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

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          Abstract

          Superparamgnetic Fe 3O 4 and RE:Fe 3O 4 (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 (NdFeO 3) as a secondary phase in Nd:Fe 3O 4 sample. The saturation magnetization ( M s ) 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 H c and remanence M r , indicate the superparamagnetic nature of the investigated samples. The calculated values of indirect optical band gap of Fe 3O 4 and RE:Fe 3O 4 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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          Author and article information

          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 September 2018
          : 07
          : 03
          : 218-228 (pp. )
          Affiliations
          aPhysics Department, Faculty of Science, King Khalid University, P. O. Box 9004, Abha 61413, Saudi Arabia
          bPhysics Department, Faculty of Science, Ibb University, Yemen
          cPhysics Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
          dPhysics Department, Faculty of Science, Al-Azhar University, Assiut 71524, Egypt
          Author notes
          * Corresponding author. E-mail: rkershi1@ 123456gmail.com
          Article
          2226-4108-07-03-218
          10.1007/s40145-018-0273-5

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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