Figure 7
Variation of UV–vis-NIR spectra from Mg y Cu 2-y V 2 O 7 compositions. UV–vis-NIR spectra of MgyCu2-yV2O7 (0.0 ≤ y ≤ 2.0) samples fired at : (a) 600, (b) 800 and (c) 1000 ºC; y = 0.0 (1), y = 0.50 (2), y = 0.75 (3), y = 1.0 (4), y = 1.25 (5), y = 1.50 (6), y = 1.75 (7) and y = 2.0 (8).