%0 Journal Article
%T Effective dielectric response of graded composite materials containing anisotropic particles<br>具有各向异性的梯度颗粒复合材料的有效介电响应
%A Sang Zhi-Fang
%A Li Zhen-Ya
%A <br>桑芝芳
%A 李振亚
%J 中国物理 B
%D 2005
%I 
%X The effective dielectric response of granular composites, in which spheroidal particles with graded shells are randomly distributed in a host matrix, is investigated. General expressions for the effective dielectric constant of the composites and partial resonant condition are obtained in the dilute limit by use of a quasi-static approximation. In particular, spheroidal particles with a power-law gradation profile in the shells are studied in detail. We find that, by adjusting the dielectric gradient profile in the shells, the shape and structure of particles, it is possible to enhance the effective dielectric constant of the composite and to realize partial resonance. Under the partial resonant conditions, the coated spheroidal particles with graded shells within the host matrix can be regarded as equivalent homogeneous spheroids embedded in the same host. The equivalent spheroids have the same dielectric constant as the original cores and semiaxes equal to those of the original shells: i.e., the partial resonant system behaves as if the cores of the particles were enlarged and the shells were absent.
%K effective dielectric response
%K partial resonance
%K graded composite materials
%K geometric anisotropy<br>有效介电响应，部分共振，梯度复合材料，几何各向异性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=45506C1B1E1A7F0A3DCDBE31B3CCBA89&yid=2DD7160C83D0ACED&vid=F3583C8E78166B9E&iid=5D311CA918CA9A03&sid=C48302AEE9AFB6AE&eid=27B74BA4EDC40A8D&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=36