619682.fig.002a
(a) Pristine
619682.fig.002b
(b) 1 day
619682.fig.002c
(c) 3 days
619682.fig.002d
(d) 5 days
619682.fig.002e
(e) 9 days
619682.fig.002f
(f) 14 days
Figure 2: FESEM images of pristine Nb foil (a) and Nb foils heated in liquid Ga for 1 day (b), 3 days (c), 5 days (d), 9 days (e), and 14 days (f).