Plutonium(III) arsenide

Plutonium arsenide is a binary inorganic compound of plutonium and arsenic with the formula PuAs.

Plutonium(III) arsenide

Names
Other names Plutonium monoarsenide
Identifiers
CAS Number	12006-02-9
3D model (JSmol)	Interactive image
PubChem CID	129627908
InChI InChI=1S/As.Pu Key: IFUISAQYPYTWOE-UHFFFAOYSA-N
SMILES [As]#[Pu]
Properties
Chemical formula	AsPu
Molar mass	318,92
Appearance	Black or dark-gray crystals
Density	10.39 g/cm3
Melting point	2,420 °C (4,390 °F; 2,690 K)
Structure
Crystal structure	Cubic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Fusion of stoichiometric amounts of pure substances in a vacuum or helium atmosphere.^[1] The reaction is exothermic:

Pu + As → PuAs

Passing arsine through heated plutonium hydride:

2PuH₂ + 2AsH₃ → 2PuAs + 5H₂

Physical properties

Plutonium arsenide forms black or dark gray crystals of a cubic system,^[2] space group Fm3m, cell parameters a = 0.5855 nm, Z = 4, structure of the NaCl-type.^[3]

At high pressure (about 35 GPa), a phase transition occurs to a structure of the CsCl-type.^[4]

At a temperature of 129 K, PuAs transforms into a ferromagnetic state.^[5]