title: Microwave absorption properties of core double-shell FeCo/C/BaTiO₃ nanocomposites.
abstract: Microwave absorption properties of core double-shell FeCo/C/(x)BaTiO₃ nanocomposites were investigated in the 1-18 GHz frequency range. High resolution transmission electron microscopy studies reveal the core double-shell type nanocomposite with FeCo nanoparticles as the center, while carbon and BaTiO₃ are the inside and the outside shells, respectively. Enhanced relative permittivity made the core double-shell FeCo/C/(x)BaTiO₃ nanocomposites with better electromagnetic impedance matching than that of a FeCo/C and BaTiO₃ mixture. Reflection loss (RL) values of FeCo/C/(20 wt%)BaTiO₃-paraffin composite are almost double those of the FeCo/C-paraffin composite at the absorbent thickness from 2 to 7.5 mm due to enhanced interfacial effects. The RL value of the FeCo/C/(20 wt%)BaTiO₃-paraffin composite is -41.7 dB at 11.3 GHz at the absorbent thickness of 2 mm and a broad absorption bandwidth of 5.1 GHz (RL values exceeding -10 dB) covers the 9.4-14.5 GHz frequency range.
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research and International Center for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China. dali@imr.ac.cn.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Jiang
authors.forename: Da
authors.initials: D
authors.lastname: Li
authors.forename: Dianyu
authors.initials: D
authors.lastname: Geng
authors.forename: Jing
authors.initials: J
authors.lastname: An
authors.forename: Jun
authors.initials: J
authors.lastname: He
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D002244:Carbon / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry
chemical_list: D003035:Cobalt; D002244:Carbon; D014025:Titanium; D007501:Iron