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Synthesis of carbon-encapsulated magnetic nanoparticles by a grain-boundary-reaction

Published online by Cambridge University Press:  15 February 2011

Qixiang Wang ,
Guoqing Ning ,
Fei Wei  and
Guohua Luo
Qixiang Wang
Affiliation:
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Guoqing Ning
Affiliation:
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Fei Wei
Affiliation:
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Guohua Luo
Affiliation:
Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
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Abstract

Carbon-encapsulated ferric magnetic nanoparticles were prepared by the grain-boundary-reaction of ultrafine goethite particles. The mechanism of the grain-boundary-reaction was studied with high-resolution transmission electronic microscope, X-ray diffraction and thermo gravimetric analysis. The magnetic properties are measured with a vibrating sample magnetometer. The diameter of carbon-encapsulated ferric magnetic nanoparticles is 30~60 nm, and the coercive force and saturate magnetization are 315 Oe and 30 emu /(g powder), respectively. These composite particles are very stable in air.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 776: Symposium Q – Unconventional Approaches to Nanostructures with Applications in Electronics, Photonics, Information Storage and Sensing , 2003 , Q5.14
Copyright
Copyright © Materials Research Society 2003

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