ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The magnetic properties of Ni-Zn ferrites have been upgraded by preparing hot-pressed Ni0.4Zn0.6−2xLixFe2+xO4 ferrites wherein 2xZn2+ ions have been substituted byxLi1+ andxFe3+ ions. This results in an increase of saturation magnetization, Curie temperature and dielectric constant, whereas resistivity and initial permeability are reduced. The values of saturation magnetization, Curie temperature and dielectric constant are improved due to hot pressing in which grain growth and densification are controlled simultaneously. The variations of saturation magnetization and Curie temperature can be explained by the preferential site occupancy of Li1+ and Ni2+ ions at the tetrahedral site, sublattice magnetization with canted spin structure, and magnetic exchange interactions. The inferences drawn from the bulk magnetic properties of these ferrites conform with the conclusions drawn from variations of internal magnetic field, obtained from Mössbauer studies of these samples. The decrease in d.c. resistivity due to substitution of Li1+ ions is attributed to increased hopping due to formation of Fe2+ and Ni3+ ions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01142037
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