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Superparamgnetic Fe3O4 and RE:Fe3O4 (RE = Dy, Nd, La) nanoparticles with an average crystallite size in the range of 15–24 nm, were synthesized by co-precipitation method. The samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), UV–Vis spectroscopy, LCR bridge, and two-probe technique. X-ray diffraction patterns of all the investigated samples reveal the typical phase of magnetite structure, with a small contribution of orthoferrite (NdFeO3) as a secondary phase in Nd:Fe3O4 sample. The saturation magnetization ( Ms) of the samples has values in the range from 41.8 to 52.3 emu/g, and decreases with RE ion doping depending on the ionic radius. Negligible values of the coercivity Hc and remanence Mr, indicate the superparamagnetic nature of the investigated samples. The calculated values of indirect optical band gap of Fe3O4 and RE:Fe3O4 nanoparticles are in the range of 0.9–1.25 eV. The dielectric constant of the samples decreases, while their activation energy increases with the increasing of ionic radii of dopants.


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Influence of rare earth ion substitutions on the structural, optical, transport, dielectric, and magnetic properties of superparamagnetic iron oxide nanoparticles

Show Author's information R. M. KERSHIa,b( )F. M. ALIa,cM. A. SAYEDa,d
Physics Department, Faculty of Science, King Khalid University, P. O. Box 9004, Abha 61413, Saudi Arabia
Physics Department, Faculty of Science, Ibb University, Yemen
Physics Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
Physics Department, Faculty of Science, Al-Azhar University, Assiut 71524, Egypt

Abstract

Superparamgnetic Fe3O4 and RE:Fe3O4 (RE = Dy, Nd, La) nanoparticles with an average crystallite size in the range of 15–24 nm, were synthesized by co-precipitation method. The samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), UV–Vis spectroscopy, LCR bridge, and two-probe technique. X-ray diffraction patterns of all the investigated samples reveal the typical phase of magnetite structure, with a small contribution of orthoferrite (NdFeO3) as a secondary phase in Nd:Fe3O4 sample. The saturation magnetization ( Ms) of the samples has values in the range from 41.8 to 52.3 emu/g, and decreases with RE ion doping depending on the ionic radius. Negligible values of the coercivity Hc and remanence Mr, indicate the superparamagnetic nature of the investigated samples. The calculated values of indirect optical band gap of Fe3O4 and RE:Fe3O4 nanoparticles are in the range of 0.9–1.25 eV. The dielectric constant of the samples decreases, while their activation energy increases with the increasing of ionic radii of dopants.

Keywords:

superparamgnetic iron oxide nanoparticles (SPIONs), rare earth (RE) ions, structure, optical and activation energies, electrical conductivity, dielectric constant, saturation magnetization
Received: 14 January 2018 Revised: 26 March 2018 Accepted: 28 March 2018 Published: 10 October 2018 Issue date: September 2018
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Publication history

Received: 14 January 2018
Revised: 26 March 2018
Accepted: 28 March 2018
Published: 10 October 2018
Issue date: September 2018

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