Speight R, Wong A, Ellis P, Hyde T, Bishop P T, Smith M E
Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
Solid State Nucl Magn Reson. 2009 Apr;35(2):67-73. doi: 10.1016/j.ssnmr.2008.12.001. Epub 2008 Dec 16.
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 24h are accurately characterised by internal-field (59)Co NMR. The (59)Co 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.
