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Electrical conductivity and dielectric behaviour of nanocrystalline La0.6Gd0.1Sr0.3Mn0.75Si0.25O3

机译:纳米晶体LA0.6GD0.1SR0.3MN0.75SI0.25O3的电导率和介电行为

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摘要

An La0.6Gd0.1Sr0.3Mn0.75Si0.25O3 ceramic was prepared via a solution-based chemical technique. X-ray diffraction study confirms the formation of the compound in the orthorhombic structure with the Pnma group space. Dielectric properties have been investigated in the temperature range of 85-290 K with the frequency range 40 Hz to 2 MHz. The conductivity spectra have been investigated by the Jonscher universal power law: sigma(omega) = sigma(dc) + A omega(n), where is the frequency of the ac field, and n is the exponent. The deduced exponent 'n' values prove that a hopping model is the dominating mechanism in the material. Based on dc-electrical resistivity study, the conduction process is found to be dominated by a thermally activated small polaron hopping (SPH) mechanism. Complex impedance analysis (CIA) indicates the presence of a relaxation phenomenon and allows us to modelize the sample in terms of an electrical equivalent circuit. Moreover, the impedance study confirms the contribution of grain boundaries to the electrical properties.
机译:通过基于溶液的化学技术制备LA0.6GD0.1SR0.3MN0.75SI0.25O3陶瓷。 X射线衍射研究证实了与PNMA组空间在正交结构中形成的化合物。已经在85-290 k的温度范围内研究了介电性质,频率范围为40Hz至2MHz。由Jonscher Universal Power Law调查导电谱:Sigma(Omega)= Sigma(DC)+ A OMEGA(N),在其中AC场的频率,n是指数。推导的指数'n'值证明了跳跃模型是材料中的主导机制。基于直流电阻率研究,发现导通过程由热激活的小极化跳跃(SPH)机制主导。复杂阻抗分析(CIA)表示存在弛豫现象,并允许我们在电力等效电路方面建模样品。此外,阻抗研究证实了晶粒边界对电性能的贡献。

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  • 来源
    《RSC Advances》 |2018年第17期|共9页
  • 作者

    Dhahri Ah; Dhahri E.; Hlil E. K.;

  • 作者单位

    Univ Monastir Fac Sci Ave Environm 5019 Monastir Tunisia;

    Univ Sfax Fac Sci Sfax Lab Phys Appl BP 1171 Sfax 3000 Tunisia;

    CNRS Inst Neel BP 166 F-38042 Grenoble France;

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

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