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Title: Size dependent structural and magnetic properties of Al substituted Co–Mg ferrites synthesized by the sol–gel auto-combustion method

Highlights: • Well-crystalline Co{sub 0.7}Mg{sub 0.3}AlFeO{sub 4} nanoparticles with small grain size were obtained. • The approach is sol–gel auto-combustion technique for obtained nanoparticles. • The prepared Co{sub 0.7}Mg{sub 0.3}AlFeO{sub 4} ferrites are decent soft materials with low coercivity. • The minor decrease in lattice parameter with increase of temperature was observed. - Abstract: Single phased nanocrystalline Co{sub 0.7}Mg{sub 0.3}FeAlO{sub 4} ferrites having low coercivity were synthesized by the sol–gel auto-combustion route. The subsequent powder materials were sintered in a temperature range of 800–1200 °C for 2 h. The effects of sintering temperatures on the structure, morphology and magnetic properties of the prepared soft magnetic material were studied. X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and magnetic property measurement system (MPMS) were used to characterize the samples. X-ray diffraction analysis confirmed a single-phase cubic spinel structure and ruled out the presence of impurities like hematite. The higher sintering temperatures have caused in enhanced mark of crystallinity and bigger average grain size of the nanocrystals. A slight decrease in lattice parameters was noticed with a rise of grain size. Magnetic measurements revealed that grain size increase led to a decrease in the coercivity and, in difference, anmore » increase in the saturation magnetization.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Department of Physics, Bahauddin Zakariya University, Multan 60800 (Pakistan)
  2. Centre for Solid State Physics, University of the Punjab, Lahore 54560 (Pakistan)
  3. Department of Physics, Comsats Institute of Information Technology, Islamabad 44000 (Pakistan)
  4. Centre for Emerging Sciences, Engineering and Technology (CESET) , I 10/3, Islamabad 45320 (Pakistan)
Publication Date:
OSTI Identifier:
22345254
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 52; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COERCIVE FORCE; CRYSTALS; FERRITE; FERRITES; GRAIN SIZE; HEMATITE; LATTICE PARAMETERS; MAGNETIC PROPERTIES; MAGNETIZATION; NANOPARTICLES; NANOSTRUCTURES; SCANNING ELECTRON MICROSCOPY; SOL-GEL PROCESS; SPINELS; SYNTHESIS; TEMPERATURE RANGE; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY DIFFRACTOMETERS