Figure 4

SEM images of Sr2–xCaxNiWO6 (a) x = 0.00, (b) x = 0.02, (c) x = 0.04, (d) x = 0.06 series under 8.0 K magnification and EDX analysis of Sr2–xCaxNiWO6 (e) x = 0.00, (f) x = 0.02, (g) x = 0.04 and (h) x = 0.06.

SEM images of Sr2–xCaxNiWO6 (a) x = 0.00, (b) x = 0.02, (c) x = 0.04, (d) x = 0.06 series under 8.0 K magnification and EDX analysis of Sr2–xCaxNiWO6 (e) x = 0.00, (f) x = 0.02, (g) x = 0.04 and (h) x = 0.06.