MIXED METAL OXIDE POWDER, ESPECIALLY ANTIMONY-TIN MIXED OXIDE POWDER, AND PREPARATION THEREOF

摘要

Process for preparing a mixed metal oxide powder, comprising the introducing of an aerosol into a flame, the cooling of the hot gases and of the solid product and the removing of the mixed metal oxide powder, wherein the starting compounds present in the solution are metal carboxylates of C1-C5-carboxylic acids, the solution comprises one or more C1-C5-carboxylic anhydrides and the sum of the proportions of metal carboxylates in the solution, based in each case on the metal, is at least 20% by weight. Antimony-tin mixed oxide powder which - has an Sn/Sb weight ratio of 90:10 to 98:2 and a BET surface area of 40 to 90 m2/g, is present in the form of aggregated primary particles which have a very substantially homogeneous distribution of antimony and tin at the molecular level, and has - a d50 of less than 150 nm, a d90 of less than 200 nm, a charge carrier density NL of at least 2.2 x 1018 cm-3 and a minimum specific resistivity of less than 200 ohm x cm. Dispersion thereof.