multicomponent metal oxides?

[egonw]

From the article: "Tier 2 includes variants of Tier 1 NMs further modified, such as multicomponent TiO₂_N_SiO₂ (ERM00000693 as powder, ERM00000695 dispersed in solution),"

I think with an axiom we can do this, but I don't think we have this in the ontology yet.