Figure 4

The surface of the used crucible materials, scanning electron microscopy (SEM) secondary electron (S.E.) images (a): glass, (b): TEFLON, (c): fine ALOX, (d): rough ALOX, (e): P40, (f): P80, (g): P120, and (h): P150.

The surface of the used crucible materials, scanning electron microscopy (SEM) secondary electron (S.E.) images (a): glass, (b): TEFLON, (c): fine ALOX, (d): rough ALOX, (e): P40, (f): P80, (g): P120, and (h): P150.