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Surface agglomeration is beneficial for release of magnetic property via research of rare earth (RE) element-substitution

机译:通过研究稀土(RE)元素取代作用,表面结块有利于释放磁性

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摘要

BiFeO3 (BFO) thin films and Rare-Earth (RE) element substitutions were successfully fabricated on silicon substrates by sol-gel technology. Multiferroic properties of BFO had been improved considerably on RE (La, Ho, Er)-substitution at Bi site. The RE-substitution principle was presented in Fig. 1(the simulative images of ions matching). The single phase and the perovskite based rhombohedral structure with R3c space group of BFO and RE-substitution films were confirmed through the full pattern fitting of surface and section XRD profiles. There were obvious agglomeration phenomena for RE-substitution films via FESEM patterns, and the AFM images shown that the RE-substation films possessed smoother surface texture comparing with the BFO. The RE-substitution films showed higher saturation magnetization (Ms) and remanent magnetization (Mr) due to the reduced concentration of defects (oxygen vacancy), RE ions with smaller radii size (size effect) and surface structure of compactness. Fe3+ and O2- ions play an essential role in superexchange interaction, the XPS, surface and vertical EDS images revealed increasing tendency of Fe3+ ions and O2- ions. (C) 2017 Elsevier B.V. All rights reserved.
机译:通过溶胶-凝胶技术成功地在硅衬底上制备了BiFeO3(BFO)薄膜和稀土(RE)元素替代品。在Bi站点的RE(La,Ho,Er)取代处,BFO的多铁性得到了很大的改善。 RE替代原理如图1所示(离子匹配的模拟图像)。通过表面和截面XRD轮廓的全图拟合,证实了具有BFO和RE替代膜的R3c空间群的单相和基于钙钛矿的菱面体结构。通过FESEM图可知,RE替代膜具有明显的团聚现象,AFM图像表明,与BFO相比,RE替代膜具有更光滑的表面纹理。由于缺陷浓度的减少(氧空位),具有较小半径尺寸的RE离子(尺寸效应)和致密性的表面结构,RE替代膜表现出更高的饱和磁化强度(Ms)和剩余磁化强度(Mr)。 Fe3 +和O2-离子在超交换相互作用中起着至关重要的作用,XPS,表面和垂直EDS图像显示Fe3 +离子和O2-离子的增加趋势。 (C)2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Applied Surface Science》 |2018年第ptaa期|745-752|共8页
  • 作者单位

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

    Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Jilin, Peoples R China;

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

    Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    BiFeO3; Substitution; Magnetic materials; Perovskite structure;

    机译:BiFeO3替代磁性材料钙钛矿结构;
  • 入库时间 2022-08-18 03:04:38

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