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Title: Mössbauer spectroscopy, magnetic characteristics, and reflection loss analysis of nickel-strontium substituted cobalt ferrite nanoparticles

In current research work, Co{sub 1-x}Ni{sub x/2}Sr{sub x/2}Fe{sub 2}O{sub 4} (x = 0–1 in a step of 0.2) ferrite nanoparticles were synthesized by a sol-gel method. According to the evolution in the subspectral areas obtained from Mössbauer spectroscopy, it was found that the relaxing iron belongs mostly to the site B, since the Mössbauer fraction of site A does not vary appreciably. With an increase in Ni-Sr substitution contents in cobalt ferrite, the coercivity and saturation of magnetization decrease. Variation of reflection loss versus frequency in microwave X-band demonstrates that the reflection peak shifts to lower frequency by adding substituted cations and the synthesized nanoparticles can be considered for application in electromagnetic wave absorber technology.
Authors:
 [1] ; ;  [2] ;  [3] ;  [4] ; ;  [5]
  1. Materials Engineering Department, Malek Ashtar University of Technology, Shahin Shahr (Iran, Islamic Republic of)
  2. Departamento de Física, Centro de Ciências Exatas, Universidade Estadual de Maringá, Maringá (Brazil)
  3. Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad (India)
  4. (Japan)
  5. Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano (Japan)
Publication Date:
OSTI Identifier:
22273775
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; CATIONS; COBALT COMPOUNDS; COERCIVE FORCE; CONCENTRATION RATIO; FERRITES; MAGNETIZATION; MICROWAVE RADIATION; NANOSTRUCTURES; NICKEL COMPOUNDS; PARTICLES; REFLECTION; SOL-GEL PROCESS