Exploring the electromagnetic shielding behavior of lanthanum doped calcium nanoferrites  

作　　者：E.Ahilandeswari K.Sakthipandi R.Rajesh Kanna G.Rajkumar B.Ganesh Babu S.Arunmetha Aslam Hossain P.Sakthivel V.Rajendran M.Srinidhi Raghavan 

机构地区：[1]Department of Physics,SRM TRP Engineering College,Tiruchirappalli,621105,Tamil Nadu,India [2]Department of Electronics and Communication Engineering,M.Kumarasamy College of Engineering,Karur,639113,Tamil Nadu,India [3]Department of Physics,Easwari Engineering College,Chennai,600089,Tamil Nadu,India [4]Department of Mechanical Engineering,SRM TRP Engineering College,Tiruchirappalli,621105,Tamil Nadu,India [5]Centre for Advanced Energy Studies,Department of Electronics and Communication Engineering,Koneru Lakshmaiah Education Foundation,Guntur,Andhra Pradesh,522502,India [6]Smart Materials Research Institute,Southern Federal University,Sladkova 178/24,344090,Rostov-on-Don,Russia [7]Centre for Materials Science,Department of Physics,Science and Humanities,Faculty of Engineering,Karpagam Academy of Higher Education,Coimbatore,641021,Tamil Nadu,India [8]Centre for Nanotechnology,Academy of Maritime Education and Training(Deemed to be University),Chennai,603112,Tamil Nadu,India [9]Department of Chemistry and Centre for Nano-Materials and Displays,B.M.S.College of Engineering,Bengaluru,560019,Karnataka,India

出　　处：《Journal of Rare Earths》2024年第11期2128-2136,I0005,共10页稀土学报（英文版）

基　　金：Project supported by the Strategic Academic Leadership Program of the Southern Federal University(Priority 2030)。

摘　　要：The present study focuses on the synthesis and characterization of lanthanum(La^(3+))-doped calcium nanoferrites(CaLa_(x)Fe_(2-x)O_(4):x=0.025,0.050,0.075 and 0.100)using the sonochemical method.Various techniques were employed to analyze the effect of La^(3+)infusion,Raman spectroscopy confirms the presence of active A_(1g),T_(2g)and E_g modes in the CaLa_(x)Fe_(2-x)O_(4)nanoferrite,indicating the formation of an active ferrite system.The introduction of La^(3+)doping results in a significant increase in the band gap energy,rendering the nanoferrites insulating(3.23-3,57 eV).At higher frequencies,the impedance studies reveal minimal losses and better AC conductivity,pointing to improved dielectric characteristics.At higher frequencies,the Q-factor of La-doped calcium nanoferrites shows lower electromagnetic losses.The M-H curve exhibits ferromagnetic behavior,with La^(3+)-doped calcium nano ferrites displaying a saturation magnetization ranging from 12.72 to 18.10 emu/g.The incorporation of La^(3+)also induces enhanced electrical polarization,leading to notable dielectric loss and increased absorption of electromagnetic waves.Consequently,these CaLa_(x)Fe_(2-x)O_(4)nanoferrites demonstrate potential as effective microwave absorbers across a wide frequency range,with significant shielding absorption observed at 8.8-9.1 GHz.

关 键 词：NANOFERRITES Structural properties Rare earths DIELECTRIC MAGNETISM Microwave absorption 

分 类 号：TM277[一般工业技术—材料科学与工程]