Hema Chandra Rao Bitra, A. Rao, K. S. Babu, G. N. Rao
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引用次数: 1
摘要
摘要:采用固相反应法合成了掺杂碳的氧化铜(CuO)1 -x C x (x = 0、0.05和0.1)样品,并在850℃下烧结12 h。x射线衍射(XRD)结果表明,样品呈单斜晶型结构。在温度为80k ~ 300k,频率为20hz ~ 1mhz的范围内,通过阻抗分析仪对样品进行介电特性研究。掺杂样品的介电常数和正切损耗值随掺杂浓度的增加而增加。在交流电导率研究中,0%和10%掺杂碳样品的电导率机制遵循相关势垒跳变(CBH)模型,5%掺杂碳样品的电导率机制遵循量子力学隧穿(QMT)模型。随温度变化的电导率曲线似乎服从Arrhenius行为。根据频率相关的电导率曲线计算了活化能值。cole-cole图显示了样品中晶粒和晶界的形成。
Low temperature investigation on dielectric properties of carbon doped copper oxide
Abstract Carbon-doped copper oxide (CuO)1 -x C x (x = 0, 0.05 and 0.1) samples were synthesized by solid state reaction method, and sintered at 850 °C for 12 h. An X-ray diffraction (XRD) result shows that the structure of the samples was monoclinic. Dielectric studies were carried for these samples in the temperature range 80 K − 300 K between the frequency range 20 Hz − 1 MHz via impedance analyzer. The permittivity and tangent loss values of the doped samples increase with increasing doping concentration. In AC conductivity study, the conductivity mechanism of the 0% and 10% carbon doped samples follows correlated barrier hopping (CBH) model and 5% carbon doped sample follows quantum mechanical tunnelling (QMT) model. The temperature-dependent conductivity curve seems to obey the Arrhenius behavior. The activation energy values have been calculated from the frequency-dependent conductivity curves. The cole–cole plot shows the formation of grain and grain boundary in the samples.
期刊介绍:
Ferroelectrics Letters is a separately published section of the international journal Ferroelectrics. Both sections publish theoretical, experimental and applied papers on ferroelectrics and related materials, including ferroelastics, ferroelectric ferromagnetics, electrooptics, piezoelectrics, pyroelectrics, nonlinear dielectrics, polymers and liquid crystals.
Ferroelectrics Letters permits the rapid publication of important, quality, short original papers on the theory, synthesis, properties and applications of ferroelectrics and related materials.