Dielectric properties of colossal permittivity materials: An update

C. Cheballah, Z. Valdez-Nava, L. Laudebat, T. Lebey, P. Bidan, S. Diaham, S. Guillemet-Fritsch
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引用次数: 4

Abstract

During the last ten years, a lot of interest has been devoted to the so-called colossal dielectric constant (CDC) material. The first materials exhibiting this behavior were the perovskyte-based ceramics based on the CaCu3Ti4O12 composition (CCTO). Relative dielectric permittivity can attain values up to (or even larger than) 105. Nevertheless, their losses are still high, the lower values ranging 10%, in a narrow frequency range, thus limiting their applications. Most work on this type of materials aims to reduce these losses and widen their useful frequency range. On the other hand, the underlying physical mechanisms responsible of the CDC are still under study. While the analysis of broadband impedance spectroscopy measurements leads most of the authors to propose an interfacial polarization mechanisms (at the electrodes or at internal barriers), there is a limited number of complementary electrical characterization techniques, for the moment, they comfort the proposed interfacial polarization mechanisms. In the present work, several characterization techniques like I-V, Sawyer-Tower (ST) measurements, and time-domain polarization are used to characterize these materials. One of our main results is the observation of a non-symmetrical response of these materials related to the direction of the polarization. These results are observed for both macroscopic level on bulk polycrystalline material and within individual grains of the same samples. These results do not fit current accepted models for polarization for CDC materials.
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巨介电常数材料的介电特性:更新
在过去的十年中,人们对所谓的巨介电常数(CDC)材料产生了浓厚的兴趣。首先表现出这种行为的材料是基于CaCu3Ti4O12成分(CCTO)的钙钛矿基陶瓷。相对介电常数可以达到(甚至大于)105。然而,在较窄的频率范围内,它们的损耗仍然很高,最低值为10%,从而限制了它们的应用。这类材料的大部分工作旨在减少这些损耗并扩大其有效频率范围。另一方面,疾病预防控制中心的基本物理机制仍在研究中。虽然对宽带阻抗谱测量的分析导致大多数作者提出界面极化机制(在电极或内部势垒处),但目前有有限数量的互补电表征技术,它们安慰了所提出的界面极化机制。在目前的工作中,一些表征技术,如I-V,索耶塔(ST)测量和时域极化被用来表征这些材料。我们的主要结果之一是观察到这些材料的非对称响应与极化方向有关。这些结果既可以在宏观水平上观察到块状多晶材料,也可以在同一样品的单个颗粒内观察到。这些结果不符合目前公认的CDC材料极化模型。
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