Generation mechanism of negative permittivity and Kramers–Kronig relations in BaTiO3/Y3Fe5O12 multiferroic composites
Generation mechanism of negative permittivity and Kramers–Kronig relations in BaTiO3/Y3Fe5O12 multiferroic composites
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DOI：
10.1088/1361-648x/aa7b5d
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
Zhongyang Wang;Kai Sun;Peitao Xie;Yao Liu;R. Fan
中科院分区：
文献类型：
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作者：
Zhongyang Wang;Kai Sun;Peitao Xie;Yao Liu;R. Fan
近年来，负介电常数和负磁导率等负参数因其独特的电磁特性而引起了人们的广泛关注。通常，负介电常数通过导体-绝缘体复合材料或超材料中的自由电子的等离子体振荡来很好地实现，而在陶瓷中获得负介电常数以减少介电损耗也受到了一些关注。本文报道了钛酸钡和钇铁石榴石复合材料的负介电常数，并用洛伦兹模型进行了很好的拟合。进一步通过Kramers-Kronig关系验证了负介电常数行为，揭示了介电共振导致负介电常数的因果原理仍然成立。讨论了负介电常数、电容-电感转变和交流电导率之间的相互关系。
Recently, negative parameters such as negative permittivity and negative permeability have been attracting extensive attention for their unique electromagnetic properties. Usually, negative permittivity is well achieved by plasma oscillation of free electrons in conductor–insulator composites or metamaterials, while some attention has been paid to attaining negative permittivity in ceramics to reduce dielectric loss. In this paper, negative permittivity in barium titanate and yttrium iron garnet composites are reported which was well fitted by the Lorentz model. Further, negative permittivity behavior was verified via Kramers–Kronig relations, and it revealed that the causal principle still valid for negative permittivity resulted from dielectric resonance. The interrelationships among negative permittivity, capacitive–inductive transition and ac conductivity are discussed.