title: Microwave absorption properties of Ni/(C, silicides) nanocapsules.
abstract: The microwave absorption properties of Ni/(C, silicides) nanocapsules prepared by an arc discharge method have been studied. The composition and the microstructure of the Ni/(C, silicides) nanocapsules were determined by means of X-ray diffraction, X-ray photoelectric spectroscopy, and transmission electron microscope observations. Silicides, in the forms of SiOx and SiC, mainly exist in the shells of the nanocapsules and result in a large amount of defects at the 'core/shell' interfaces as well as in the shells. The complex permittivity and microwave absorption properties of the Ni/(C, silicides) nanocapsules are improved by the doped silicides. Compared with those of Ni/C nanocapsules, the positions of maximum absorption peaks of the Ni/(C, silicides) nanocapsules exhibit large red shifts. An electric dipole model is proposed to explain this red shift phenomenon.
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, People's Republic of China. dali@imr.ac.cn.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Jiang
authors.forename: Han
authors.initials: H
authors.lastname: Wang
authors.forename: Huaihong
authors.initials: H
authors.lastname: Guo
authors.forename: Teng
authors.initials: T
authors.lastname: Yang
authors.forename: Wen-Shu
authors.initials: WS
authors.lastname: Tang
authors.forename: Da
authors.initials: D
authors.lastname: Li
authors.forename: Song
authors.initials: S
authors.lastname: Ma
authors.forename: Dianyu
authors.initials: D
authors.lastname: Geng
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Zhang