J. Ahmad, Maryam Yasmin, Uzaira Ahmad, S. H. Bukhari, U. Nissar, J. A. Khan, H. Abbas
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引用次数: 2
摘要
双钙钛矿La2-xAxFeMnO6 (A = Ca, Sr, Ba;X = 0.0, 0.4)，采用柠檬酸溶胶-凝胶自燃烧技术合成。通过x射线衍射(XRD)、傅里叶红外光谱(FTIR)研究了室温下的结构、光学和电学性能，并在303 ~ 423 K的温度范围内进行了电学和介电测量。通过Rietveld细化的XRD分析表明，所有合成的样品都具有单相正交(Pnma)对称性。红外反射率(IR)光谱由傅里叶变换红外光谱(FTIR)测量得到。用洛伦兹振子模型拟合光谱，观察光学声子模式。通过直流电阻率测量计算活化能。根据电阻率测量，样品显示出半导体性质。测量并讨论了随温度变化频率的介电常数和切线损耗。
Structural, optical, and electrical properties of alkaline earth doped La2-xAxFeMnO6 (A = Ca, Sr, and Ba) double perovskites
The polycrystalline double perovskites La2-xAxFeMnO6 (A = Ca, Sr, Ba; x = 0.0, 0.4) were synthesized through citrate sol-gel auto-combustion technique. The structural, optical, and electrical properties were studied by x-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy at room temperature, while electrical and dielectric measurements were evaluated at temperature ranges from 303 to 423 K. The XRD analysis through Rietveld refinement suggests the single phase orthorhombic (Pnma) symmetry for all the synthesized samples. The infrared reflectivity (IR) spectra were obtained from Fourier Transform Infrared spectroscopy (FTIR) measurements. The spectra were fitted by Lorentz oscillator model, to observe the optical phonon modes. The activation energies were calculated by DC resistivity measurements. According to the resistivity measurement the samples shows the semiconducting nature. The temperature dependent dielectric constant and tangent-loss with varying frequency are measured and discussed.
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