Barium azide

Barium azide

Names
Other names barium dinitride
Identifiers
CAS Number	18810-58-7
ChemSpider	56472
EC Number	242-594-6
Jmol interactive 3D	Image
PubChem	62728
UN number	1687
InChI InChI=1S/Ba.2N3/c;2*1-3-2/q+2;2*-1 Key: UUXFWHMUNNXFHD-UHFFFAOYSA-N
SMILES [Ba+2].[N-]=[N+]=[N-].[N-]=[N+]=[N-]
Properties
Chemical formula	BaN6
Molar mass	221.37 g/mol
Appearance	white crystalline solid
Odor	odorless
Density	2.936 g/cm[1]
Melting point	126 °C (259 °F; 399 K)
Boiling point	160 °C (320 °F; 433 K) (initial decomposition)[2] >217 °C (deflagrates) 180 °C(initial decomposition),[3] 225 °C explosion
Solubility in water	11.5 g/100 mL (0°C) 14.98 g/100mL (15.7°C) 15.36 g/100mL (20°C) 22.73 g/100mL (52.1°C) 24.75 g/100mL (70°C)[4]
Solubility in alcohol	0.017 g/100 mL[5] (16°C)
Solubility in acetone	insoluble
Solubility in ether	insoluble
Hazards
Safety data sheet
EU classification (DSD)	Highly toxic (T+) Dangerous for the environment (N)
R-phrases	R1, R23, R25, R36, R37, R38
Lethal dose or concentration (LD, LC):
LD50 (Median dose)	mg/kg (oral, rats/mice)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Barium azide Ba(N₃)₂ is an inorganic azide, is explosive, but less sensitive to mechanical shock than lead azide.

Uses

Can be used to make azides of magnesium (but its hydrolytic tendency frustrated efforts to isolate it), sodium, potassium, lithium, rubidium and zinc with their respective sulfates.^[4]

Ba(N₃)₂ + Li₂SO₄ → 2 LiN₃ + BaSO₄

It can also be used in the preparation of extra pure nitrogen on heating:

Ba(N₃)₂ → Ba + 3 N₂

References

1. Fedoroff, Basil T.; Aaronson, Henry A.; Reese, Earl F.; Sheffield, Oliver E.; Clift, George D. (1960). Encyclopedia of Explosives and Related Items (Vol. 1). US Army Research and Development Command TACOM, ARDEC.
2. Tiede, E. (1916). "Die Zersetzung der Alkali- und Erdalkali-azide im Hochvakuum zur Reindarstellung von Stickstoff". Ber. Dtsch. Chem. Ges. 49: 1742–1745. doi:10.1002/cber.19160490234.
3. Audrieth, L. F. (1934). "Hydrazoic Acid and Its Inorganic Derivatives". Chem. Rev. 15: 169–224. doi:10.1021/cr60051a002.
4. H. D. Fair and R. F. Walker (1977). Energetic Materials, Vol. 1. Physics and Chemistry of the Inorganic Azides. New York and London: Plenum Press. doi:10.1002/prac.19770811124.
5. Curtius, T.; Rissom, J. (1898). "Neue Untersuchungen über den Stickstoffwasserstoff N3H". J. Prakt. Chem. 58: 261–309. doi:10.1002/prac.18980580113.