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Far-infrared spectra for copper-zinc mixed ferrites
Faculty
Science
Year:
2010
Type of Publication:
Article
Pages:
4476-4479
Authors:
Zaki, H. M, Dawoud, H. A
DOI:
10.1016/j.physb.2010.08.018
Journal:
PHYSICA B-CONDENSED MATTER ELSEVIER SCIENCE BV
Volume:
405
Research Area:
Physics
ISSN
ISI:000283209400016
Keywords :
IR spectra, Ferrite, Threshold frequency, Half bandwidth
Abstract:
Infrared spectra of Zn(2+) ions substituted Cu ferrites with the general formula Cu(1-x)Zn(x)Fe(2)O(4) (where x=0.0, 0.2, 0.4, 0.6, 0.8 and 1) have been analyzed in the frequency range 200-1000 cm(-1). These mixed ferrites were prepared by the standard double sintering ceramic method. Two prominent bands were observed, high-frequency band v(1) around 550 cm(-1) and low-frequency band v(2) around 395 cm(-1) and assigned to tetrahedral and octahedral sites for spinel lattice, respectively. On introducing zinc ions IR spectra indicate new shoulders or splitting on tetrahedral absorption bands around 600 and 700 cm(-1). A small absorption band v(3) was observed around 310 cm(-1). This indicates the migration of some Zn(2+) ions to octahedral site. Another small weak absorption band was also observed around 265 cm(-1); its intensity increased with Zn content. Force constant was calculated for both tetrahedral and octahedral sites. Threshold frequency v(th) for the electronic transition was determined and found to increase with an increase in Zn ions. The half bandwidth for each site was calculated and the ratio seemed to increase with an increase in zinc content. The cation distribution for these ferrites was estimated in the light of IR spectra. (C) 2010 Elsevier B.V. All rights reserved.
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