prov:value
| - A metal such as aluminum (Al), tungsten (W), niobium (Nb), tantalum (Ta), molybdenum (Mo), chromium (Cr), copper (Cu), gold (Au), silver (Ag), titanium (Ti), nickel (Ni), cobalt (Co), zirconium (Zr), iron (Fe), platinum (Pt) or zinc (Zn); an alloy (for example, MoW) containing therein these metallic elements or a compound (for example, a nitride such as TiN, or a silicide such as WSi2, MoSi2, TiSi
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