Sodium arsenide

Sodium arsenide

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Identifiers
CAS Number	12044-25-6
Properties
Chemical formula	Na3As
Molar mass	143,89 g·mol−1
Appearance	violet brown solid
Density	2,36 g·cm−3
Solubility in water	hydrolysis
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Sodium arsenide is the inorganic compound with the formula Na₃As. It is a dark colored solid that degrades upon contact with water or air. It is prepared by the reaction of the elements at 200-400 °C. The compound is mainly of interest as exhibiting a archetypal structure. The normal pressure "sodium arsenide" phase is adopted by many alkali metal pnictides. At 3.6 gigapascals, Na₃As adopts the Li₃Bi structure, which is another archetypal structure.

File:Li3BiMotif.tif

At high pressures, Na₃As adopts this cubic structure (the so-called Li₃Bi motif).