Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1814884 | Physica B: Condensed Matter | 2008 | 7 Pages |
Abstract
The far-infrared spectra of six mixed ferrites (CdxCo1âx+tTitFe2â2tO4; x=0.2, 0.00⩽t⩽0.25) in the range 200-1000 cmâ1 are reported. Two strong high-frequency bands ν1 and ν2 are observed. The first one ν1 is assigned to the tetrahedral and the second ν2 is assigned to the octahedral site. A small kink ν3 around near ν2 is observed and its intensity increases with divalent octahedral metal ion concentration. Seebeck coefficient measurements showed that the substitution of tetravalent ion Ti4+ does not change the polarity of the Seebeck coefficient from p- to n-type. The activation energy and the carrier mobility μ were also calculated. The effect of mechanical pressure on the dc resistivity was investigated.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
M.A. Ahmed, S.F. Mansour, S.I. El-Dek,