中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 17 Special 1 November 2007 |
Fe/Co particles
（1. Department of Physics, Lanzhou University of Technology, Lanzhou 730050, China;
2. Gansu Key Laboratory of New Nonferrous Metal Materials, Lanzhou University of Science and Technology,
Lanzhou 730050, China）
Abstract:The experimental apparatus by self-designed was used, Fe/Co particles encapsulated in multi-walled carbon nanotubes (MWCNTs) were prepared by the method of anodic arc discharging plasma. The products were characterized by transmission election microscopy, Raman spectroscopy and X-ray diffractometry. The magnetic properties of the products were characterized with vibration sample magnetometer. The TEM results show that MWCNTs have little impurity and good particles size, and Fe/Co with high continuity encapsulaties in carbon nanotubes. The saturated magnetization (σs), remanence (σm) and coercivity (Hc) of the sample are 17.30 A/(m·kg), 3.96 A/(m·kg) and 31 521.60 A/m, showing better ferromagnetism compared with the bulk Fe/Co. The optimal conditions in this case are as follows: a helium gas atmosphere of 6.0×104 Pa, an arc current of 70 A, a voltage drop of 24 V, a constant distance of about 2 mm between the anodes and cathode, metallic powder contents of Fe and Co of 15.0% (mass fraction) and 15.0%, respectively, and well cooled electrodes and collector. This process is a convenient and effective that Fe/Co particles can be encapsulated in MWCNTs.
Key words: multi-walled carbon nanotubes; Fe/Co particles; anodic arc; magnetic properties
