Ca2Fe2O5

Ca2Fe2O5 is a calcium iron oxide compound. It is also known by the mineral name brownmillerite. This material is a member of the perovskite family of compounds, with a distorted crystal structure. The general formula for perovskites is ABX3, and in the case of brownmillerite, calcium and iron occupy the A and B sites, respectively, with oxygen forming the X sites. However, brownmillerite has a specific structure where layers of iron-oxygen octahedra are interleaved with layers containing calcium and iron.

Brownmillerite is known for its magnetic properties, often exhibiting ferrimagnetism. Its color is typically dark brown to black. It can be synthesized through various solid-state reaction methods, typically involving heating mixtures of calcium and iron oxides at high temperatures. Research into Ca2Fe2O5 has explored its potential applications in areas such as catalysis, magnetic materials, and oxygen storage. The exact structural details and properties can vary depending on synthesis conditions and stoichiometry.