The dislocation densities and crystallite size distributions in ball-milled fluorides, MF2 (M = Ca, Sr, Ba and Cd), of the fluorite structure type were determined as a function of milling time by X-ray diffraction line-profile analysis. The treatment was based on the concept of dislocation contrast to explain strain anisotropy by means of the modified Williamson-Hall and Warren-Averbach approaches and a whole-profile fitting method using physically based functions. In most cases, the measured and calculated patterns were in perfect agreement; however, in some specific cases, the first few measured profiles appeared to be narrower than the calculated ones. This discrepancy was interpreted as the result of an interference effect. By taking into account and correcting for this interference effect, the microstructure of ball-milled fluorides was determined in terms of dislocation structure and size distributions of coherent domains. A weak coalescence of the crystallites was observed at longer milling periods. An incubation period in the evolution of micro-strains was in correlation with the homologous temperatures of the fluorides.

Dislocation Densities and Crystallite Size Distributions in Nanocrystalline Ball-Milled Fluorides, MF2 (M = Ca, Sr, Ba, Cd), Determined by X-ray Diffraction Line-Profile Analysis. G.Ribárik, N.Audebrand, H.Palancher, T.Ungár, D.Louër: Journal of Applied Crystallography, 2005, 38[6], 912-26