Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals
American Journal of Physics and Applications
Volume 3, Issue 2, March 2015, Pages: 33-38
Received: Dec. 14, 2014;
Accepted: Jan. 29, 2015;
Published: Mar. 4, 2015
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Nahed Makram Eyssa, Physics Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt
Hanan Hassan Hantour, Physics Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt
Kamilia Sdeek Abdo, Physics Department, Faculty of Science, Girls Branch, Al-Azhar University, Cairo, Egypt
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.
Nahed Makram Eyssa,
Hanan Hassan Hantour,
Kamilia Sdeek Abdo,
Phase Formation and Crystallinity-Dependent Magnetic Parameters of Co1-xFe2+xO4 Nanoparticals, American Journal of Physics and Applications.
Vol. 3, No. 2,
2015, pp. 33-38.
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