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Effect of Mn doping on structural, morphological and dielectric properties of EuFeO3 ceramics

机译：Mn掺杂对EufeO3陶瓷结构，形态学和介电性能的影响

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摘要

Polycrystalline compounds of EuFe_(1-x)Mn_xO3 (x = 0.0, 0.3, 0.5) were synthesized by a standard solid state reaction technique. These compounds were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and dielectric properties. The Rietveld analysis of the XRD profiles clearly indicated that these compounds are well fitted with an orthorhombic structure and space group Pbnm. Raman spectral features revealed their fingerprint modes and irreducible representations at the Brillouin zone center as per the group theory. The surface morphologies from SEM images revealed that the average grain size increases with Mn doping. Energy dispersive X-ray analysis indicated the presence of Eu, Fe, Mn and oxygen. The dielectric properties were studied as a function of frequency and temperature. Absence of any loss peak in the dielectric dispersion suggests its behaviour to be that of a quasi-dc-process (QDC). The increase of dielectric constant with Mn doping suggests that small polarons contribute to the conduction mechanism.
机译：通过标准固态反应技术合成了Eufe_（1-X）Mn_XO3（X = 0.0,0.3,0.5）的多晶化合物。这些化合物的特征在于X射线衍射（XRD），拉曼光谱，扫描电子显微镜（SEM）和介电性质。 XRD型材的RIETVELD分析清楚地表明这些化合物很好地配备了矫正结构和空间组PBNM。根据本集团理论，拉曼光谱特征在布里渊区中心揭示了他们的指纹模式和不可缩小的表示。 SEM图像的表面形态显示，平均晶粒尺寸随Mn掺杂而增加。能量分散X射线分析表明欧盟，Fe，Mn和氧气的存在。研究了介电性能作为频率和温度的函数。在介电分散中没有任何损耗峰表明其行为是准直流处理（QDC）的行为。掺杂的介电常数的增加表明，小极化子有助于传导机构。

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  • 来源
    《RSC Advances》 |2015年第114期|共10页
  • 作者

    Khalid Sultan; M. Ikram; K. Asokan;

  • 作者单位

    Department of Physics National Institute of Technology Hazratbal Srinagar J &

    K-190006 India.;

    Department of Physics National Institute of Technology Hazratbal Srinagar J &

    K-190006 India.;

    Materials Science Division Inter University Accelerator Centre Aruna Asaf Ali Marg New Delhi-110067 India;

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  • 正文语种 eng
  • 中图分类 化学;
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