Praseodymium arsenide

Praseodymium arsenide is a binary inorganic compound of praseodymium and arsenic with the formula PrAs.

Preparation
Praseodymium arsenide can be prepared by heating praseodymium and arsenic:


 * $$\mathsf{ Pr + As \ \xrightarrow{T}\ PrAs }$$

Physical properties
Praseodymium arsenide forms cubic crystals, space group F m3m, cell parameters a = 0.6009 nm, Z = 4, and structure like sodium chloride. When heated, it decomposes into arsenic and Pr4As3. At a pressure of 27 GPa, a phase transition to the tetragonal crystal system occurs.