Effect of thulium substitution on conductivity and dielectric belongings of nanospinel cobalt ferrite  

作　　者：B.Unal M.A Almessiere A.Demir Korkmaz Y.Slimani A.Baykale 

机构地区：[1]Institute of Forensic Sciences and Legal Medicine,Istanbul University-Cerrahpasa,Buyukcekmece Campus,Alkent 2000,Buyukcekmece,Istanbul 34500,Turkey [2]Department of Biophysics.Institute for Research&Medical Consultations(IRMC),Imam Abdulrahman Bin Faisal University,P.O.Box 1982,31441,Dammam,Saudi Arabia [3]Department of Physics,College of Science,Imam Abdulrahman Bin Faisal University,P.O.Box 1982,31441,Dammam,Saudi Arabia [4]Department of Chemistry,Istanbul Medeniyet University,34700 Istanbul,Uskudar,Turkey [5]Department of Nano-Medicine Research,Institute for Research&Medical Consultations(IRMC),Imam Abdulrahman Bin Faisal University,P.O.Box 1982,31441 Dammam,Saudi Arabia

出　　处：《Journal of Rare Earths》2020年第10期1103-1113,I0003,共12页稀土学报（英文版）

基　　金：The Institute for Research and Medical Consultations of Imam Abdulrahman Bin Faisal University (Saudi Arabia) is highly acknowledged for providing the supports through the Projects application No.2019-IRMC-S-1。

摘　　要：The CoTmx Fe2-x O4(x≤0.1) NPs were synthesized sonochemically.X-ray powder diffraction patterns and TEM images of the samples prove their chemical purity and cubic structure-morphology,respectively.Some substitution ratio of thulium ions to cobalt ferrites have an important effect on the characteristic evaluation of both electrical and dielectric characteristic measured at frequencies up to 3.0 MHz between room temperature and 120℃.Since the thulium substitution has a very strong effect on the characteristic evaluation of both electrical and dielectric properties of cobalt-ferrite samples,four substitutio nal ranges-none,small,medium and high were determined for the interpretation of contribution of thulium ratio to ac/dc conductivity,dielectric constant,dielectric loss and tangent loss.Conductivity increases with the incremental frequencies,in general depending on a variety of tendencies of both temperature and substitutional Tm ratios while the activation energy varies with a high dependency to the regional level of Tm substitution in Co-ferrites NPs.The Arrhenius graph appears to provide us with a single activation energy much higher than 400 meV for x=0.02,which can be attributed to electron hopping mechanisms,apart from other substituted spinel ferrites.

关 键 词：Spinel ferrites Dielectric properties CONDUCTIVITY COFE2O4 Tm3+substitution Rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]