A 59Co NMR study to observe the effects of ball milling on small ferromagnetic cobalt particles |
| |
| Authors: | R Speight A Wong P Ellis T Hyde PT Bishop ME Smith |
| |
| Institution: | 1. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK;2. Johnson Matthey Technology Centre, Blounts Court, Sonning Common Reading RG4 9NH, UK |
| |
| Abstract: | To demonstrate the potential of nuclear magnetic resonance (NMR) spectroscopy for investigating detailed structural properties in ferromagnetic materials, three different particle sized cobalt (Co) powders have been ball milled for 24 h are accurately characterised by internal-field 59Co NMR. The 59Co NMR spectra show distinct resonance bands corresponding to the different Co sites, face-centred-cubic (fcc), hexagonal-close-packed (hcp) and stacking faults (sfs), in Co metal powders. The hcp+fcc→hcp phase transition encouraged by ball-milling was observed and quantitative values for each Co environment were obtained. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
