| abstract |
Multimetal oxide compsn. of formula (I) is new (A)p(B)q (I): A = Mo12X<1>aX<2>bX<3>cX<4>dSeX<5>fO<S B>x; B = X<6>gX<7>hOy; X<1> = P, As, B, Ge and/or Si; X<2> = V, Nb and/or W; X<3> = H, up to 97 mole-% of which may be replaced by K, Rb, Cs and/or NH4; X<4> = Sb and/or Bi; X<5> = Re and/or Rh; X<6> = Cu, Fe, Co, Ni, Zn, Cd, Mn, Mg, Ca, Sr and/or Ba; X<7> = Nb, Ta and/or Sb; a = 1-6; b, d = 0-6; c = 3-5; e,f = 0-3; g = 0.5-1.5; h = 2-4; x, y = values depending on the valency and content of elements other than O; p, q = values other than O, with the ratio p/q = 12:0.1 to 12:48. The A and B fractions are each in the form of 30 zones, which differ in chemical compsn. from their local surroundings, and the relative distribution of the A and B zones is as in a mixt. of finely-divided A and finely-divided B. |