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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Comments on the compensation effect observed in thermally stimulated depolarization current analysis
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Comments on the compensation effect observed in thermally stimulated depolarization current analysis

机译:关于热激励去极化电流分析中观察到的补偿效应的评论

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摘要

Compensation has been reported for the relaxation parameters (the activation energy Wand the pre-exponential factor tau(0)) determined by using the thermal sampling (TS) technique. For the peaks obtained by the thermally stimulated depolarization current (TSDC) measurement, there is a relationship between W, tau(0) and the temperature of maximum intensity of the peak T-m that can be employed to deduce a general relationship between W T-m, the compensation temperature T-c and the compensation time tau(c). This relationship can be used for a basic analysis of the compensation effect. By numerical simulations, and using parameters similar to those reported for concrete measurements, we show that it is possible to observe a compensation point only if the activation energy is a monotonically increasing power function of temperature of power coefficient between I and 2, more precisely, if W increases with temperature stronger than linearly but weaker than quadratically. The actual values of the compensation parameters are determined by the relationship between the activation energy and the temperature. The experimental uncertainties affecting the compensation temperature and the compensation time are significant, and consequently, it is not possible to have a precisely defined compensation point. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 34]
机译:已经报告了通过使用热采样(TS)技术确定的松弛参数(活化能W和指数前因子tau(0))的补偿。对于通过热激发去极化电流(TSDC)测量获得的峰,W,tau(0)与峰Tm的最大强度温度之间存在关系,可用于推导W Tm,补偿温度Tc和补偿时间tau(c)。该关系可以用于补偿效果的基本分析。通过数值模拟,并使用与为具体测量报告的参数相似的参数,我们表明只有在激活能量为I和2之间的功率系数温度的单调递增功率函数时,才可能观察到补偿点,如果W随着温度的增加而强于线性,但弱于平方。补偿参数的实际值由活化能和温度之间的关系确定。影响补偿温度和补偿时间的实验不确定性很大,因此不可能精确定义补偿点。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:34]

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