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Title: Magnetic studies of magnesium ferrite nanoparticles prepared by sol-gel technique

Mg-ferrite nanoparticles were prepared by sol-gel technique and were annealed at different temperatures in air for 4 hours. Structural studies by X-ray diffraction confirmed the Mg-ferrite phasein all the samples annealed up to 600°C. Traces of α-Fe{sub 2}O{sub 3} were found for the sample annealed at higher temperature of 750°C.Grain size was found to be increasedfrom 13nm to 37nm with the increase in the annealing temperature. These samples showed super-paramagentic behavior at 300K where as at 60K they showed ferrimagnetic behavior.For the as prepared sample the magnetization value of 21emu/g was observed at 300K. The highest magnetization value of 24 emu/g which is ∼ 90% of the bulk value of Mg-ferrite, was observed at 300K for the sample annealed at 750°C.The observed magnetic behavior of these nanoparticles may be understood on the basis of nanosize grains, increase inrandom anisotropy and reduced thermal effects at low temperature.
Authors:
; ; ;  [1] ;  [2]
  1. Dept. of Physics, Central University of Kerala, Riverside Transit Campus, Kasaragod, Kerala - 671314 (India)
  2. Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai – 400076 (India)
Publication Date:
OSTI Identifier:
22490277
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 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; ANISOTROPY; ANNEALING; FERRIMAGNETISM; FERRITES; GRAIN SIZE; IRON OXIDES; MAGNESIUM COMPOUNDS; MAGNETIZATION; NANOPARTICLES; NANOSTRUCTURES; SOL-GEL PROCESS; SUPERPARAMAGNETISM; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION