Surface Morphologies of Magnesium Vanadium Oxide, Mg _2‐x V _1+x O ₄

The microscopic appearance of the particle surfaces of magnesium vanadium oxide, Mg _2‐x V _1+x O ₄ , loose powders prepared in various atmospheres at 1200°C was studied. The surface morphology, observed by SEM, was dependent on the V ⁴⁺ content, and three typical features were distinguished at the following x values: 0.75≤ x <1.00; rounded crystals with smooth surfaces 0.55≤ x ≤0.75; edged crystals with stepped surfaces x ≤0.55; coarse crystals with rough surfaces