Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1622765 | Journal of Alloys and Compounds | 2009 | 7 Pages |
Abstract
Nickel-doped iron-deficient cobalt ferrite with small amount of manganese having the chemical composition Co1âxNixFe1.9Mn0.1O4, with x = 0.2, 0.4, 0.6 and 0.8, were prepared by standard double sintering ceramic method. The spinel phase formation was confirmed by X-ray diffraction (XRD). The DC resistivity measurements with temperature indicate a semiconducting behavior showing a linear decrease with increasing temperature and the doping of Ni enhances the resistivity. Maximum resistivity of the order of 109 Ω cm was found for composition x = 0.8. Room temperature dielectric constant measurements with frequency (100 Hz to 1 MHz), show usual dielectric dispersion. Also, the variation of room temperature AC conductivity as a function of frequency were studied and explained by using Maxwell-Wagner two-layer model. The studies on dielectric constant (Éâ²), loss tangent (tan δ) and AC conductivity (ÏAC), at four different frequencies (viz., 1, 10, 100 kHz and 1 MHz), with temperature were made.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
P.A. Shaikh, R.C. Kambale, A.V. Rao, Y.D. Kolekar,