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首页> 外文期刊>Materials Science and Engineering >Structural, dielectric, magnetic, magnetodielectric and impedance spectroscopic studies of multiferroic BiFeO_3-BaTiO_3 ceramics
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Structural, dielectric, magnetic, magnetodielectric and impedance spectroscopic studies of multiferroic BiFeO_3-BaTiO_3 ceramics

机译：多铁性BiFeO_3-BaTiO_3陶瓷的结构，介电，磁，磁电和阻抗谱研究

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摘要

Polycrystalline (l-x)BiFeCh-xBaTiCh (x = 0.00, 0.10. 0.20 and 0.30) ceramics have been prepared via mixed oxide route. The effect of BaTiCh substitution on the dielectric, ferroelectric and magnetic properties of the BiFeO_3 multiferroic perovskite was studied. From XRD analysis it revealed that BaTiCh substitution does not affect the crystal structure of the (1-x)BiFeCh-xBaTiCh system up to x = 0.30. Improved dielectric properties were observed in the prepared system. An anomaly in the dielectric constant (e) was observed in the vicinity of the antiferromagnetic transition temperature. Experimental results suggest that in the (l-x)BiFeO_3-xBaTiO_3 system, the increase of BaTiCh concentration leads to the effective suppression of the spiral spin structure of BiFeO_3, resulting in the appearance of net magnetization. The dependence of dielectric constant and loss tangent on the magnetic field is a evidence of magnetoelectric coupling in (1 -x)BiFeCh-xBaTiO_3 system. The impedance analysis suggests the presence of a temperature dependent electrical relaxation process in the material, which is almost similar for all the concentrations in the present studies. The electrical conductivity has been observed to increase with rise in temperature showing a typical negative temperature coefficient of the resistance (NTCR) behaviors analogous to a semiconductor and suggests a non-Debye type of electrical relaxation.
机译：已经通过混合氧化物途径制备了多晶（1-x）BiFeCh-xBaTiCh（x ＝ 0.00、0.10、0.20和0.30）陶瓷。研究了BaTiCh替代对BiFeO_3多铁钙钛矿的介电，铁电和磁性的影响。从XRD分析可知，直到x = 0.30时，BaTiCh取代并不影响（1-x）BiFeCh-xBaTiCh系统的晶体结构。在制备的系统中观察到改善的介电性能。在反铁磁转变温度附近观察到介电常数（e）异常。实验结果表明，在（1-x）BiFeO_3-xBaTiO_3体系中，BaTiCh浓度的增加导致BiFeO_3螺旋自旋结构的有效抑制，导致出现净磁化。介电常数和损耗角正切对磁场的依赖性是（1-x）BiFeCh-xBaTiO_3系统中磁电耦合的证据。阻抗分析表明材料中存在取决于温度的电弛豫过程，这与本研究中的所有浓度几乎相似。已经观察到电导率随温度的升高而增加，显示出类似于半导体的典型的负电阻（NTCR）行为的负温度系数，并暗示了非德拜类型的电弛豫。

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  • 来源
    《Materials Science and Engineering》 |2011年第7期|p.540-547|共8页
  • 作者

    Hemant Singh; Amit Kumar; K.L. Yadav;

  • 作者单位

    Smart Materials Research Laboratory, Department of Physics. Indian Institute of Technology Roorkee. Roorkee 247667. India;

    Smart Materials Research Laboratory, Department of Physics. Indian Institute of Technology Roorkee. Roorkee 247667. India;

    Smart Materials Research Laboratory, Department of Physics. Indian Institute of Technology Roorkee. Roorkee 247667. India;

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  • 正文语种 eng
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  • 关键词

    dielectric; antiferromagnetic; multiferroic; magnetoelectric; ceramics;

    机译：电介质反铁磁多铁性磁电陶瓷;

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