Anantharaman, M R; Sindhu, S; Bindu, Thampi R; Malini, K A; Philip, Kurian(Springer, April 19, 2002)
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Abstract:
The effect of frequency, composition and temperature on the a.c. electrical conductivity were
studied for the ceramic, Ni1–xZnxFe2O4, as well as the filler (Ni1–xZnxFe2O4) incorporated rubber ferrite
composites (RFCs). Ni1–xZnxFe2O4 (where x varies from 0 to 1 in steps of 0×2) were prepared by usual ceramic
techniques. They were then incorporated into a butyl rubber matrix according to a specific recipe. The a.c.
electrical conductivity (sa.c.) calculations were carried out by using the data available from dielectric
measurements and by employing a simple relationship. The a.c. conductivity values were found to be of the
order of 10–3 S/m. Analysis of the results shows that sa.c. increases with increase of frequency and the change is
same for both ceramic Ni1–xZnxFe2O4 and RFCs. sa.c. increases initially with the increase of zinc content and
then decreases with increase of zinc. Same behaviour is observed for RFCs too. The dependence of sa.c. on the
volume fraction of the magnetic filler was also studied and it was found that the a.c. conductivity of RFCs
increases with increase of volume fraction of the magnetic filler. Temperature dependence of conductivity was
studied for both ceramic and rubber ferrite composites. Conductivity shows a linear dependence with
temperature in the case of ceramic samples
Description:
Bull. Mater. Sci., Vol. 25, No. 7, December 2002, pp. 599–607