Super High Threshold Percolative Ferroelectric/Ferrimagnetic Composite Ceramics with Outstanding Permittivity and Initial Permeability
Super High Threshold Percolative Ferroelectric/Ferrimagnetic Composite Ceramics with Outstanding Permittivity and Initial Permeability
复制标题
具有出色介电常数和初始磁导率的超高阈值渗流铁电/亚铁磁复合陶瓷
DOI：
10.1002/anie.200904269
复制
发表时间：
2009-01-01
影响因子：
16.6
通讯作者：
Du, Piyi
中科院分区：
文献类型：
--
作者：
Zheng, Hui;Dong, Yanling;Du, Piyi
Ferroelectric/ferromagnetic composites (FFC) have attracted increasing attention because of their ferroelectric and magnetic properties.[1–5] They can be used to produce inductance–capacitance integrated filters,[6, 7] which will reduce the space occupied on circuit boards and promote integration and miniaturization.[8] However, the capacitance (inductance) reduces with reducing the ferroelectric (ferromagnetic) phase fraction according to the compound law. Therefore, it is hard to obtain both high capacitance and high inductance from general FFCs. It is well known that the dielectric properties may be distinctly increased through the percolation effect near the percolation threshold.[8–14] However, the universal percolation threshold is very low (< 0.2). Even though we have prepared a percolative FFC with comparatively high percolation threshold (about 0.5) and high dielectric properties (about 10 times higher than that of the original perovskite phase) by the conventional ceramic method (CCM),[4] the percolation threshold (the content of ferrite phase) was not high enough and the permeability was only 20% of pure magnetic ferrite. Therefore, the content of the ferrite phase should be significantly increased while the ferrite particles are prevented from connecting with each other. These requirements seems very hard to achieve by
