| http://www.w3.org/ns/prov#value | - Mo12 Va X1 b X2 c X3 d X4 e X5 f X6 gOn where X1 is W, Nb, Ta, Cr and/or Ce; X2 is Cu, Ni, Co, Fe, Mn and/or Zn; X3 is Sb and/or Bi; X4 is one or more alkali metals; X5 is one or more alkaline earth metals; X6 is Si, Al, Ti and/or Zr; a is from 1 to 6; b is from 0.2 to 4; c is from 0.5 to 18; d is from 0 to 40; e is from 0 to 2; f is from 0 to 4; g is from 0 to 40 and n is a number which is determ
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