Germanium nitride

Crystal structure
	__ Ge 4+ __ N 3−
Crystal system	trigonal
Space group	P 31 c (No. 159)
Lattice parameters	a = 8.202 Å , c = 5.941 Å
General
Surname	Germanium nitride
other names	Germanium (IV) nitride
Ratio formula	Ge 3 N 4
Brief description	colorless solid
External identifiers / databases
EC number	235-064-0
ECHA InfoCard	100,031,864
PubChem	16684757
Wikidata	Q4321613
properties
Molar mass	273.95 g mol −1
Physical state	firmly
density	5.35 g cm −3 (25 ° C)
Melting point	> 850 ° C (decomposition)
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319-335
	P: 261-305 + 351 + 338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Germanium nitride (more precisely germanium (IV) nitride) is an inorganic chemical compound of germanium from the group of nitrides .

Extraction and presentation

Germanium nitride can be obtained by reacting germanium with ammonia at 700 ° C.

{\ displaystyle {\ ce {3Ge + 4NH3 -> Ge3N4 + 6H2}}}

It can also be produced by thermal decomposition of germanium (IV) imide Ge (NH) ₂ at over 300 ° C.

properties

Germanium nitride is a colorless, extremely inert solid in its pure state. It does not react with hot mineral acids or alkalis. Hydrogen only reduces the compound to germanium at 700 ° C; it reacts with chlorine at 600 ° C to form germanium (IV) chloride and nitrogen . Several modifications of germanium nitride are known, the trigonal β-form ( space group P 31 c (space group no. 159) , lattice parameter a = 8.202 Å , c = 5.941 Å) being the most stable. The germanium atoms are tetrahedrally surrounded by nitrogen atoms, the nitrogen atoms in a trigonal-planar manner by germanium atoms. The γ-form produced under high pressure has a spinel structure . Template: room group / 159

Individual evidence

↑ ^a ^b ^c ^d ^e ^f data sheet germanium (III) nitride, ≥99.99% trace metals basis at Sigma-Aldrich , accessed on January 27, 2014 ( PDF ).
↑ ^a ^b ^c Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 738.
↑ SN Ruddlesden, P. Popper: On the Crystal Structures of the Nitrides of Silicon and Germanium. In: Acta Crystallographica , 11, 1958, pp. 465-468, doi: 10.1107 / S0365110X58001304 .
↑ Paul F. McMillan, Sudip K. Deb, Jian-Dong Jung: High-pressure metastable phase transitions in β-Ge ₃ N ₄ of studied by Raman spectroscopy. In: Journal of Raman Spectroscopy. 34, 2003, pp. 567-577, doi : 10.1002 / jrs.1007 .

[Sigma-1] ↑ ^a ^b ^c ^d ^e ^f data sheet germanium (III) nitride, ≥99.99% trace metals basis at Sigma-Aldrich , accessed on January 27, 2014 ( PDF ).

[brauer-2] Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 738.

[3] SN Ruddlesden, P. Popper: On the Crystal Structures of the Nitrides of Silicon and Germanium. In: Acta Crystallographica , 11, 1958, pp. 465-468, doi: 10.1107 / S0365110X58001304 .

[DOI10.1002/jrs.1007-4] Paul F. McMillan, Sudip K. Deb, Jian-Dong Jung: High-pressure metastable phase transitions in β-Ge ₃ N ₄ of studied by Raman spectroscopy. In: Journal of Raman Spectroscopy. 34, 2003, pp. 567-577, doi : 10.1002 / jrs.1007 .