N. Okasha
Ain Shams University
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Publication
Featured researches published by N. Okasha.
Journal of Magnetism and Magnetic Materials | 2003
M.A. Ahmed; N. Okasha; L.M. Salah
Abstract The ferrites having the general formula Ni1−xZnxFe2O4 with 0⩽x⩽0.5 and Ni0.5Zn0.5YyFe2−yO4 with 0.02⩽x⩽0.10 were synthesized under atmospheric pressure, and showed single spinel phase in X-ray diffractogram patterns. The structural properties and the magnetic behavior at different magnetic fields and concentration of the substituted nonmagnetic (Zn2+) and yttrium (Y3+) ions were studied. The magnetic constants have been calculated from DC magnetic susceptibility measurements. The transition from ferrimagnetic to the paramagnetic state is accompanied by an increase in the thermo-emf. It was observed that the magnetic moment of the system and the Curie temperature decreased by substitution of Zn. This means that some cations on the B site migrate to the A site which control the physical properties of the system.
Nanotechnology | 2008
M.A. Ahmed; N. Okasha; S.I. El-dek
Journal of Magnetism and Magnetic Materials | 2007
M.A. Ahmed; N. Okasha; M. Oaf; R.M. Kershi
Journal of Magnetism and Magnetic Materials | 2008
M.A. Ahmed; N. Okasha; R.M. Kershi
Journal of Alloys and Compounds | 2010
N. Okasha
Physica B-condensed Matter | 2010
M.A. Ahmed; N. Okasha; R.M. Kershi
Journal of Alloys and Compounds | 2010
M.A. Ahmed; N. Okasha; S.F. Mansour; S.I. El-dek
Solid State Sciences | 2011
M.A. Ahmed; S.I. El-dek; S.F. Mansour; N. Okasha
Ceramics International | 2010
M.A. Ahmed; N. Okasha; S.I. El-dek
Materials Chemistry and Physics | 2004
M.A. Ahmed; N. Okasha; Mohamed. A. Gabal
