Microstructural and electromagnetic properties of MnO_2 coated nickel particles with submicron size  

作　　者：唐葆霖 何峻 嵇天浩 王新林 

机构地区：[1]Division of Functional Material Research,Central Iron & Steel Research Institute [2]College of Chemical and Environmental Engineering,Beijing Technology and Business University

出　　处：《Chinese Physics B》2009年第6期2571-2575,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 50671026)

摘　　要：Nickel particles with submicron size are prepared by using the solvothermal method. These spheres are then coated with a layer of MnO2 using the soft chemical method. The microstructure is characterized by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Energy x-ray dispersive spectrometry and high- resolution images show that the granular composites have a classical core/shell structure with an MnO2 superficial layer, no more than 10 nm in thickness. The hysteresis measurements indicate that these submicron-size Ni composite powders have small remanence and moderate coercivity. The electromagnetic properties of the powders measured by a vector network analyzer in a frequency range of 2-18 GHz are also reported in detail.Nickel particles with submicron size are prepared by using the solvothermal method. These spheres are then coated with a layer of MnO2 using the soft chemical method. The microstructure is characterized by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Energy x-ray dispersive spectrometry and high- resolution images show that the granular composites have a classical core/shell structure with an MnO2 superficial layer, no more than 10 nm in thickness. The hysteresis measurements indicate that these submicron-size Ni composite powders have small remanence and moderate coercivity. The electromagnetic properties of the powders measured by a vector network analyzer in a frequency range of 2-18 GHz are also reported in detail.

关 键 词：core/shell microstructure SUBMICRON electromagnetic properties 

分 类 号：TB303[一般工业技术—材料科学与工程]