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首页> 外文期刊>Journal of materials science >Effect of equivalent and aliovalent doping on dielectric properties and relaxation of BaBi_4TiO_(15) ceramics
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Effect of equivalent and aliovalent doping on dielectric properties and relaxation of BaBi_4TiO_(15) ceramics

机译：当量和异价掺杂对BaBi_4TiO_（15）陶瓷介电性能和弛豫的影响

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摘要

The equivalent and aliovalent ions (Zr~(4+), Al~(3+) and Nb~(5+)) doped BaBi_4Ti_4O_(15) ceramics were prepared by a solid-state reaction method. X-ray diffraction patterns showed that the ceramics have a tetragonal structure with space group of I4/mmm at room temperature. The plate-like morphology was observed by scanning electron microscope (SEM) and the anisotropy of grains weakens after doping. The dielectric properties and complex impedance spectra of all samples were studied. The results showed that the dielectric properties demonstrate strong dependence on the type of doping element. Al doping decreases the dielectric constant for limiting the vibration space of Ti ions in small cell volume. Nb doping as a donor induces the formation of Ti~(3+) and the increase of dielectric constant and loss; simultaneously, it decreases the temperature of dielectric constant maximum obviously and the temperature stability of dielectric constant. Doping leads to the increase of diffuseness of phase transition, due to the increasing distribution disorder of cations. Through Arrhenius fitting, the activation energy was estimated to be 0.81-1.18 eV, which could be attributed to the thermal motion of oxygen vacancy and grain distortion.
机译：采用固相反应法制备了BaBi_4Ti_4O_（15）陶瓷中的Zr〜（4 +），Al〜（3+）和Nb〜（5+）等价离子和铝价离子。 X射线衍射图表明，陶瓷在室温下具有四方结构，其空间群为I4 / mm2。通过扫描电子显微镜（SEM）观察到板状形态，并且掺杂后晶粒的各向异性变弱。研究了所有样品的介电性能和复阻抗谱。结果表明，介电性能表现出对掺杂元素类型的强烈依赖性。 Al掺杂降低了介电常数，从而限制了小电池体积中Ti离子的振动空间。 Nb作为供体掺杂会诱导Ti〜（3+）的形成以及介电常数和损耗的增加。同时，它显着降低了介电常数最大值的温度和介电常数的温度稳定性。由于阳离子的分布无序性增加，掺杂导致相变扩散的增加​​。通过Arrhenius拟合，活化能估计为0.81-1.18 eV，这可能归因于氧空位的热运动和晶粒变形。

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  • 来源
    《Journal of materials science》 |2016年第3期|2789-2794|共6页
  • 作者

    Chunli Diao; Hui Li; Zeng Chen; Haiwu Zheng;

  • 作者单位

    Department of Physics, Henan University, Kaifeng 475004, China;

    School of Mechanical and Automotive Engineering, Kaifeng University, Kaifeng 475004, China;

    Department of Physics, Henan University, Kaifeng 475004, China;

    Department of Physics, Henan University, Kaifeng 475004, China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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