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1Role of composition and grain size in controlling the structure sensitive magnetic properties of Sm substituted nanocrystalline Co-Zn ferrites显示文摘The nanocrystalline samarium substituted Co-Zn ferrites with chemical formula Co0.7Zn0.3SmyFe2-yO4(where y=0,0.01,0.02,0.03,0.04) were synthesized by sol-gel autocombustion route.The analysis of Xray diffractograms(XRD) reveals the formation of cubic spinel structure.The planes indexed from XRD analyses were confirmed in the selected area electron diffraction(SAED) image of the sample.Nanocrystalline nature of the particles in the ferrite samples was confirmed by TEM.The morphology was analyzed by scanning electron microscopy(SEM).Magnetic measurements show an increase in the magnetization for x ≤0.03.The decrease in magnetization due to spin canting is observed for x=0.04.The coercivity depends on Sm3+doping concentration,grain size and saturation magnetization.The complex permeability of the ferrites was analyzed as the function of frequency and Sm3+composition(y).The real part of complex permeability varies linearly with the grain size.Anil B.Mugutkar Shyam K.Gore Umakant B.Tumberphale Vijaykumar V.Jadhav Rajaram S.Mane Sunil M.Patange Sagar E.Shirsath Santosh S.Jadhav 2020Journal of Rare Earths2020,38,10:1
2溶胶-凝胶法制备Ni_(1-x)Zn_xFe_2O_4及其Zn^(2+)掺杂对磁性质的影响显示文摘采用溶胶-凝胶法制备了系列Ni_(1-x)Zn_xFe_2O_4(x=0,0.2,0.4,0.6,0.8,1.0)粉末样品,利用X射线衍射(XRD)、场发射扫描电镜(FESEM)和振动样品磁强计(VSM)对样品的晶体结构、形貌及磁性进行了研究.结果表明,750℃是制备样品的最佳煅烧温度,在此温度下制备的Ni_(1-x)Zn_xFe_2O_4均为单一尖晶石相.NiFe2O4纳米颗粒类似球形,大小均匀且分散性好;掺杂Zn^(2+)后,颗粒尺寸增大,有少量团聚.随着Zn^(2+)含量的增加,饱和磁化强度(Ms)先增大后减小,在x=0.4时达最大值,Ms=65.63emu·g^(-1);矫顽力Hc呈现持续降低趋势,x=0时有较高的矫顽力,Hc=196.09Oe.潘伟伟 张杨 罗月娥 刘世华 2017西北师范大学学报(自然科学版)2017,53,6:1
3Sintering temperature reflected cation distribution of Zn^(2+) substituted CoFe_2O_4显示文摘The most remarkable effect in spinel ferrites is the strong dependence of properties on the state of structural disorder and,in particular,on the cation distribution.The structural characterization of a Co-Zn ferrite nanoparticle sample was reported which prepared by wet chemical co-precipitation method.The samples were sintered at three different temperatures viz.650℃,850℃ and 1050℃ for 12 h.The structural details like:lattice constant and distribution of cations in the tetrahedral and octahedral interstitial voids have been deduced through X-ray diffraction (XRD) data analysis.Lattice constant was found to increase with the increase in Zn2+ ions and sintering temperature.Theoretical intensity ratios of (220),(400),(440) planes were considered,as these reflections are sensitive to cations on the A and B sites.Close agreement of the theoretical intensity ratio with the intensity ratio observed from XRD pattern supports the occupancy of Zn2+ ions and Co2+ ions on the octahedral and tetrahedral sites,respectively.Sanjay R.Kamble Sagar E.Shirsath S.M.Patange K.M.Jadhav 2013Journal of Central South University2013,20,6:0
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