Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Materials Chemistry and Physics
Year: 2009  |  Volume: 115  |  Issue: 1  |  Page No.: 334 - 338

Electrical conductivity and magnetic properties of Li0.5Fe2.5−xCrxO4 ferrite

Yen-Pei Fu    

Abstract: Cr-substituted lithium ferrite of different composition (Li0.5Fe2.5–xCrxO4) were prepared for x = 0.0–1.0 by conventional ceramic technique. A structure characterization of all the samples was carried out by the X-ray diffraction technique and found that the lattice parameter decreases with increasing of Cr-substituted concentration. Magnetic properties such as permeability and quality factor were measured in the frequency range of 1 kHz to 100 MHz. The permeability and quality factor of Cr-substituted lithium ferrite were strongly affected by Cr-substituted concentration. The permeability decreased gradually from μ (f = 10 MHz) = 34.9 for Li0.5Fe2.5O4 to μ (f = 10 MHz) = 4.0 for Li0.5Fe1.5Cr1.0O4. The electrical conductivity and activation energy were measured by the DC two probes technique. The temperature dependence of DC conductivity shows the semiconductor nature. A change of slope in the Arrhenius plot (log σT vs. 103/T) may be due to the ferri to paramagnetic transition. The conductivity variation shows two different regions with a large variation in the activation energy. The activation energies in the ferromagnetic region are greater than those in the paramagnetic region.

View Fulltext    |   Related Articles   |   Back
  Related Articles

No Article Found
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility