First-principles approach to dielectric response of graded spherical particles
First-principles approach to dielectric response of graded spherical particles
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DOI：
10.1103/physrevb.67.224205
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发表时间：
2003-01
影响因子：
3.7
通讯作者：
L. Dong;G. Gu;K. Yu
中科院分区：
文献类型：
--
作者：
L. Dong;G. Gu;K. Yu
我们研究了球形颗粒复合材料的有效响应，每个颗粒具有沿着颗粒半径变化的介电分布。我们开发了第一性原理方法来计算单个球形粒子的偶极矩，从而计算稀悬浮液的有效介电响应。该方法已被应用到两个模型的介电剖面，其中精确的解决方案是可用的。此外，我们使用的确切结果来验证的结果从微分有效偶极子近似，最近开发的任意介电剖面的梯度球形颗粒治疗。这两种方法之间取得了很好的协议。虽然这项工作的重点是介电响应，该方法同样适用于类似的系统，如电导率和弹性问题。
We have studied the effective response of composites of spherical particles each having a dielectric profile which varies along the radius of the particles. We developed a first-principles approach to compute the dipole moment of the individual spherical particle and hence the effective dielectric response of a dilute suspension. The approach has been applied to two model dielectric profiles, for which exact solutions are available. Moreover, we used the exact results to validate the results from the differential effective dipole approximation, recently developed to treat graded spherical particles of an arbitrary dielectric profile. Excellent agreement between the two approaches were obtained. While the focus of this work has been on dielectric responses, the approach is equally applicable to analogous systems such as the conductivity and elastic problems.