DocumentCode :
1037317
Title :
Mechanism of electrical conductivity in Nickel-Iron Ferrite
Author :
Jefferson, Clinton F. ; Baker, C. Kenneth
Author_Institution :
National Bureau of Standards, Boulder, Colo
Volume :
4
Issue :
3
fYear :
1968
fDate :
9/1/1968 12:00:00 AM
Firstpage :
460
Lastpage :
464
Abstract :
Measurements of the frequency dependence of the dielectric conductivity, Hall mobility, and thermal EMF as a function of temperature on polycrystalline Ni0.6 Fe0.4 Fe2 O4 indicate that these data can be interpreted in terms of the band model. Previous analyses of the semiconductor properties of ferrites according to the hopping model assume that the number of carriers 
is identical with the concentration of divalent iron ions. Hall measurements indicate that this is not the case here, and that is best described by the equation ![n^{2} = (N_{D}-n)N_{0}[frac{m*}{m}]^{3/2} g^{-1} \\exp (frac{-E_{D}}{kT})](/images/tex/8485.gif)
. Assigning a value of 2 to 
is 9.3, and ED is 0.034 eV.
is identical with the concentration of divalent iron ions. Hall measurements indicate that this is not the case here, and that is best described by the equation . Assigning a value of 2 to is 9.3, and EKeywords :
Conductivity; Nickel-iron ferrites; Conductivity measurement; Dielectric measurements; Equations; Ferrites; Frequency dependence; Frequency measurement; Hall effect; Iron; Temperature dependence; Thermal conductivity;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1968.1066240
Filename :
1066240
Link To Document :
