U.S. 8,128,904 B2
BASF Aktiengesellschaft has been awarded a patent for a process for preparing a multi-element oxide composition comprised of an element iron and at least one element different from iron and oxygen in oxidic form, comprised of producing a dry mixture as a precursor composition from sources comprised of sources of the elements of the multi-element oxide composition of which sources comprise as a source for the element iron an aqueous solution of iron nitrate; and thermally treating the precursor composition at an elevated temperature to form a shaped body, either wherein the aqueous solution of iron nitrate is a melt consisting of one or more hydrate of iron nitrate which is in the solid state at a temperature of 25° C and a pressure of 1 bar, or wherein for preparation of the aqueous solution of iron nitrate, a melt consisting of one or more hydrate of iron nitrate which is in the solid state at a temperature of 25° C is produced.