Effect of Co substitution on the structural,dielectric and optical properties of KBiFe_(2)O_(5)

作     者：K.Chandrakanta R.Jena P.Pal Md.F.Abdullah S.D.Kaushik A.K.Singh K.Chrakanta;R.Jena;P.Pal;Md.F.Abdullah;S.D.Kaushik;A.K.Singh

作者机构：Department of Physics and AstronomyNational Institute of TechnologyRourkela-769008OdishaIndia UGC-DAE Consortium for Scientific Research Mumbai CentreR-5 ShedBARCMumbai-400085India 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2021年第28卷第11期

页      面：1861-1867页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：UGC-DAE CSR,Mumbai(Sanction No.CRS-M-187,225) Board of Research in Nuclear Science(BRNS),Mumbai(Sanction No.2012/37P/40/BRNS/2145) Science and Engineering Research Board(SERB),New Delhi(Sanction No.SR/FTP/PS-187/2011)for funding and fellowships 

主　　题：brownmillerite rietveld refinement Raman spectroscopy bandgap 

摘      要：Cobalt(Co)-modified brownmillerite KBiFe_(2)O_(5)(KBFO;[KBiFe_(2(1−x))Co_(2x)O_(5)(x=0,0.05)])polycrystalline is synthesized following the solid-state reaction *** refinement of X-ray diffraction data confirmed the phase purity of KBFO and KBiFe_(1.9)Co_(0.1)O_(5)(KBFCO).The optical bandgap energy(Eg)of KBFO decreased from 1.59 to 1.51 eV because of Co *** decrease in bandgap can be attributed to the tilting of the Fe–O tetrahedral structure of *** observed room-temperature Raman peaks of KBFCO shifted by 3 cm^(−1) toward a lower wavenumber than that of *** shift in Raman active modes can be attributed to the change in the bond angles and bond lengths of the Fe–O tetrahedral structure and modification in response to oxygen deficiency in KBFO because of Co *** with that of KBFO,the frequency-dependent dielectric constant and dielectric loss of KBFCO decrease at room temperature,which is a consequence of the reduction in oxygen migration and modification in response to vibrational modes present in the sample.