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A non-aqueous gel of at least two metal oxides which is a precursor for glassy amorphous or crystalline mixed oxides is produced by reacting an alkoxide of one metal and a halide of another metal producing a low molecular weight polymeric reaction product, heating the reaction product to produce a p

A non-aqueous gel of at least two metal oxides which is a precursor for glassy amorphous or crystalline mixed oxides is produced by reacting an alkoxide of one metal and a halide of another metal producing a low molecular weight polymeric reaction product, heating the reaction product to produce a polymeric product of substantially higher molecular weight, and heating the higher molecular weight polymeric product in air to remove its carbonaceous content.

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A process for producing a solid amorphous precursor gel composed of at least two metal oxides, said solid gel being free of water and hydroxyl groups and having a specific surface area higher than 10 square meters per gram, consisting essentially of reacting under reflux conditions in a substantiall

A process for producing a solid amorphous precursor gel composed of at least two metal oxides, said solid gel being free of water and hydroxyl groups and having a specific surface area higher than 10 square meters per gram, consisting essentially of reacting under reflux conditions in a substantially moisture-free atmosphere a mixture of metal alkoxide and metal halide at a temperature ranging from about room temperature up to about 250°C. at a pressure ranging from atmospheric pressure to superatmospheric pressure ranging up to about 10 atmospheres forming a polymeric reaction product, said metal alkoxide being Mn(OR)n where Mn is metal ion, R is an alkyl radical, and n is the valence of Mn, said metal halide being MeXe where Me is metal ion different from Mn, X is a halide selected from the group consisting of chloride, bromide, iodide and fluoride, and e is the valence of Me, heating said polymeric reaction product in a substantially moisture-free atmosphere at a temperature ranging from about 100°C. up to about 300°C. producing a polymeric product insoluble in ethyl ether at room temperature, pyrolyzing said ether-insoluble polymeric product in air or oxygen at a temperature ranging from about 450°C. to about 600°C. producing said gel comprised of a submicroscopically homogeneous mixture of the oxides of Mn and Me and up to about 0.02% by weight of elemental carbon based on the total weight of said gel. A solid amorphous precursor gel free of water and hydroxyl groups and having a specific surface area higher than 10 square meters per gram, said gel consisting essentially of a submicroscopically homogeneous mixture of at least two metal oxides and up to about 0.02% by weight of elemental carbon based on the total weight of said gel, said gel having interconnecting pores open to the surface. A polycrystalline ceramic body produced by sintering the gel of claim 6 and having a density ranging from about 70% to about 100%. An impermeable glassy submicroscopically homogeneous mixture of oxides of aluminum and silicon corresponding to about 3Al203. 2SiO2 and up to about 0.02% by weight of elemental carbon based on the total weight of said glassy mixture, said glassy mixture being free of water and hydroxyl groups.