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Structural,magnetic,and acidic properties of cobalt ferrite nanoparticles synthesised by wet chemical methods

Journal of Advanced Ceramics 2015年第3期4卷 199-205页

作者： Manju KURIAN Smitha THANKACHAN Divya S.NAIR Aswathy E.K. Aswathy BABU Arathy THOMAS Binu KRISHNA K.T. Department of Chemistry Mar Athanasius CollegeKothamangalam-686666India Department of Physics Mar Athanasius CollegeKothamangalam-686666India

A detailed investigation on the effect of preparation method on the structural,magnetic,and acidic properties of cobalt ferrite nanoparticles prepared by sol-gel and co-precipitation is presented.Citric acid and ethylene glycol were used as gelling agents,while sodium hydroxide and aqueous ammonia were used as precipitating agents.The resulting ferrites were calcined at 450℃ and 750℃.Sharper X-ray diffraction(XRD)peaks were observed for the samples calcined at 750℃,indicating greater crystallinity of the samples calcined at higher temperature.Average crystallite sizes fell in the ranges of 7.1-21.1 nm and 30.4-42.1 nm for the samples calcined at 450℃ and 750℃,respectively.The infrared spectra revealed two main absorption bands,the high frequency bandν1 around 600 cm^(-1) and the low frequency bandν2 around 400 cm^(-1) arising from stretching vibrations of the oxygen bond with the metal in the tetrahedral(A)and octahedral(B)sites in the spinel lattice.Agglomeration of particles was observed in the scanning electron microscopy(SEM)images.Magnetic parameters of CoFe_(2)O_(4) nanoparticles greatly depended on calcination temperature and preparation techniques.Ammonia temperature programmed desorption(TPD)measurements indicated that weak acid sites predominate medium strength sites,while the number of strong acid sites is the least.Cumulative acidity decreased for the samples calcined at higher temperature.The results underline the effect of preparation conditions on the morphology,crystallite size,and magnetic properties of nano ferrites.

关键词： nano ferrites sol-gel technique co-precipitation magnetic property surface acidity

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Physical Properties Study of Zn_(0.5)Mn_(0.5−x)Li_(2x)Fe_(2)O_(4) nanoparticle Series that Prepared by Co-Precipitation Method

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Journal of Materials Science and Chemical Engineering 2019年第11期7卷 15-21页

作者： N.A.Elthair Yousef A.Alsabah Eltayeb M.Mustafa Abdelrahman A.Elbadawi Abdal Sakhi Suliman Ali A.S.Marouf Department of Physics Faculty of Science and TechnologyAl Neelain UniversityKhartoumSudan Department of Physics Faculty of ScienceJazan UniversityJazanKingdom of Saudi Arabia Department of Physics Faculty of Education and Applied ScienceHajjah UniversityHajjahYemen Faculty of Basic Studies Future UniversityKhartoumSudan Institute of Laser Sudan University of Science and TechnologyKhartoumSudan

Co-precipitation is an important issue in chemical analysis, where it is often undesirable, but in some cases, it can be exploited. The Zn0.5Mn0.5−xLi2xFe2O4 nanomaterials (x = 0.0, 0.1, 0.2, 0.3 and 0.4) was afforded by utilizing co-precipitation method. The structural and optical characteristics were analyzed for the samples employing X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and Ultraviolet-visible spectrophotometer (UV-Vis). XRD revealed that the structure of certain nanoparticles is a cubic spinel with space group (Fd-3m) and crystallite size in the scale 124 - 150 nm. Lattice parameter was determined to increments with Li+1 and that may occur due to the larger ionic radius of the Li1+ ion. FTIR spectroscopy confirmed the form of spinel ferrite and explicated the properties of absorption bands approximately 593, 1111, 1385, 1640, 2922 and 3430. The energy band gap was estimated for all samples with diverse ratios and was observed in the range of 2.58 - 2.52 eV.

关键词： Zn_(0.5)Mn_(0.5-x)Li_(2x)Fe_(2)O_(4) nano ferrites XRD UV.vis FTIR Co-Precipitation Spinel Structure Ferrite nanoparticles Optical Properties

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The Electrical and Optical Properties of Zn0.5Li2xMg0.5-xFe2O4 Lithium Doped nanoparticle Prepared by Coprecipitation Method

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Open Journal of Applied Sciences 2020年第9期10卷 551-560页

作者： Nisreen A. Elthair Eltayeb M. Mustafa Abdelrahman A. Elbadawi Department of Physics Faculty of Science and Technology Al Neelain University Khartoum Sudan Department of Physics Faculty of Science Jazan University Jazan KSA Faculty of Basic Studies Future University Khartoum Sudan

In this study, nano ferrite materials were produced to replace costive industrial materials [1]. Ferrite nanoparticles are the interesting material due to their rich and unique physical and chemical properties. They find applications in catalysis, bio-processing, medicine, magnetic recording, adsorption, devices etc. Using co-participation method, five nano ferrite samples Zn0.5Mg0.5-xLi2xFe2O4 (x = 0.00, 0.10, 0.20, 0.30 and 0.40) were prepared. The electrical and optical properties of the Zn0.5Mg0.5-xLi2xFe2O

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