Process for the production of lead metal niobates
AssigneeH. C. Starck GmbH
InventorsKarlheinz Reichert, Harald Kroger
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Abstract
Process for the production of phase-pure highly reactive lead metal niobates of perovskite structure corresponding to the general formula Pb.sub.3 Me(II)Nb.sub.2 O.sub.9 or Pb.sub.2 Me(III)NbO.sub.6, where Me.dbd.Mg, Fe, Co, Ni, Cr, Mn, Cd, Cu and/or Zn, in which perovskite intermediates are formed from corresponding salt solutions, separated off, dried and calcined at temperatures of 500 to 1000.degree. C.
Claims8
A process for the production of phase-pure highly reactive lead metal niobates of perovskite structure corresponding to the general formula Pb.sub.3 Me(II)Nb.sub.2 O.sub.9 or Pb.sub.2 Me(III)NbO.sub.6, where Me.dbd.Mg, Fe, Co, Ni, Cr, Mn, Cd, Cu and/or Zn, in which a perovskite intermediate is obtained from a corresponding salt solution of Pb, Nb, and Me separated off, dried and calcined at temperatures of 500.degree. to 1000.degree. C., characterized in that said salt solution is in the form of citrates and is reacted with ammonia to effect formation of the perovskite intermediate, the phase-pure highly reactive lead metal niobates so produced having less than 5% pyrochlore content.
Dependencies are inferred from the claim text.