Fe3haltig

Fe3haltig is a term used in German-language science to describe substances that contain iron in the +3 oxidation state, i.e., ferric ions (Fe3+). The word functions as an adjective and is commonly applied to both solid materials and dissolved species. It is usually contrasted with Fe2haltig, which denotes the presence of ferrous (Fe2+) iron.

In chemistry and materials science, Fe3+-haltig compounds span a broad range of coordination environments. Ferric ions form complexes with water, hydroxide, carbonate, halide, and organic ligands, and they can hydrolyze in solution to form iron(III) hydroxides or oxyhydroxides depending on pH. Common ferric species include ferric salts such as FeCl3 and Fe(NO3)3, as well as ferric oxides and hydroxides like Fe2O3 and FeOOH. In many applications, the Fe3+ state governs reactivity, color, and magnetic properties of the material.

In geology, soil science, and corrosion science, Fe3+-haltig materials are important because ferric iron often determines color (reddish to yellowish hues), redox behavior, and nutrient availability. Ferric minerals and precipitates play key roles in biogeochemical cycling and in the stability of rust and related corrosion products.

Characterization of Fe3+-haltig substances typically involves UV-Vis spectroscopy to observe ferric ligand-to-metal transitions, Mössbauer spectroscopy for iron oxidation state and local environment, and X-ray diffraction for mineral structure. The term remains widely used in German-speaking literature to emphasize the presence and relevance of Fe3+ in a given system.