Sm^(3+)induced structural phase transition,spectral,morphological,magnetic,dielectric and impedance properties of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4) nanoferrites  

作　　者：K.Rajashekhar G.Vinod K.Mahesh Kumar G.Harikishan Laxman Naik J 

机构地区：[1]Department of Physics,University College of Science,Osmania University,Hyderabad,500007,Telangana,India [2]Department of Physics,Kamala Institute of Technology and Science,Huzurabad,505468,Telangana,India [3]Department of Physics,CMR College of Engineering&Technology,Hyderabad,501401,Telangana,India

出　　处：《Journal of Rare Earths》2023年第11期1736-1745,I0003,共11页稀土学报（英文版）

基　　金：Kamala Institute of Technology and Science for their support and encouragement;CSIR-New Delhi for providing financial assistance (09/132 (0879)/2018-EMR-1);CSIR-New Delhi for providing financial assistance;CMR College of Engineering and Technology for their support and encouragement。

摘　　要：In the present study,rare earth samarium(Sm^(3+))substituted Ni-Cu spinel ferrites with the composition of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4)(0≤x≤0.05 in steps of 0.01)were synthesized by using the citrate induced sol-gel auto combustion technique.These ferrites'structural,optical,magnetic,and dielectric studies were carried out using X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),ultraviolet-visible(UV-vis),a vibrational sample magnetometer(VSM),and an LCR meter.The pure Ni-Cu ferrite exhibits a tetragonal structure owing to the presence of the John Tellar ion(Cu^(2+)).XRD patterns confirm that the tetragonal structure gradually transforms into the cubic spinel structure with samarium substitution.The nano-scale structures of these ferrites were confirmed by the average crystallite size(10.11-20.99 nm)derived from the X-ray diffraction patterns,and grain size(42.60-83.36 nm)assessed from FESEM photographs.The existence of elements according to their chemical composition was verified by using energy dispersive X-ray(EDX)spectra.The absorption bands(v_(1) and v_(2))detected in FTIR transmission spectra below the wavenumber of 600 cm^(-1)reveal the stretching vibrations of M-O bonds in the spinel structure at tetrahedral and octahedral locations.The band gap ene rgy obtained from UV absorption reveals the semiconducting nature of the samples.The high saturation magnetization(M_(s))is noticed at 15 K temperature for x=0.02 composition as 32.98 emu/g,while at 300 K for x=0.01composition as 27.61 emu/g.The suggested cation distribution is in good agreement with observed and predicted magnetic moment values at 300 K.The expected behavior of ferrites reveals the observed dielectric constant,loss tangent,and ac-conductivity values in the frequency range of 20 Hz-20 MHz.Cole-Cole plots confirm that the impedance contribution is attributed to grain boundaries.

关 键 词：NANOFERRITES XRD Magnetic properties Dielectric properties Cole-cole plots Rare earths 

分 类 号：O61[理学—无机化学]