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Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts

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Abstract

Spinel MnxCo1−x Fe2O4; x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles were synthesized by ureaassisted auto combustion method using nitrates of Co, Mn and Fe as the starting materials and urea as the fuel. X-ray diffraction (XRD) analysis showed that all composition was found to have a cubic spinel structure. The average crystallite size of the samples was estimated using the Debye-Scherrer formula and was found to be in the range of 22.62 and 36.45 nm. The lattice parameter increased from 8.432 to 8.457 Å with increasing the Mn2+ content, which was determined by Rietveld analysis. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy (HR-TEM) analyses were used to study the morphological variation, and the results showed a nanosized particle-like morphology. Energy-dispersive X-ray (EDX) results showed that the composition of the elements was relevant as expected from the synthesis. The bandgap energy of the pure CoFe2 O 4 was estimated to be 2.33 eV from UV-visible diffuse reflectance spectroscopy (DRS). With the increase of Mn2+ ion, the bandgap energy increased from 2.35 to 2.42 eV. The magnetic properties of the samples were investigated at room temperature by using a vibrating sample magnetometer (VSM). The magnetic hysteresis (M-H) loop confirmed the superparamagnetic nature of pure CoFe2 O 4 and a weak ferromagnetic behavior of Mn2+doped CoFe2 O 4 samples with specific saturation magnetization in the range of 55.16±24 and 66.92 ± 05 emu/g. All compositions of spinel Mn x Co1−x Fe2 O 4 samples were successfully tested as catalyst for the conversion of benzyl alcohol, which has resulted in 62.75 and 92.62 % conversion efficiency of CoFe2 O 4 and Mn0.5Co0.5Fe2 O 4, respectively.

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Acknowledgments

One of the authors, A. Manikandan is thankful to CSIR, New Delhi for the award of Senior Research Fellowship (CSIR-SRF).

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Authors and Affiliations

  1. PG and Research Department of Chemistry, Presidency College (Autonomous), Chennai, 60005, India

    A. Manikandan & S. Arul Antony

  2. Department of Physics, A.V.V.M Sri Pushpam College (Autonomous), Poondi, Tamil Nadu, 613503, India

    M. Durka

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  1. A. Manikandan
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  2. M. Durka
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  3. S. Arul Antony
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Correspondence to A. Manikandan or S. Arul Antony.

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Manikandan, A., Durka, M. & Antony, S.A. Role of Mn2+ Doping on Structural, Morphological, and Opto-Magnetic Properties of Spinel Mn x Co1−x Fe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) Nanocatalysts. J Supercond Nov Magn 28, 2047–2058 (2015). https://doi.org/10.1007/s10948-015-2987-8

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