Document Details Document Type : Article In Journal  Document Title : IR spectra and dielectric properties of Cu-Ge ferrite IR spectra and dielectric properties of Cu-Ge ferrite   Subject : Physics  Document Language : English  Abstract : The mixed ferrite Cu1+xGexFe2-2xO 4; where x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3; was prepared from high purity oxides using the standard ceramic technique. The IR spectra were recorded on the range from 200 to 1000 cm-1. The two primary bands corresponding to tetrahedral νA and octahedral νB were observed around 575 cm-1 and 400 cm -1, respectively. It was found the threshold frequency νth for the electronic transition increases with increasing the Ge content. The Debye's temperature θD was calculated and it was found dependent on the type of charge carriers. AC conductivity σac with dielectric properties (dielectric constant ε′, dielectric loss ε″ and loss tangent tan δ) as a function of frequency (f = 102 → 106 Hz) at room temperature have been measured. The dispersion of the dielectric properties was discussed in the light of Koop's phenomenological theory. The phonon frequency νph which calculated from IR spectra for each composition of Cu-Ge ferrite was found to be higher than that calculated from the AC conductivity by a factor of about 104-105 Hz.  ISSN : 0254-0584  Journal Name : Materials Chemistry and Physics  Volume : 130  Issue Number : 3  Publishing Year : 1432 AH 2011 AD  Article Type : Article  Added Date : Monday, April 9, 2012  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email Said A Mazen Mazen, Said A Researcher Doctorate dr.saidmazen@gmail.com علي محمد عبدالدايم Abdel Daiem, Ali Mohamed Researcher Doctorate abdeldaiem@hotmail.com Files File Name Type Description  32798.pdf pdf Abstract Back To Researches Page