College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, P.R, China.
School of Materials Sciences and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.
ACS Appl Mater Interfaces. 2016 Mar;8(10):6529-38. doi: 10.1021/acsami.5b12662. Epub 2016 Mar 3.
Among all polarizations, the interface polarization effect is the most effective, especially at high frequency. The design of various ferrite/iron interfaces can significantly enhance the materials' dielectric loss ability at high frequency. This paper presents a simple method to generate ferrite/iron interfaces to enhance the microwave attenuation at high frequency. The ferrites were coated onto carbonyl iron and could be varied to ZnFe2O4, CoFe2O4, Fe3O4, and NiFe2O4. Due to the ferrite/iron interface inducing a stronger dielectric loss effect, all of these materials achieved broad effective frequency width at a coating layer as thin as 1.5 mm. In particular, an effective frequency width of 6.2 GHz could be gained from the Fe@NiFe2O4 composite.
在所有的极化中，界面极化效应最为显著，尤其是在高频下。通过设计各种铁氧体/铁界面，可以显著提高材料在高频下的介电损耗能力。本文提出了一种简单的方法来生成铁氧体/铁界面，以增强高频下的微波衰减。将铁氧体涂覆在羰基铁上，并可以改变为 ZnFe2O4、CoFe2O4、Fe3O4 和 NiFe2O4。由于铁氧体/铁界面引起更强的介电损耗效应，所有这些材料在涂层厚度仅为 1.5 毫米的情况下实现了更宽的有效频宽。特别是，Fe@NiFe2O4 复合材料可以获得 6.2GHz 的有效频宽。
