Fe4 S8

Fe4S8 is an iron sulfide semiconductor compound, part of the pyrite and marcasite mineral family that exhibits interesting electronic properties at the intersection of metals and semiconductors. This material is primarily of research interest for photovoltaic applications, catalysis, and energy storage systems, where iron sulfides offer potential advantages in cost and earth-abundance compared to conventional semiconductor materials; however, it remains largely experimental rather than established in mainstream industrial production.