Figure 9: Thermal expansion of iron particles of 30 nm size. (a) α-Fe. Signs are relative to aerosol particles; the dilatometric rod length measurements for pure Fe (solid line) and those for Fe with a 1.12% C impurity (dashed line) [45]. (b) γ-Fe. Signs and the dotted line (2) refer to aerosol particles; the dashed line (1) presents the extrapolated data for a massive γ-Fe [46].