(a)
(b)
(c)
Figure 3: Dehydrogenation curves (a), enlarged dehydrogenation curves (b), and enlarged disproportionation curves (c) of Zr0.8Ti0.2Co samples ball milled for different time. (i) 0 h; (ii) 2 h; (iii) 4 h; (iv) 6 h; (v) 8 h.