865373.fig.004a
(a)
865373.fig.004b
(b)
865373.fig.004c
(c)
865373.fig.004d
(d)
865373.fig.004e
(e)
865373.fig.004f
(f)
Figure 4: Scanning electron micrographs (a, b, and c) of sol-gel products presumably of oxalates after drying at 100°C for 24 h and (d, e, and f) of corresponding oxide powders, formed by decomposition at 600°C for 2 h each in air for Ni/(Ni+Mg) atomic ratio ( ) equal to 0.01, 0.05, and 0.10, respectively.