Improvement In Ferromagnetism Of NiFe2O4 nanoparticles With Zn Doping

¹Department of Chemistry, Eternal University, Baru Sahib, (H.P.) 173101 India

²National Physical Laboratory, New Delhi, 110012 India 3Department of Physics, Eternal University, Baru Sahib, (H.P.) 173101 India

Adv. Mater. Lett., 2012, 'ICNANO 2011', 3 (6), pp 504-506

DOI: 10.5185/amlett.2012.icnano.226

Publication Date (Web): Sep 23, 2012

Copyright © IAAM-VBRI Press

Email: deepsukh.singh@gmail.com

Abstract

Structural, microstructural, infrared analysis and magnetic properties of Ni1-x ZnxFe₂O₄ (NZ) [x = 0.30 (NZ30), 0.35 (NZ35) and 0.40 (NZ40)] nanoferrites have been thoroughly studied. These NZ nanoferrites were synthesized by chemical combustion route and annealed at 500^oC for 5h. Fourier transform infrared (FTIR) spectra of these samples were used to identify formation of Ni-Zn spinel ferrites. These FTIR results show two characteristic absorption bands corresponding to M-O intrinsic stretching vibrations at the tetrahedral site and octahedral-metal stretching around 570-550 cm^-1 and 450-435 cm^-1, respectively. The X-ray diffraction shows the polycrystalline with spinel phase of these ferrites. The value of lattice constant a(Å) = 8.370, 8.371 and 8.380 respectively, for NZ₃₀, NZ₃₅ and NZ₄₀ which are consistent with that reported for pure NiFe₂O₄. The average particles size is measured using Debye-Scherer’s relation which lies in the range of 25-65 nm. Transmission electron microscopy measured average grain size is 26, 41 and 66 nm, respectively for NZ₃₀, NZ₃₅ and NZ₄₀ samples. The magnetic measurement shows saturation magnetization (Ms) of 67.63, 74.97, 80.63 emu/g, remanent magnetization (Mr) 20.01, 25.30, 25.30 emu/g and coercive field (Hc) 154.12, 154.13, 154.11 O^e, respectively for NZ30, NZ₃₅ and NZ₄₀. Highest saturation magnetization with Zn doping has been observed in the case of NZ40.

Keywords

Nanoparticles, ferromagnetism, TEM.