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Presence of neodymium and gadolinium in cobalt ferrite lattice:Structural,magnetic and microwave features for electromagnetic wave absorbing

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Journal of Rare Earths 2020年第4期38卷 411-417页

作者： Alireza Nikzad Roghaieh Parvizi Department of Physics College of SciencesYasouj UniversityYasouj75914-353Iran

In this work,neodymium substituted gadolinium-cobalt ferrite nanoparticles were synthesized by hydrothermal *** significant role of doping both the Nd3+and Gd3+ions to cobalt ferrite in manipulating the cation distribution and further in influencing structural and magnetic properties was experimentally studied and *** influence of Nd3+substitution was investigated with step of 0.02-0.1 into the optimized Gd-Co *** crystal structure formation and crystallite size were explored by X-ray diffraction analysis in which the crystallite size and lattice constant decrease with increasing the Nd3+*** microstructural properties were studied by field emission scanning electron microscopy and atomic force microscopy *** obtained structural and morphological results reveal that the substitution of Nd3+with more than 0.06 into the Gd-Co ferrites will change the material be havior and *** saturation magnetization and coercivity values were measured using a vibration sample magnetometer at room *** microwave absorption experiments demonstrate that the reflection loss properties enhance with increasing substitution of Nd3+cations in Gd-Co ferrite spinel *** research reports that the as-prepared Nd3+substituted Gd-Co ferrite compound stands as promising candidate for absorbing electromagnetic wave with a wider absorbing bandwidth of X-band.

关键词： Gd-Co nanoferrite Coercive field Microwave absorption Rare earths

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The Effect of Mg2+Substitution with Li1+on Structural and Optical Properties of Zn0.5Li2xMg0.5-xFe2O4Nanoparticles

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Open Journal of Applied Sciences 2019年第9期9卷 702-709页

作者： N.A.Elthair Yousef A.Alsabah Eltayeb M.Mustafa Abdelrahman A.Elbadawi Abdal Sakhi.Suliman Department of Physics Faculty of Science and TechnologyAl Neelain UniversityKhartoumSudan Department of Physics Faculty of ScienceJazan UniversityJazanKSA Department of Physics Faculty of Education and Applied ScienceHajjah UniversityHajjahYemen Faculty of Basic Studies Future UniversityKhartoumSudan

nanoferrite materials had been synthesized to produce new alternate substance for reducing the rare or high cost of industrial materials. In this work, the Zn0.5Mg0.5-xLi2xFe2O4 nanoferrite (x = 0.00, 0.10, 0.20, 0.30 and 0.40) was prepared by co-precipitation approach. Structural and optical properties were investigated for the Zn0.5Mg0.5-xLi2xFe2O4 series by X-ray diffraction (XRD), Fourier transforms infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopies. The XRD data showed that all samples of Zn0.5Mg0.5-xLi2xFe2O4 series possess a cubic spinel with a space group (Fd-3m) structure and crystallite size decreased from 116 to 96 nm with a doping ratio. Lattice parameter founded to increases with Li1+ ratio that result in the larger ionic radius of the Li1+ cation. FTIR result verified the formation of spinel structure by appearance of the absorption bands around 420, 580 cm-1. The energy band gap computed for Zn0.5Mg0.5-xLi2xFe2O4 samples and it founded in the range of 3.28 - 3.12eV.

关键词： Crystal Structure FTIR Zn-Li nanoferrite XRD Uv.vis Zn-Li Nanoparticles

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