Yes, for sure, sol-gel method is among the best ways to get the most homogeneous and the purest oxides ever. Two reasons for this: (1) alkoxides are volatile compounds so they can be purified by distillation up to very high levels; (2) they react in solutions, thereby allowing extremely homogenous mixing, i.e. at the molecular level. About purity however, sol-gel products have to be heated at sufficiently high temperatures for removing the organic moieties possibly remaining in the structure, and also for increasing the density. Sol-gel oxides indeed tend to be porous at the nm scale.

Alain

True. In addition to the previous remark: These metal alkoxides dissolve even better in hydrophobic solvents such as toluene as compared to more hydrofylic solvents such as THF or alcohols.

Solubility of Metal  Alkoxides and  Ayloxides depends on the Alkoxy/Aryloxy Groups. Generally Methoxides and Ethoxides of Homo-, Heterometallic Alkoxdes are Insoluble in Organic Solvents .Accordingly Isopropoxides and Tertiary Butoxides are Soluble.

These are remarkable materials for Functional Requirement of Advanced MAterials.