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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Electrical and dielectric relaxation in silica glasses at low temperature
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Electrical and dielectric relaxation in silica glasses at low temperature

机译：低温下石英玻璃的电和介电弛豫

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摘要

Electrical and dielectric relaxation were studied for 5 types of silica glasses. Measurements were carried out mainly by the de charging-discharging method under a metal blocking electrode. The effect of sample thickness on relaxation was measured to distinguish bulk conductivity from surface effects and results were compared with ac impedance measurements. It is shown for type III and IV silica glasses that there is an additional relaxation after the conduction relaxation. This relaxation, which termed relaxation II, showed sample thickness dependency, indicating that it originates at the surface of sample. However, type I and type II silica glass did not show relaxation II in the same time range. To explain the different relaxation behavior of various types of silica glasses, a theoretical model for space charge polarization was applied to the present results. It was found that the dielectric and electrical relaxation by space charge polarization are functions of (i) sample thickness, (ii) charge carrier concentration, (iii) charge carrier mobility, and (iv) blocking condition of the electrodes. Space charge polarization theory successfully explains sample thickness dependency and different relaxation behavior of the silica glasses in the present work. Differences in relaxation behavior are due to differences in material parameters that are controlling the space charge polarization process.
机译：研究了5种类型的石英玻璃的电弛豫和介电弛豫。主要在金属阻挡电极下通过放电-放电方法进行测量。测量样品厚度对弛豫的影响，以将体电导率与表面效应区分开，并将结果与​​交流阻抗测量结果进行比较。对于III型和IV型石英玻璃，显示出传导弛豫之后还有另外的弛豫。这种松弛，称为松弛II，显示出样品厚度依赖性，表明它起源于样品表面。但是，I型和II型石英玻璃在相同的时间范围内未显示弛豫II。为了解释各种类型的石英玻璃的不同弛豫行为，将空间电荷极化的理论模型应用于当前结果。发现通过空间电荷极化的介电和电弛豫是（i）样品厚度，（ii）电荷载流子浓度，（iii）电荷载流子迁移率和（iv）电极的阻挡条件的函数。空间电荷极化理论成功地解释了本文工作中样品厚度的依赖性以及石英玻璃的不同弛豫行为。弛豫行为的差异是由于控制空间电荷极化过程的材料参数的差异。

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