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Title: Effect of Co{sub 2+} substitution in Mg{sub 0.5}Zn{sub 0.5−x}Co{sub x}Fe{sub 2}O{sub 4} ferrite nanoparticles: Study of structural, dielectric and magnetic properties

Polycrystalline samples of Mg{sub 0.5}Zn{sub 0.5−x}Co{sub x}Fe{sub 2}O{sub 4} (0 ≤ x ≤ 0.5) with x varying from 0.0-0.5 synthesized by sol-gel auto ignition method. The X-ray diffraction analysis with Retvield refinement reveals the formation of single phase cubic spinel structure. The frequency dependent of real part of dielectric constant has been measured at room temperature and at 100 °C by using an ac impedance analyzer. Except x = 0.5, an increase in the dielectric constant is observed with increase in Co{sup 2+} substitution. Magnetic response has been seen by vibrating sample magnetometer (VSM) at room temperature. The saturation magnetization (M{sub S}) and coercivity (H{sub C}) increase with increasing the Co{sub 2+} substitution. The cation distribution estimated by Mössbauer spectroscopy shows that Co{sub 2+} and Mg{sub 2+} ions have their preference towards octahedral B site, on the other hand Zn{sub 2+} ions preferentially occupy tetrahedral A site, whereas Fe{sub 3+} ions are randomly distributed over A- and B-site. The as obtained results indicated that the substitution of Co{sub 2+} has brought the significant changes in the structural, electrical and magnetic properties of as prepared Mg-Zn-Co multioxide nanocrystals.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Dept. of Applied Physics, Aligarh Muslim University, Aligarh- 202002 (India)
  2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400085 (India)
  3. Dept. of Physics, Nizam College, Osmania University, Hyderabad-500001 (India)
  4. Centre for Material Science and Engineering, N.I.T. Hamirpur-177005, H.P (India)
  5. Dept. of Physics, Pohang University of Science and Technology, Pohang- 790784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22269355
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON DIOXIDE; COBALT IONS; COERCIVE FORCE; DIELECTRIC MATERIALS; FERRITE; FERRITES; FREQUENCY DEPENDENCE; MAGNETIC PROPERTIES; MAGNETIZATION; NANOSTRUCTURES; PARTICLES; PERMITTIVITY; POLYCRYSTALS; SOL-GEL PROCESS; SPECTROSCOPY; SPINELS; VIBRATING SAMPLE MAGNETOMETERS; X-RAY DIFFRACTION