New model for nearly constant dielectric loss in conductive systems: Temperature and concentration dependencies
New model for nearly constant dielectric loss in conductive systems: Temperature and concentration dependencies
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导电系统中几乎恒定介电损耗的新模型：温度和浓度依赖性
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Macdonald
中科院分区：
文献类型：
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作者：
J. Macdonald
通过适当拟合两种不同离子材料在温度和离子浓度范围内的传导系统频率响应数据，显示了如何完全与离子运动相关的色散和导致几乎恒定的介电损耗（NCL）可以明确区分和分离。后者显然与体材料的极化有关，并且在零移动离子浓度的极限下，NCL似乎接近于零，只产生体介电常数eD∞0，该常数在通常的阻抗光谱实验范围内与频率无关。然而，对于非零离子浓度，介质NCL出现，可以用频率上的小指数恒相元（CPE）复幂律来表示。完整响应的这一部分可以用包含所有体介质色散的CPE来模拟，或者更合理的是，用eD∞0和仅表示与离子之间耦合相关的增量体色散的CPE来模拟。
By appropriate fitting of conductive-system frequency-response data for two different ionic materials over ranges of temperature and ionic concentration, it is shown how dispersion associated entirely with ionic motion and that leading to nearly constant dielectric loss (NCL) can be unambiguously distinguished and separated. The latter is clearly associated with polarization of the bulk material, and in the limit of zero mobile-ion concentration NCL appears to approach zero, yielding only a bulk dielectric constant, eD∞0, one that is frequency-independent over the usual immittance-spectroscopy experimental range. For nonzero ionic concentration, however, dielectric NCL appears and can be represented by a small-exponent constant phase element (CPE) complex power law in frequency. This part of the full response may be modeled either by a CPE that includes all bulk dielectric dispersion or, more plausibly, by eD∞0 and a CPE representing only incremental bulk dispersion associated with coupling between ionic ...