Microstructural and electromagnetic properties of MnO2 coated nickel particles with submicron size

• 来源期刊: 中国物理B（英文版）
• 关键词: core/shell microstructure submicron electromagnetic properties
• 年，卷（期）: 2009,（6）
• 页码范围: 2571-2575
• 页数: 5页
• 语种: 英文

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.