Carbidearsenides

Carbidearsenides are a class of compounds that combine carbide components with arsenide components within a single crystal lattice. In these materials, carbon atoms form frameworks or occupy interstitial sites in a metal or metalloid lattice that also contains arsenic, creating a mixed carbon-arsenide environment. They are typically ternary or quaternary intermetallics and can include transition metals, lanthanides, or alkaline earth elements as the framework.

Crystal structures of carbidearsenides vary widely and may resemble known carbide or arsenide structures, with carbon and arsenic occupying distinct, ordered, or disordered sites. Bonding character ranges from metallic to covalent, depending on composition and structure, giving rise to a mix of electrical conductivity and semiconducting behavior in different members.

Synthesis usually involves high-temperature solid-state reactions from elemental powders or pre-formed binary carbide and arsenide precursors, sometimes under inert or reducing conditions, and can require high pressures for certain compositions. Some carbidearsenides occur as natural minerals or as metastable phases produced in specialized synthesis routes.

Properties of carbidearsenides are often governed by the robust carbon-arsenide lattice, contributing to high thermal stability and hardness in many members, along with variable electrical and magnetic properties. Because they are relatively niche, research on carbidearsenides often focuses on exploring structure–property relationships and potential applications in hard materials, thermoelectrics, or electronic materials.