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magnetic behaviors of cerium oxide-based thin films deposited using electrochemical method

Chinese Physics B 2014年第9期23卷 432-438页

作者：彭英姿李源白茹霍德璇钱正洪 School of Science Hangzhou Dianzi University Center for Integrated Spintronic Devices Hangzhou Dianzi University College of Materials and Environmental Engineering Hangzhou Dianzi University

Zn and Co multi-doped CeO2 thin films have been prepared using an anodic electrochemical method. The structures and magnetic behaviors are characterized by several techniques, in which the oxygen states in the lattice and the absorptive oxygen bonds at the surface are carefully examined. The absorptive oxygen bond is about 50% of the total oxygen bond by using a semi-quantitative method. The value of actual stoichiometry δ′ is close to 2. The experimental results indicate that the thin films are of a cerium oxide-based solid solution with few oxygen vacancies in the lattice and many absorptive oxygen bonds at the surface. Week ferromagnetic behaviors were evidenced by observed M-H hysteresis loops at room temperature. Furthermore, an evidence of relative ferromagnetic contributions was revealed by the temperature dependence of magnetization. It is believed that the ferromagnetic contributions exhibited in the M-H loops originate from the absorptive oxygen on the surface rather than the oxygen vacancies in the lattice.

关键词： cerium oxide-based thin films anodic electrochemical method absorptive oxygen magnetic behaviors

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Ionothermal Synthesis, Structure, Thermal Properties and magnetic behaviors of a Novel Dinuclear Copper(Ⅱ) Coordination Compound

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Chinese Journal of Structural Chemistry 2020年第5期39卷 978-982页

作者： ZHAO Xiao-Yang Department of Environmental Engineering Henan Polytechnic InstituteNanyang 473009China

A novel dinuclear copper(Ⅱ)coordination compound,[CuⅡ(Hpdc)(phen)Cl][CuⅡ(pdc)(phen)]·4 H2 O(1,H2 pdc=pyridine-2,6-dicarboxylic acid,phen=1,10-phenanthroline),has been obtained by an ionothermal method using the ionic liquid 3-butyl-1-methylimidazolium bromide([Bmim]Br)as solvent,and fully characterized by elemental analyses,energy-dispersive X-ray spectroscopy(EDX),IR and single-crystal X-ray diffraction.1 belongs to the triclinic system,space group■with a=11.406(4),b=11.801(5),c=16.093(6)?,α=106.124(6)°,β=113.480(7)°,γ=93.853(7)°,Z=2,V=1942.3(13)?3,Dc=1.570 g·cm-3,F(000)=928,μ=1.235 mm-1,the final R=0.0588,wR=0.1369 and S=*** compound exhibits a two-dimensional layered structure constructed by[CuⅡ(Hpdc)(phen)Cl]and[CuⅡ(pdc)(phen)]fragments via the hydrogen bonds andπ-πstacking *** addition,its thermal properties and magnetic behaviors were also studied in *** magnetic properties revealed that there is a ferromagnetic interaction between Cu…Cu in 1.

关键词： ionothermal dinuclear π-πstacking interactions thermal properties magnetic behaviors

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Microstructure,tribological behavior and magnetic properties of Fe−Ni−TiO_(2) composite coatings synthesized via pulse frequency variation

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3800-3813页

作者： Ebrahim YOUSEFI Shahriar SHARAFI Ahmad IRANNEJAD Department of Materials Science and Engineering Shahid Bahonar University of Kerman*** KermanIran Young Researchers Society Shahid Bahonar University of Kerman*** KermanIran

The Fe−Ni−TiO_(2) nanocomposite coatings were electrodeposited by pulse frequency *** results showed that the nanocomposite with a very dense coating surface and a nanocrystalline structure was produced at higher *** increasing the pulse frequency from 10 to 500 Hz,the iron and TiO_(2) nanoparticles contents were increased in expense of nickel *** patterns showed that by increasing the frequency to 500 Hz,an enhancement of BCC phase was observed and the grain size of deposits was reduced to 35 *** microhardness and the surface roughness were increased to 647 HV and 125 nm at 500 Hz due to the grain size reduction and higher incorporation of TiO_(2) nanoparticles into the Fe−Ni matrix(5.13 wt.%).Moreover,the friction coefficient and wear rate values were decreased by increasing the pulse frequency;while the saturation magnetization and coercivity values of the composite deposits were increased.

关键词： Fe−Ni alloy coatings electrodeposition pulse frequency tribomechanical properties magnetic behaviors

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