Neptunium(III) phosphide

Neptunium(III) phosphide is a binary inorganic compound of neptunium metal and phosphorus with the chemical formula NpP.^[2]

Neptunium phosphide

Identifiers
CAS Number	41996-79-6 Y
3D model (JSmol)	Interactive image
InChI InChI=1S/Np.P Key: AGTDZATXHOWRTO-UHFFFAOYSA-N
SMILES [Np]#P
Properties
Chemical formula	NpP
Molar mass	268 g·mol−1
Appearance	black crystals
Density	10.06 g/cm3[1]
Solubility in water	insoluble
Related compounds
Related compounds	Neptunium(IV) phosphide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Neptunium(III) phosphide can be formed from the fusion of stoichiometric amounts of neptunium and phosphorus at 750 °C:^{[citation needed]}

4 Np + P₄ → 4 NpP

Physical properties

Neptunium(III) phosphide forms black crystals of NaCl-structure.^[3] It is insoluble in water. It is antiferromagnetic below 130 K.^[4][5]