| http://www.w3.org/ns/prov#value | - (i) MR1 xR2 yAz where M is an element selected from the group consisting of Li, Na, K, Rb, Cs, Fr, Be, Mg, Ti, Zr, Hf, Sc, Y, La, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, P, Sb and Bi, preferably Ti, Zr, Hf, Si, Ga, Sn, Co, V, or Cr; R1 is a nitrate; R2 is a ligand selected from the group consisting of hydride,
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