Iron oxide is a widely used inorganic compound with the following properties and properties: Physical properties: Iron oxide is usually in solid form and comes in different colors, such as red (Fe2O3), yellow (α-Fe2O3), black (Fe3O4), and brown (FeO). They have different crystal structures and lattice parameters. Magnetism: Fe3O4 (magnetic iron ore) in iron oxide shows obvious magnetism and has reversible high-temperature magnetic phase change characteristics. This makes it widely used in fields such as magnetic materials and magnetic recording media. Chemical properties: Iron oxide is a water-insoluble compound with high chemical stability. It is highly resistant to acids and alkalis. Color stability: Iron oxides in different forms generally have good color stability, which makes them widely used in the fields of pigments, colorants and dyes. Optical properties: Iron oxide can absorb and reflect light in the visible light band, which makes it used in the preparation of optical materials, pigments and catalysts. Thermal stability: Iron oxide has high thermal stability and can maintain the stability of its physical and chemical properties in high temperature environments. All in all, iron oxide has a variety of properties and properties that make it widely used in many fields, such as material science, pharmaceutical preparations, environmental protection, etc. The specific application depends on the type and form of iron oxide used.