prov:value
| - In addition, as a starting material for D (in which D is a compound containing at least one element selected from the group consisting of V, Nb, Ta, Mo, W, Y, Sc, P, Al and Fe), powdered V2O5, Nb2O5, Ta2O5, MoO3, WO3, Y2O3, Sc2O3, P2O5, Al2O3 and Fe2O3 were prepared.
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