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首页> 外文期刊>Journal of materials science >Structural, optical, and dielectric investigations in bulk PrCrO_3
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Structural, optical, and dielectric investigations in bulk PrCrO_3

机译：散装PRCRO_3中的结构，光学和介电调查

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摘要

The polycrystalline powder samples of PrCrO_3 have been prepared using conventional solid-state synthesis method. Structural investigations are carried out using Raman spectroscopy and synchrotron X-ray diffraction (SXRD) followed by Riet-veld refinement of diffraction data. Investigations of diffraction data suggest that these samples possess centrosymmetric orthorhombic structure with space group Pnma (or Pbnm). The valence (charge) state of Cr in PrCrO_3 has been determined from X-ray absorption near edge spectroscopy (XANES). Optical properties are studied using diffuse reflectance spectroscopy technique. Optical absorption study reveals that absorption in PrCrO_3 ceramic is dominated by d-d electrons of chromium cation (Cr~(3+)). The synthesized compound found to have energy bandgap of 3.20 eV. Based on the results observed, energy level diagram for PrCrO, has been presented. High dielectric permittivity (ε′) of the order 3 × 10~3 is observed for the studied sample. Impedance spectroscopy measurement at room temperature on sintered pellet indicates electronic inhomogeneity in the samples as demonstrated by the presence of dielectric relaxation processes associated with highly conducting grain and low conducting grain boundaries. The relaxation mechanism has been explained on the basis of Cole-Cole model. Observed high dielectric permittivity (ε′) and optical energy bandgap (E_g ) indicates that PrCrO_3 may find promising application in optoelectronic devices.
机译：使用常规固态合成方法制备PRCRO_3的多晶粉末样品。使用拉曼光谱和同步速度X射线衍射（SXRD）进行结构研究，然后进行衍射数据的RIET-VELD改进。衍射数据的研究表明，这些样品具有空间组PNMA（或PBNM）的亚氨基微孔结构。已经从边缘光谱附近（Xanes）附近的X射线吸收来确定PRCRO_3中Cr的价（电荷）状态。使用漫反射光谱技术研究了光学性质。光学吸收研究表明，PRCRO_3陶瓷中的吸收是由铬阳离子的D-D电子的管制（Cr〜（3+））。合成的化合物发现3.20eV的能量带隙。基于所观察到的结果，已经提出了prcro的能级图。对于研究的样品，观察到3×10〜3的高介电常数（ε'）。在烧结颗粒上的室温下阻抗光谱学测量表明样品中的电子不均匀性，如通过与高导电晶粒和低导电晶界相关的介电弛豫过程所示。已经基于COLE-COLE模型解释了弛豫机制。观察到的高介电介电常数（ε'）和光能带隙（E_G）表示PRCRO_3可以在光电器件中找到有希望的应用。

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  • 来源
    《Journal of materials science》 |2020年第19期|16379-16388|共10页
  • 作者

    Ravikiran Late; K. V. Wagaskar; Pradip B. Shelke; Archna Sagdeo; Parasmani Rajput; Pankaj R. Sagdeo;

  • 作者单位

    Department of Physics. Ahmednagar College. Ahmednagar Maharashtra 414001 India;

    Department of Physics. Ahmednagar College. Ahmednagar Maharashtra 414001 India;

    Department of Physics. Ahmednagar College. Ahmednagar Maharashtra 414001 India;

    Synchrotron Utilization Section. Raja Ramanna Center for Advance Technology Indore Madhya Pradesh 452013. India Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai 400094 India;

    Atomic & Molecular Physics Division. Bhabha Atomic Research Centre Mumbai 400085 India;

    Material Research Laboratory Discipline of Physics & Centre for Material Science and Engineering. Indian Institute of Technology Indore. Khandwa Road Simrol Indore Madhya Pradesh 452020. India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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