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Rubidium azide
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Rubidium azide is an inorganic compound with the formula . It is the rubidium salt of the . Like most , it is explosive.


Preparation
Rubidium azide can be created by the reaction between and which results in formation of easily separated insoluble :

In at least one study, rubidium azide was produced by the reaction between , , and rubidium hydroxide in the presence of :

This formula is typically used to synthesize from caustic potash.


Uses
Rubidium azide has been investigated for possible use in alkali vapor cells, which are components of , atomic magnetometers and . Azides are desirable starting materials because they decompose into metal and nitrogen gas when exposed to . According to one publication:
Among the different techniques used to fill microfabricated alkali vapor cell , UV decomposition of rubidium azide () into metallic Rb and nitrogen in coated cells is a very promising approach for low-cost wafer-level fabrication.


Structure
At room temperature, rubidium azide has the same structure as potassium hydrogen fluoride; a distorted structure. At 315 °C and 1 atm, rubidium azide will transition to the normal caesium chloride structure. The II/I transition temperature of rubidium azide is within 2 °C of its melting point.

Rubidium azide has a high pressure structure transition, which occurs at about 4.8 kilobars of pressure at 0 °C. The transition boundary of the II/III transition can be defined by the relationship P = 4.82 + 0.0240\,t, where P is the pressure in kilobars and t is the temperature in degrees .


Reactions
As with all azides, it will decompose and release nitrogen gas when heated or severely shocked:

Discharge rubidium azide in nitrogen gas will produce .H. Wattenberg: "Über zwei Bildungsweisen von Natriumnitrid und Kaliumnitrid" in Ber. d. dt. chem. Ges. 1930, 63(7), S. 1667-1672.


Hazards
At 4.1 kilobars of pressure and about 460 °C, rubidium azide will explosively decompose. Under normal circumstances, it explodes at 395 °C. It also decomposes upon exposure to .

Rubidium azide is very sensitive to mechanical shock, with an impact sensitivity comparable to that of .

Like all azides, rubidium azide is toxic.

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