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Material/Specimen
- Erbium oxide7
- Iron tungstate7
- Manganese tungstate7
- Tantalum(V) oxide7
- Tungsten(IV) oxide7
- Tungsten(VI) oxide7
- Ytterbium oxide7
- Iridium(IV) oxide6
- Lead(II) oxide6
- Lead(II, IV) oxide6
- Lead(IV) oxide6
- Platinum(IV) oxide6
- Platinum(IV) oxide, hydrous6
- Barium iron oxide, barium ferrite5
- Lanthanum-iron oxide5
- Lithium nickel manganese cobalt oxide5
- Barium hafnium oxide4
- Barium(II) oxide4
- Cerium(IV) oxide4
- Europium oxide4