This demonstrates that the morphology and agglomeration tendency
of the powder S6 governs the morphology of the wellcrystallized
oxide powder obtained after calcination (Fig. 6c). The
FE-SEM image of higher magnification of Fig. 6d shows that the
particles inside the aggregates of powder S6-800 exhibit rounded,
almost spherical morphology and slightly lower size than those
corresponding to powder S4-800. Thus, an average particle size of
17.21 nm was estimated in this case, which is also in good agree