| http://www.w3.org/ns/prov#value | - Examples of metals that may be used include but are not limited to Pd, Co, Au, Ag, Cu, Pt, Ni, Fe, Mn, Cr, V, Ti, Sc, etc and rare earth metals such as Ce, Pr, Nd, Sm, Gd, Hom Er, Yb, etc., and other metals such as Al, Ga, Sn, Pb, In, Mg, Ca, Sr, Na, K, Rb, Cs, etc.
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