Calcium arsenide is an inorganic compound with the chemical formula Ca2As2 and is one of the arsenides of calcium. It is a hexagonal crystal with a space group of P6m. It is isostructural with sodium peroxide and can be expressed as (Ca2+)2(As-As)4−.L'Haridon, Paul; Guyader, Jean; Hamon, Mireille. Refinement of the calcium monoarsenide structure. Revue de Chimie Minerale, 1976. 13 (2): 185-189. . It reacts with sodium monoarsenide and silicon in a tantalum container to obtain Na4Ca2SiAs4. It reacts with potassium arsenide, iron arsenide and calcium fluoride at high temperature to obtain KCa2Fe4As4F2.
References