Document Details Document Type : Article In Journal  Document Title : Far-infrared spectra for copperzinc mixed ferrites Far-infrared spectra for copperzinc mixed ferrites   Subject : Physics  Document Language : English  Abstract : Infrared spectra of Zn2 ions substituted Cu ferrites with the general formula Cu1-xZnxFe2O4 (where x=0.0, 0.2, 0.4, 0.6, 0.8 and 1) have been analyzed in the frequency range 2001000 cm-1. These mixed ferrites were prepared by the standard double sintering ceramic method. Two prominent bands were observed, high-frequency band ν1 around 550 cm-1 and low-frequency band ν2 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 ν3 was observed around 310 cm-1. This indicates the migration of some Zn2 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 νth 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.  ISSN : 0921-4526  Journal Name : Physica B: Condensed Matter  Volume : 405  Issue Number : 21  Publishing Year : 1431 AH 2010 AD  Article Type : Article  Added Date : Saturday, October 15, 2011  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email هشام زكي Zaki, Hisham Researcher Doctorate dakdik2001@yahoo.com H A Dawoud Dawoud, H A Researcher Doctorate   Files File Name Type Description  31035.pdf pdf Abstract Back To Researches Page