Magneto-optical properties of Cu1-xZnxFe2O4 nanoparticles


Guner S. , Esir S., Baykal A., Demir A., Bakis Y.

SUPERLATTICES AND MICROSTRUCTURES, vol.74, pp.184-197, 2014 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 74
  • Publication Date: 2014
  • Doi Number: 10.1016/j.spmi.2014.06.021
  • Title of Journal : SUPERLATTICES AND MICROSTRUCTURES
  • Page Numbers: pp.184-197
  • Keywords: Optical properties, Spinal ferrites, Magnetic properties, Nanoparticles, BAND-GAP DETERMINATION, MAGNETIC-PROPERTIES, CATION DISTRIBUTION, OPTOELECTRONIC PROPERTIES, FACILE SYNTHESIS, AUTO-COMBUSTION, ZN, NANOCRYSTALS, ZNFE2O4, MICROSTRUCTURE

Abstract

Zn doped CuFe2O4 nanoparticles (CZF NPs) were synthesized by a citric acid assisted sol–gel auto combustion process. The obtained samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), high resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray analysis, UV–Vis diffuse reflectance spectra (DRS), and vibrating sample magnetometer (VSM). XRD results confirmed the formation of cubic spinel-type structure with an average crystallite size in the range of 27–33 nm. The variation lattice constants obey the Vegard’s Law. The CZF NPs were evaluated for their magneto-optical characteristics. The CZF NPs exhibit superparamagnetic behavior at room temperature (RT). The average Ms value for CZF NPs is about 57 emu/g. The observed magnetic moments of products are in the range of 1.76–2.49 μB. The small Mr/Ms ratios (maximum 0.22) specify uniaxial anisotropy in the Cu1−xZnxFe2O4 NPs. The high Ms and magnetic moment values are attributed to cation distribution change. The direct optical band gap (Eg) value of CZF NPs was found as 1.42 eV.

Zn doped CuFe2O4 nanoparticles (CZF NPs) were synthesized by a citric acid assisted sol-gel auto combustion process. The obtained samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), high resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray analysis, UV-Vis diffuse reflectance spectra (DRS), and vibrating sample magnetometer (VSM). XRD results confirmed the formation of cubic spinel-type structure with an average crystallite size in the range of 27-33 nm. The variation lattice constants obey the Vegard's Law. The CZF NPs were evaluated for their magneto-optical characteristics. The CZF NPs exhibit superparamagnetic behavior at room temperature (RT). The average M-s value for CZF NPs is about 57 emu/g. The observed magnetic moments of products are in the range of 1.76-2.49 mu(B). The small M-r/M-s ratios (maximum 0.22) specify uniaxial anisotropy in the Cu(1-x)Zn(x)cFe(2)O(4) NPs. The high M-s and magnetic moment values are attributed to cation distribution change. The direct optical band gap (E-g) value of CZF NPs was found as 1.42 eV. (C) 2014 Elsevier Ltd. All rights reserved.