@article {32120, title = {γ irradiation effect on the polarization and resistance of Li-Co-Yb-ferrite}, journal = {Journal of Physics and Chemistry of Solids}, volume = {63}, year = {2002}, note = {

Cited By (since 1996):6Export Date: 11 February 2014Source: ScopusCODEN: JPCSALanguage of Original Document: EnglishCorrespondence Address: Ahmed, M.A.; Physics Department, Faculty of Science, Cairo University, Giza, Egypt; email: moala47@hotmail.com

}, month = {2002}, pages = {279 - 286}, abstract = {

The effect of γ irradiation on some physical properties of rare earth ferrite of the general formula Li0.5+zCoz YbxFe2.5-2z-xO4, (z = 0.1, x = 0.00, 0.025, 0.050,..., 0.200) is discussed. The temperature dependence of the polarization and resistance is studied in the range (300 K <= T <= 700 K) at different frequencies (10 kHz <= f <= 1 MHz). The relaxation time and the activation energy have been calculated before and after irradiation with γ rays doses of 1 and 3 Mrad. A comparison was made between the ac resistance before and after irradiation for the samples with (0.0 <= x <= 0.2). The results after irradiation with 1 Mrad γ rays showed that the resistance at the critical concentration decreases from 800 to 25 kΩ at room temperature. Furthermore, with increasing temperature the resistance ranged from R ≈ 130 kΩ at T ≈ 310 K to R ≈ 0.13 kΩ at T ≈ 640 K. Thus, it is possible to improve the conductivity of this type of rare earth ferrite materials to be used in technological applications at room as well as at high temperature. {\textcopyright} 2001 Elsevier Science Ltd. All rights reserved.

}, keywords = {Activation energy, D. Electrical properties, Electric conductivity, Gamma rays, Irradiation, Lithium compounds, Rare earth ferrite materials}, isbn = {00223697 (ISSN)}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0036462714\&partnerID=40\&md5=cd55edc45abc446f2bc1b0d2e9125e19}, author = {M.A. Ahmed and Bishay, S.T. and F. A. Radwan} }