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从经典的单一弛豫时间Debye方程着手,考虑各个弛豫时间的电偶极子对弛豫过程贡献的物理意义后,近似地获得了以任意激活能分布的电偶极子数与等温衰减电流的基本关系,即电偶极子激活能分布密度与电流I和衰减时间t的乘积成正比.数值计算结果检验该理论时表明:无论以分立或连续分布形式存在的电偶极子,精确的与近似的It-logt关系符合得相当好.该理论解决了长期以来电介质中弛豫时间分布非常难得的问题,应用于介电频谱时得到了Hamon早年提出的广泛应用的经验公式的相似结果. 相似文献
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MULTI-ACTIVATION ENERGY DENSITY DISTRIBUTION AND THERMALLY STIMULATED CURRENT OF ELECTRIC DIPOLES IN CONDENSED MATTER
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The physical meaning of the transcendental function in traditional thermally stimulated current (TSC) equation of electric dipoles with a single activation energy was first analyzed. Then a simple formula obtained directly from the tested TSC for calculating activation energy parameter, etc., was deduced. Numerical calculation showed that the exact TSC agrees with the approximated one very well. Further analysis found a limiting condition for the discrete to continuous activation energy density distribution and a criterion for discriminating the contributions to TSC by depolarization of the dipoles with multi-activation energy from those with a single one. 相似文献
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