Calcium arsenide

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 P6$\overline{2}$m. It is isostructural with sodium peroxide and can be expressed as (Ca2+)2(As-As)4−. 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.