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Barium azide

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Barium azide
Barium azide.svg
Names
Other names
Barium dinitride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.038.706
EC Number
  • 242-594-6
PubChem CID
UN number 1687
  • InChI=1S/Ba.2N3/c;2*1-3-2/q+2;2*-1 checkY
    Key: UUXFWHMUNNXFHD-UHFFFAOYSA-N checkY
  • [Ba+2].[N-]=[N+]=[N-].[N-]=[N+]=[N-]
Properties
Ba(N3)2
Molar mass 221.37 g/mol
Appearance White crystalline solid
Odor Odourless
Density 2.936 g/cm3
Melting point 126 °C (259 °F; 399 K)
Boiling point 160 °C (320 °F; 433 K) (initial decomposition) >217 °C (deflagrates)
180 °C (initial decomposition), 225 °C explosion
11.5 g/100 mL (0 °C)
14.98 g/100 mL (15.7 °C)
15.36 g/100 mL (20 °C)
22.73 g/100 mL (52.1 °C)
24.75 g/100 mL (70 °C)
Solubility in ethanol 0.017 g/100 mL (16 °C)
Solubility in acetone Insoluble
Solubility in ether Insoluble
Structure
Monoclinic
Hazards
GHS labelling:
GHS01: ExplosiveGHS06: Toxic
Danger
H200, H301, H315, H319, H331, H335
P210, P240, P264, P280, P305+P351+P338, P310
Safety data sheet (SDS) [1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Barium azide is an inorganic azide with the formula Ba(N3)2. It is a barium salt of hydrazoic acid. Like most azides, it is explosive. It is less sensitive to mechanical shock than lead azide.

Preparation

Barium azide may be prepared by reacting sodium azide with a soluble barium salt. Care should be taken to prevent large crystals from forming in the solution as barium azide crystals will explode if subjected to friction/shock or if fully dried. The product should be stored submerged in ethanol.

Uses

Barium azide can be used to make azides of magnesium, sodium, potassium, lithium, rubidium and zinc with their respective sulfates.

Ba(N3)2 + Li2SO4 → 2 LiN3 + BaSO4

It can also be used as a source for high purity nitrogen by heating:

Ba(N3)2 → Ba + 3 N2

This reaction liberates metallic barium, which is used as a getter in vacuum applications.

See also


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