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首页> 外文期刊>Journal of Applied Physics >Small Polaron as the Source of the Frequency‐Dependent Conductivity in Glasses Containing Transition Metal Oxides
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Small Polaron as the Source of the Frequency‐Dependent Conductivity in Glasses Containing Transition Metal Oxides

机译:小极化子是含过渡金属氧化物的玻璃中随频率变化电导率的来源

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摘要

Studies of the ac conductivity in glasses containing transition metal oxides show that there are two mechanisms for conduction present in the glasses. That mechanism which is dominant at low temperatures is characterized by almost complete temperature independence, and it is proportional to the frequency, while the mechanism dominant at high temperatures is characterized by an activation energy‐type temperature dependence, and it is independent of the frequency. An explanation of these effects based on a random glass lattice and the identification of the charge carrier as the small polaron is presented. This model leads to a prediction of a time‐dependent carrier concentration for the mechanism dominant at low temperatures. A formula for the conductivity as a function of temperature and frequency, which agrees well with the experimental observations, is derived from this model, using probability arguments. The reason for the good fit is discussed and some of the predictions of the formula are pointed out.
机译:对含过渡金属氧化物的玻璃的交流电导率的研究表明,玻璃中存在两种导电机理。这种在低温下占主导地位的机理的特征在于几乎完全独立于温度,并且与频率成正比;而在高温下占主导地位的机理则以活化能类型的温度依赖性为特征,并且与频率无关。给出了基于随机玻璃晶格的这些效应的解释以及电荷载体作为小极化子的识别。该模型可以预测低温下占主导地位的机理的时间依赖性载流子浓度。该模型使用概率论据推导了电导率随温度和频率变化的公式,该公式与实验观察结果非常吻合。讨论了拟合良好的原因,并指出了该公式的一些预测。

著录项

  • 来源
    《Journal of Applied Physics》 |1969年第10期|共9页
  • 作者

    Schmid A. P.;

  • 作者单位

    Owens‐Illinois Technical Center, Toledo, Ohio 43607;

  • 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
  • 中图分类
  • 关键词

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