Magnesium nitride

Crystal structure
	__ N 3− __ Mg 2+
General
Surname	Magnesium nitride
Ratio formula	Mg 3 N 2
Brief description	beige solid
External identifiers / databases
EC number	235-022-1
ECHA InfoCard	100,031,826
PubChem	16212682
Wikidata	Q425036
properties
Molar mass	100.95 g mol −1
Physical state	firmly
density	2.71 g cm −3
Melting point	800 ° C (decomposition)
solubility	reacts with water
safety instructions
H and P phrases	H: 228-315-319-335
	P: 210-280-302 + 352-304 + 340-312-332 + 313-337 + 313
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Magnesium nitride is a chemical compound made up of the elements magnesium and nitrogen . It has the formula Mg ₃ N ₂ and belongs to the group of nitrides .

Extraction and presentation

It is formed as a yellow solid, for example when metallic magnesium is heated to approx. 300 ° C under a nitrogen atmosphere.

{\ displaystyle \ mathrm {3 \ Mg + \ N_ {2} \ longrightarrow \ Mg_ {3} N_ {2}}}

This reaction is strongly exothermic with −462.8 kJ mol ⁻¹ from the solid phase and with −479.6 kJ mol ⁻¹ from the liquid phase.

It can also be produced by reacting magnesium and ammonia .

{\ displaystyle \ mathrm {3 \ Mg + 2 \ NH_ {3} \ longrightarrow Mg_ {3} N_ {2} +3 \ H_ {2}}}

When magnesium metal is burned in air, it is formed alongside magnesium oxide (MgO) and makes it appear yellowish.

properties

Magnesium nitride is a greenish-yellow to yellow-orange colored, loose powder. It has a cubic crystal structure of the carbon sesquioxide type (a = 9.95 Å ). Magnesium nitride hydrolyzes with water to form magnesium hydroxide and ammonia .

{\ displaystyle \ mathrm {Mg_ {3} N_ {2} +6 \ H_ {2} O \ longrightarrow 3 \ Mg (OH) _ {2} +2 \ NH_ {3}}}

In the historical Serpek process , this reaction (in addition to the hydrolysis of AlN) was used to synthesize ammonia (see Haber-Bosch process ).

Individual evidence

↑ ^a ^b ^c ^d data sheet magnesium nitride from AlfaAesar, accessed on December 15, 2010 ( PDF )(JavaScript required) .
↑ ^a ^b Entry on magnesium nitride in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .
↑ ^a ^b ^c Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 911.
↑ Yuan Chunmiao, Yu Lifu, Li Chang, Li Gang, Zhong Shengjun: Thermal analysis of magnesium reactions with nitrogen / oxygen gas mixtures in J. Hazard. Mat. 260 (2013) 707-714, doi : 10.1016 / j.jhazmat.2013.06.047 .

[alfa-1] ta sheet magnesium nitride from AlfaAesar, accessed on December 15, 2010 ( PDF )(JavaScript required) .

[GESTIS-2] Entry on magnesium nitride in the GESTIS substance database of the IFA , accessed on January 8, 2020(JavaScript required) .

[brauer-3] Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 911.

[Chunmiao-4] Yuan Chunmiao, Yu Lifu, Li Chang, Li Gang, Zhong Shengjun: Thermal analysis of magnesium reactions with nitrogen / oxygen gas mixtures in J. Hazard. Mat. 260 (2013) 707-714, doi : 10.1016 / j.jhazmat.2013.06.047 .