely studied due to its tremendous properties like high electromagnetic performance, excellent chemical stability and mechanical hard-ness, and moderate saturation magnetization, making it a good contender for the application as soft magnets and low loss materials at high frequencies. The structure, mechanical, magnetic, electrical and dielectric properties of nickel ferrite are dependent upon several factors including the method of preparation, sintering time and temperature, chemical composition, type and amount of dopant, grain structure. The sol-gel with participation of auto-combustion (SGA) technique was used for the synthesis of Ni1-xMnxFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) nanoparticle ferrites. The mixed solution was dried at a temperature around 403 K. During evaporation the solution became viscous and finally formed a xerogel. At further temperature rise, the organic constituents are decomposed with the generation of gases such as CO2, N2 and H2O; therefore the xerogel automatically ignited. The auto-combustion was completed within a few seconds, yielding the nanopowders of ferrites. Structural parameters, morphology and optical properties were investigated. The XRD results confirm single-phase formation of the as-prepared samples with 0.0 ≤ x ≤ 0.4 having the Fd3m space group. The Ni0.5Mn0.5Fe2O4 and Ni0.4Mn0.6Fe2O4 powders except the spinel phase contain also additional FeO and Ni phases. The crystallite sizes (27-43 nm) decrease and the lattice parameters (0.8343-0.8459 nm) increase, while the Mn concentration increases. Morphological observations reveal that the crystallinity decreases significantly with increasing Mn content meanwhile the particle size becomes more uniform. It was found that the optical band gap increases with increasing concentration of Mn2+ ions in the ferrite structure. The band gap is in the range from 2.00 eV to 3.26 eV.

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