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Texture-based magnetostriction calculation of oriented polycrystalline cobalt ferrites

Rare Metals 2018年第5期37卷 421-426页

作者： Ji-Quan Wang Ji-Heng Li Chao Yuan Xiao-Qian Bao Xue-Xu Gao State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083China

Oriented polycrystalline cobalt ferrites with different alignments were prepared via a ceramic method. The maximum magnetostriction λs up to -270×10^-6 was achieved for oriented samples, when the oriented magnetic field was above 1.0 T. Textures of all samples were determined by electron back-scattered diffraction （EBSD） technique and were used to calculate magnetostriction values of oriented polycrystalline cobalt ferrite samples. Results show that a preferred 〈001〉 orientation has been obtained within oriented sample. Calculation was done by considering the magnetostriction value as the sum of the content in volume fraction-weighted single-crystal behavior along [100], [110], [210], [310], [311], [211] and [111] directions. The calculated magnetostriction values when compared with experimentally obtained values show identical behavior as a function of applied magnetization orientation field. Good consistency of change rules between calculated values and measured ones illustrates the successful application of this method in predicting magnetostriction values of polycrystalline materials.

关键词： Magnetostriction calculation Oriented polycrystalline cobalt ferrites Texture

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Facile synthesis of CoFe2O4 nanoparticles anchored on graphene sheets for enhanced performance of lithium ion battery

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Progress in Natural Science:Materials International 2016年第5期26卷 498-502页

作者： Wen Qi Pei Li Ying Wu Hong Zeng Liting Hou Chunjiang Kuang Pei Yao Shaoxiong Zhou Beijing Key Laboratory of Energy Nanomaterials Advance Technology & Materials Co. Ltd China Iron & steel Research Institute Group School of Materials Science and Engineering Tianjin University

Recently, metal oxides as high capacity anode materials had been investigated for lithium ion ***, the fast capacity fading upon cycling leaded poor durability, which hindered their application as higher energy density of lithium ion battery. In this paper, a nanostructured nanocomposite with graphene supported CoFe2O4nanoparticles(NPs) was prepared via simple hydrothermal reaction. The uniform CoFe2O4NPs were anchored on graphene sheets, which brought a good performance on cyclability. Combined with the optimization of graphene content, the anode delivered a better capacity retention of 944 m A h g-1over 50 cycles at current density of 100 m A g-1and the good reversible capacity as 990 m A h g-1when the rate returned from 5 A g-1to 0.1 A g-1after 60 cycles. The present work provided a desired structure for conversion anode materials or other electrode materials of large volume change.

关键词： Graphene-based anode cobalt ferrites Lithium ion battery

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