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Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals

Received: 14 December 2014     Accepted: 29 January 2015     Published: 4 March 2015
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Abstract

Nano crystalline cobalt ferrite CoFe2O4 powders were synthesized using the coprecipitation method. The effect of the calcination temperature and the Fe3+/Co2+ molar ratio on the phase formation, macro and microstructure and magnetic properties was studied systematically. The Fe3+/Co2+ was controlled to equal 2 and 2.75 while the annealing temperature (Ta) was adjusted to vary from 600 to 1000Co. the obtained powders were investigated using x-ray diffraction (XRD) analysis, Field emission scanning electron microscope (FESEM), Fourir transformation infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). For both the Fe3+/Co2+ ratios, the XRD results indicat the formation of well crystallized cubic spinel cobalt ferrite phase for the precursors annealed at 600Co up to 1000Co. However a second rhombohedral hematite phase whose content varies respectively from 3% and 15% was formed as the Fe3+/Co2+ varied from 2 to 2.75 at Ta=800 and 1000Co. The crystallite size (Dβ) as determined applying the win-fit program was found also to decrease from 54.5 to 48.6nm accompanied by an increase of the root mean square strain < eg>. Using Rditveld analysis no effect on the value of the lattice parameter (a) was detected. The FESEM micrographs reveal the formation of highly agglomerated particles for Fe3+/Co2+ =2.75 and Ta =1000Co. The FTIR analysis confirm the formation of the spinel structure phase for both Fe3+/Co2+ ratios at 1000Co, however the absorption bands shift to higher frequencies for Fe3+/Co2+ =2.75. Other bands at 1663 and 3472cm-1 ascribed to free or absorbed water molecules were also detected for this ratio. The Fe3+/Co2+ molar ratio was found to have a significant effect on the magnetic properties of the produced cobalt ferrite. The calculated magnetic parameters: the saturation magnetization (MS= 71.219emu/g), the coricivity (HC= 1443.8Oe) and the remanence ratio (Mr/MS= 0.405) were recorded to decrease as the Fe3+/Co2+ increases except for the curie temperature (TC) which increase from 405 to 410Co.

Published in American Journal of Physics and Applications (Volume 3, Issue 2)
DOI 10.11648/j.ajpa.20150302.14
Page(s) 33-38
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2015. Published by Science Publishing Group

Keywords

Co Ferrite, Synthesized Using the Coprecipitation Method, Structure & Microstructure, Confirm the Formation of the Functional Groups of the Ferrite Structure and Magnetic Properties

References
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    Nahed Makram Eyssa, Hanan Hassan Hantour, Kamilia Sdeek Abdo. (2015). Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals. American Journal of Physics and Applications, 3(2), 33-38. https://doi.org/10.11648/j.ajpa.20150302.14

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    ACS Style

    Nahed Makram Eyssa; Hanan Hassan Hantour; Kamilia Sdeek Abdo. Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals. Am. J. Phys. Appl. 2015, 3(2), 33-38. doi: 10.11648/j.ajpa.20150302.14

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    AMA Style

    Nahed Makram Eyssa, Hanan Hassan Hantour, Kamilia Sdeek Abdo. Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals. Am J Phys Appl. 2015;3(2):33-38. doi: 10.11648/j.ajpa.20150302.14

