Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1623169 | Journal of Alloys and Compounds | 2008 | 5 Pages |
Abstract
The transport properties of mixed Ni-Cu ferrite are measured as ac electrical conductivity and thermoelectric power with a function of temperature and frequency. The results obtained for these materials reveal a semiconductor-metallic-semiconductor behavior as Cu content increase. All studied compositions exhibit a transition with the conductivity versus temperature. This transition temperature is found to decrease with increasing Cu content. The dielectric parameter (Éâ²) and loss (tan δ) are measured for all the compositions Ni1âxCuxFe2O4 with x = 0.0, 0.2, 0.5, 0.8, and 1.0 as a function of temperature at frequency range 200-100 kHz. The conduction mechanism is discussed on the basis of the hopping model. The thermoelectric power Ï is positive at room temperature for most samples, and the values of Ï tend towards negative values, indicating n-type behavior at high temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Kh. Roumaih,