Fe2 I6 O18

Fe₂I₆O₁₈ is an iron iodide oxide compound belonging to the mixed-valence transition metal oxide family, representing a research-phase material rather than an established engineering grade. This compound combines iron, iodine, and oxygen in a layered or framework structure that places it at the intersection of semiconductor and ionic conductor chemistry, with potential relevance to energy storage, photocatalysis, and solid-state ionics applications. While not yet commercialized for mainstream engineering use, iron-iodine-oxygen systems are of interest in emerging fields such as perovskite-related semiconductors and electrochemical devices where multivalent metal chemistry and mixed anionic systems offer tunable electronic and ionic properties.