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  • @article{10.11648/j.ajpa.20150302.14,
      author = {Nahed Makram Eyssa and Hanan Hassan Hantour and Kamilia Sdeek Abdo},
      title = {Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals},
      journal = {American Journal of Physics and Applications},
      volume = {3},
      number = {2},
      pages = {33-38},
      doi = {10.11648/j.ajpa.20150302.14},
      url = {https://doi.org/10.11648/j.ajpa.20150302.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajpa.20150302.14},
      abstract = {Nano crystalline cobalt ferrite CoFe2O4 powders were synthesized using the coprecipitation method. The effect of the calcination temperature and the Fe3+/Co2+ molar ratio on the phase formation, macro and microstructure and magnetic properties was studied systematically. The Fe3+/Co2+ was controlled to equal 2 and 2.75 while the annealing temperature (Ta) was adjusted to vary from 600 to 1000Co. the obtained powders were investigated using x-ray diffraction (XRD) analysis, Field emission scanning electron microscope (FESEM), Fourir transformation infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). For both the Fe3+/Co2+ ratios, the XRD results indicat the formation of well crystallized cubic spinel cobalt ferrite phase for the precursors annealed at 600Co up to 1000Co. However a second rhombohedral hematite phase whose content varies respectively from 3% and 15% was formed as the Fe3+/Co2+ varied from 2 to 2.75 at Ta=800 and 1000Co. The crystallite size (Dβ) as determined applying the win-fit program was found also to decrease from 54.5 to 48.6nm accompanied by an increase of the root mean square strain . Using Rditveld analysis no effect on the value of the lattice parameter (a) was detected. The FESEM micrographs reveal the formation of highly agglomerated particles for Fe3+/Co2+ =2.75 and Ta =1000Co. The FTIR analysis confirm the formation of the spinel structure phase for both Fe3+/Co2+ ratios at 1000Co, however the absorption bands shift to higher frequencies for Fe3+/Co2+ =2.75. Other bands at 1663 and 3472cm-1 ascribed to free or absorbed water molecules were also detected for this ratio. The Fe3+/Co2+ molar ratio was found to have a significant effect on the magnetic properties of the produced cobalt ferrite. The calculated magnetic parameters: the saturation magnetization (MS= 71.219emu/g), the coricivity (HC= 1443.8Oe) and the remanence ratio (Mr/MS= 0.405) were recorded to decrease as the Fe3+/Co2+ increases except for the curie temperature (TC) which increase from 405 to 410Co.},
     year = {2015}
    }
    

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  • TY  - JOUR
    T1  - Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals
    AU  - Nahed Makram Eyssa
    AU  - Hanan Hassan Hantour
    AU  - Kamilia Sdeek Abdo
    Y1  - 2015/03/04
    PY  - 2015
    N1  - https://doi.org/10.11648/j.ajpa.20150302.14
    DO  - 10.11648/j.ajpa.20150302.14
    T2  - American Journal of Physics and Applications
    JF  - American Journal of Physics and Applications
    JO  - American Journal of Physics and Applications
    SP  - 33
    EP  - 38
    PB  - Science Publishing Group
    SN  - 2330-4308
    UR  - https://doi.org/10.11648/j.ajpa.20150302.14
    AB  - Nano crystalline cobalt ferrite CoFe2O4 powders were synthesized using the coprecipitation method. The effect of the calcination temperature and the Fe3+/Co2+ molar ratio on the phase formation, macro and microstructure and magnetic properties was studied systematically. The Fe3+/Co2+ was controlled to equal 2 and 2.75 while the annealing temperature (Ta) was adjusted to vary from 600 to 1000Co. the obtained powders were investigated using x-ray diffraction (XRD) analysis, Field emission scanning electron microscope (FESEM), Fourir transformation infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). For both the Fe3+/Co2+ ratios, the XRD results indicat the formation of well crystallized cubic spinel cobalt ferrite phase for the precursors annealed at 600Co up to 1000Co. However a second rhombohedral hematite phase whose content varies respectively from 3% and 15% was formed as the Fe3+/Co2+ varied from 2 to 2.75 at Ta=800 and 1000Co. The crystallite size (Dβ) as determined applying the win-fit program was found also to decrease from 54.5 to 48.6nm accompanied by an increase of the root mean square strain . Using Rditveld analysis no effect on the value of the lattice parameter (a) was detected. The FESEM micrographs reveal the formation of highly agglomerated particles for Fe3+/Co2+ =2.75 and Ta =1000Co. The FTIR analysis confirm the formation of the spinel structure phase for both Fe3+/Co2+ ratios at 1000Co, however the absorption bands shift to higher frequencies for Fe3+/Co2+ =2.75. Other bands at 1663 and 3472cm-1 ascribed to free or absorbed water molecules were also detected for this ratio. The Fe3+/Co2+ molar ratio was found to have a significant effect on the magnetic properties of the produced cobalt ferrite. The calculated magnetic parameters: the saturation magnetization (MS= 71.219emu/g), the coricivity (HC= 1443.8Oe) and the remanence ratio (Mr/MS= 0.405) were recorded to decrease as the Fe3+/Co2+ increases except for the curie temperature (TC) which increase from 405 to 410Co.
    VL  - 3
    IS  - 2
    ER  - 

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Author Information
  • Physics Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt

  • Physics Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt

  • Physics Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt

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