DocumentCode :
768500
Title :
Studies of polycrystalline cobalt-substituted lithium ferrites
Author :
Song, J.M. ; Koh, J.G.
Author_Institution :
Dept. of Phys., Soong Sil Univ., Seoul, South Korea
Volume :
32
Issue :
2
fYear :
1996
fDate :
3/1/1996 12:00:00 AM
Firstpage :
411
Lastpage :
415
Abstract :
The lattice constant, density, electrical conductivity, activation energy, carrier concentration, mobility, Seebeck coefficient, and ferromagnetic resonance linewidth were studied on a series of cobalt-substituted lithium ferrites. We have found that all the samples studied have single phase spinel structure. The lattice constant and the density are increased with substituting Co2+ contents. All the specimens studied have two regions of different activation energies. In the region below Ta (below 220°C), the conduction is attributed to electron hopping from Fe2+ to Fe3+; and in the region above Ta (above 220°C), it is attributed to ionic diffusion of Li ion. The change of mobility is caused by the dispersion of ions. The ferromagnetic resonance (F.M.R.) experimental results indicated that cobalt substitution affects linewidths and relaxation frequency, but it does not affect the g-factor
Keywords :
Seebeck effect; carrier density; carrier mobility; cobalt compounds; density; electrical conductivity; ferrites; ferromagnetic resonance; g-factor; lattice constants; lithium compounds; LiCoFe2O4; Seebeck coefficient; activation energy; carrier concentration; carrier mobility; density; electrical conductivity; electron hopping; ferromagnetic resonance linewidth; g-factor; ion dispersion; ionic diffusion; lattice constant; polycrystalline cobalt-substituted lithium ferrites; relaxation frequency; spinel structure; Coercive force; Conductivity; Ferrites; Lattices; Lithium; Magnetic properties; Microwave devices; Resonance; Steel; Temperature;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.486525
Filename :
486525
Link To Document :
بازگشت