FeMg

FeMg is a term used to denote a combination or interaction of iron (Fe) and magnesium (Mg) in various scientific contexts. It does not refer to a single, well-defined chemical compound, but rather to systems in which iron and magnesium are present together and influence each other’s behavior in a material or mineral.

In geology and mineralogy, Fe and Mg commonly substitute for one another in crystal lattices, creating solid solutions. A prominent example is the olivine group, represented conceptually by a formula such as (Mg,Fe)2SiO4, where the Mg and Fe contents vary across samples. The Fe/Mg ratio in such minerals helps characterize rock provenance and geological processes, including mantle differentiation and magmatic evolution.

In materials science and metallurgy, there is no widely standardized binary compound with the exact stoichiometry FeMg. Instead, researchers study iron–magnesium systems and related intermetallics or alloys, often with additional elements. These materials can offer combinations of lightness and strength, but magnesium’s high reactivity and tendency to oxidize pose processing and durability challenges. When explored, Fe–Mg alloys or intermetallic phases are typically investigated under controlled conditions (inert atmospheres or protective coatings) and may require specialized fabrication techniques such as arc melting or powder metallurgy. Practical applications remain limited compared to more established iron- or magnesium-based materials, and properties are highly dependent on microstructure and processing.

Overall, FeMg serves as a conceptual shorthand across disciplines for iron–magnesium interactions rather than a single defined compound.