Fig. 6

SEM image and spatial distribution of Ca along lateral head margin. a EDX analysis of the spatial distribution of Ca. b Typical EDX spectrum showing the presence of Ca (0.02–0.04 atomic %)

SEM image and spatial distribution of Ca along lateral head margin. a EDX analysis of the spatial distribution of Ca. b Typical EDX spectrum showing the presence of Ca (0.02–0.04 atomic %)