Neptunium silicide

Neptunium silicide is a binary inorganic compound of neptunium and silicon with the chemical formula NpSi
₂.^[1] The compound forms crystals and does not dissolve in water.^[2]

Neptunium silicide

Names
Other names Neptunium disilicide
Identifiers
CAS Number	60862-56-8 Y
3D model (JSmol)	Interactive image
InChI InChI=1S/Np.2Si Key: KBXNGDVSIABQJL-UHFFFAOYSA-N
SMILES [Np].[Si].[Si]
Properties
Chemical formula	NpSi2
Appearance	Crystals
Density	9.03
Solubility in water	insoluble
Related compounds
Related compounds	Plutonium silicide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Heating neptunium trifluoride with powdered silicon in vacuum:^[3]

${\displaystyle {\mathsf {4NpF_{3}+11Si\ \xrightarrow {1500^{o}C} \ 4NpSi_{2}+3SiF_{4}}}}$

Physical properties

Neptunium silicide forms crystals^[4] of tetragonal crystal system, space group I4₁/amd, cell parameters: a = 0.396 nm, c = 1.367 nm, Z = 4.^[5]

Neptunium disilicide does not dissolve in water.

Chemical properties

Neptunium disilicide reacts with HCl:^[3]

NpSi₂ + 8HCl → NpCl₄ + 2SiH₄