Solid State Science and Technology, Vol. 12, No. 1 (2004) 53-58
THE EFFECT OF VACANCIES ON SOME MAGNETIC PROPERTIES OF IRON - DEFICIT (NiO)x(ZnO)y(Fe2O3)z SYSTEM
*Noorhana Yahya, *M. Hashim , R.S. Azis ,
**Zolman Hari, N.M. Saiden, R. Alias andA. Magen
*Institute of Advance Technology (IAT),
Faculty of Science and Environmental Studies,
Universiti Putra Malaysia,
43400 UPM, Serdang, Selangor.
**Department of Engineering Science and Mathematics,
Universiti Tenaga Nasional (UNITEN),
Km7, Jalan Kajang-Puchong,
The effect of iron deficiency of Ni0.30+2XZn0.70Fe2-2XO4-4X with X = 0.00, 0.01, 0.02,
0.03 and 0.04 were carefully studied. High purity (99.992%) starting oxides were used and toroidal samples were prepared by using a conventional oxide-mixing technique. X-Ray Diffraction analysis of the iron deficit samples identified single phase ferrite. Grain size of 31.8µm and lowest theoretical porosity, 0.78%, for sample with 0.47 mole fraction of iron oxide was obtained. It is speculated that cationic and anionic vacancies are sufficiently formed for the diffusive transportation of metal ions to occur for the sample. However, sample with 0.46 mole fraction of iron oxide gave the highest saturation induction, 2757 Gauss as well as highest Curie temperature (5000C) due to stronger superexchange interaction.
 Okomoto, A. (1984) “ Effect of Surface Free Energy On The Microstructure Of The
Sintered Ferrite,” Ceramic Bulletin, Vol. (64) : 888 – 890.
 Tebble, R.S. and D.J. Craik (1976) Magnetic Materials . Wiley – Interscience.
 Goldman, A. (1991) Modern Ferrite Technology. Van Nostrand Reinhold, New York.
 Pyun, S.I. and J.T. Baek (1985) “Microstructure Dependence of Permeability and
Permeability Spectra in Ni-Zn Ferrites,” Ceramic Bulletin, Vol. 64(4) : 602 – 605.
 Wolfarth, E.P (1980) “Ferromagnetic Materials,” Vol. 2, North Holland Publishing