Poverty in the Social World of the Wise

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/68560/2/10.1177_030908928701203704.pd

Crystal growth and the steady-state grain size during high-energy ball-milling

The change in crystal size during high-energy ball-milling of hematite and zinc sulphide powders with initial average crystal size of 8\un{nm} and 4\un{nm}, respectively, has been investigated by X-ray powder diffraction and transmission electron microscopy. It is found that the crystal size increases with ball-milling time. This result shows that the steady-state grain size in ball-milling experiments of bigger particles can be explained by an equilibrium between fracturing and crystal growth. The kinetics of crystal growth during ball-milling of nanoparticles is discussed with reference to a simple empirical model