Effects of non-stoichiometry on magnetic properties and microstructure of Ni0.3 Zn0.7 Fe2 xO4 and Mg0.5 Zn0.5 Fe2 xO4

Rosidah Alias, . Effects of non-stoichiometry on magnetic properties and microstructure of Ni0.3 Zn0.7 Fe2 xO4 and Mg0.5 Zn0.5 Fe2 xO4. 40-. ISSN 0128-6072

Various non-stoichiometric compositions of Ni-Zn ferrites and Mg-Zn ferrites were investigated. The samples were prepared by the conventional sintering method while being subjected to an air atmospheric condition. The measurement of magnetic properties such as magnetic permeability magnetic loss Curie temperature magnetic flux density and microstructure were performed to understand the magnetic properties of samples prepared by systematic compositional changes. X-ray diffraction results indicate that the samples are good in crystalline form. Curie temperature variation can be explained on the basis of Neels two sub-lattices model and could be due to distribuition of magnetic icons between two sub-lattices.The dependence of magnetic permeability with temperature shows that the trends exhibited by all the samples are similar.With increase in temperature permeability increase gradually and then shows sudden drop at the Curie point because the anisotropy constant decreases more rapidly than the saturation magnetization. The dependence of permeability on iron oxide content obeys Globus model. The change of permeability in the cation-deficient region is caused by the positive contribution of the anisotropy constant to the total anisotropy during conversation of Fe3 ions to Fe2 ions. However for the anion-deficient region the variation in permeability is mainly accounted to be due to microstructural changes. The loss factor and the quality factor were also calculated and this study has revealed that the iron oxide concentration is a determining factor for high quality ferrites. Finally this study shows that high permeability values of Zn and Mg-Zn ferrites occur in the cation-deficient region with x0.002-0.006 weight percent.

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Abstract

Various non-stoichiometric compositions of Ni-Zn ferrites and Mg-Zn ferrites were investigated. The samples were prepared by the conventional sintering method while being subjected to an air atmospheric condition. The measurement of magnetic properties such as magnetic permeability magnetic loss Curie temperature magnetic flux density and microstructure were performed to understand the magnetic properties of samples prepared by systematic compositional changes. X-ray diffraction results indicate that the samples are good in crystalline form. Curie temperature variation can be explained on the basis of Neels two sub-lattices model and could be due to distribuition of magnetic icons between two sub-lattices.The dependence of magnetic permeability with temperature shows that the trends exhibited by all the samples are similar.With increase in temperature permeability increase gradually and then shows sudden drop at the Curie point because the anisotropy constant decreases more rapidly than the saturation magnetization. The dependence of permeability on iron oxide content obeys Globus model. The change of permeability in the cation-deficient region is caused by the positive contribution of the anisotropy constant to the total anisotropy during conversation of Fe3 ions to Fe2 ions. However for the anion-deficient region the variation in permeability is mainly accounted to be due to microstructural changes. The loss factor and the quality factor were also calculated and this study has revealed that the iron oxide concentration is a determining factor for high quality ferrites. Finally this study shows that high permeability values of Zn and Mg-Zn ferrites occur in the cation-deficient region with x0.002-0.006 weight percent.

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Item Type:	Article
AGROVOC Term:	METALLIC ELEMENTS
AGROVOC Term:	PERMEABILITY
AGROVOC Term:	MAGNETIC PROPERTIES
AGROVOC Term:	ULTRASTRUCTURE
AGROVOC Term:	TEMPERATURE
AGROVOC Term:	MALAYSIA ELEMENTOS METALICOS
AGROVOC Term:	PERMEABILIDAD
AGROVOC Term:	PROPIEDADES MAGNETICAS
AGROVOC Term:	ULTRAESTRUCTURA
AGROVOC Term:	TEMPERATURA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:26
URI:	http://webagris.upm.edu.my/id/eprint/21169

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