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首页> 外文期刊>Physica, B. Condensed Matter >The structural and multiferroic properties of (Bi_(1-x)La_x)(Fe_0.95Co_0.05)O_3 ceramics
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The structural and multiferroic properties of (Bi_(1-x)La_x)(Fe_0.95Co_0.05)O_3 ceramics

机译：（Bi_（1-x）La_x）（Fe_0.95Co_0.05）O_3陶瓷的结构和多铁性

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摘要

La and Co co-doped BiFeO_3 ((Bi_(1-x)La_x)(Fe_0.95Co_0.05)O_3 (x=0, 0.10, 0.20, 0.30)) ceramics were prepared by tartaric acid modified sol-gel method. The X-ray diffraction patterns indicate a transition from rhombohedral structure to tetragonal structure at x=0.20, which has been confirmed by the Raman measurements. The band gap increases with increasing x to 0.20, and then decreases with further increasing x to 0.30. The structural transition has significant effects on the multiferroic properties. The remnant magnetization and saturate ferromagnetic magnetization decrease abruptly with increasing x to 0.10, and then gradually increase with further increasing x up to 0.30. The coercivity is significantly reduced with increasing La doping concentration. The ferroelectricity has been improved by La doping, and the polarization increases with increasing x to 0.10, then decreases with further increasing x up to 0.30. The simultaneous coexistence of soft ferromagnetism and ferroelectricity at room temperature in tetragonal Bi_0.70La_0.30Fe_0.95Co_0.05O_3 indicates the potential multiferroic applications.
机译：通过酒石酸改性的溶胶-凝胶法制备了La和Co共掺杂的BiFeO_3（（Bi_（1-x）La_x）（Fe_0.95Co_0.05）O_3（x = 0，0.10，0.20，0.30））陶瓷。 X射线衍射图表明在x ＝ 0.20时从菱形结构向四方结构的转变，这已经通过拉曼测量得到了证实。带隙随着x增加到0.20而增加，然后随着x进一步增加到0.30而减小。结构转变对多铁性有重要影响。剩余磁化强度和饱和铁磁磁化强度随着x增加到0.10突然减小，然后随着x进一步增加到0.30逐渐增加。随着La掺杂浓度的增加，矫顽力显着降低。 La掺杂改善了铁电性，极化随着x增大到0.10而增加，然后随着x进一步增大到0.30而减小。四方形Bi_0.70La_0.30Fe_0.95Co_0.05O_3中的软铁磁和室温铁电的并存表明了潜在的多铁性应用。

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