germanium nitride
{{Chembox
| ImageFile = Ge3N4.png
| ImageSize =
| IUPACName = Germanium(IV) nitride
| OtherNames =
|Section1={{Chembox Identifiers
| CASNo = 12065-36-0
| PubChem = 16684757
| ChemSpiderID = 17617086
| SMILES = N#[Ge]N([Ge]#N)[Ge]#N
| InChI = 1/Ge3N4/c4-1-7(2-5)3-6
| InChIKey = BIXHRBFZLLFBFL-UHFFFAOYAE
| StdInChI = 1S/Ge3N4/c4-1-7(2-5)3-6
| StdInChIKey = BIXHRBFZLLFBFL-UHFFFAOYSA-N
}}
|Section2={{Chembox Properties
| Formula = Ge3N4
| MolarMass = 273.947 g/mol
| Appearance = light brown powder
| Density = 5.25 g/cm3
| MeltingPt =
| BoilingPtC = 900
| BoilingPt_notes = (decomposes)
| Solubility =
}}
|Section3={{Chembox Hazards
| MainHazards =
| FlashPt =
| AutoignitionPt =
}}
|Section8={{Chembox Related
| OtherAnions = Germanium phosphide
| OtherCations = Silicon nitride
Gallium nitride
}}
}}
Germanium(IV) nitride is an inorganic compound with the chemical formula Ge3N4. It can be produced through the reaction of germanium and ammonia:{{Greenwood&Earnshaw2nd}}
:3 Ge + 4 NH3 → Ge3N4 + 6 H2
Structure
In its pure state, germanium(IV) nitride is a colorless, inert solid that crystallizes in many polymorphs, of which the most stable is the trigonal β-form (space group P31c). In this structure, the germanium atoms are tetrahedrally coordinated while the nitrogen atoms are trigonal planar.{{Cite journal|last1=Ruddlesden|first1=S. N.|last2=Popper|first2=P.|date=1958|title=On the crystal structure of the nitrides of silicon and germanium|url=http://scripts.iucr.org/cgi-bin/paper?S0365110X58001304|journal=Acta Crystallographica|volume=11|issue=7|pages=465–468|doi=10.1107/S0365110X58001304|doi-access=free}} The γ-form, which forms under high pressure, has a spinel structure.{{Cite journal|last1=McMillan|first1=Paul F.|last2=Deb|first2=Sudip K.|last3=Dong|first3=Jian-Jung|date=2003|title=High-pressure metastable phase transitions in ?-Ge3N4 studied by Raman spectroscopy|journal=Journal of Raman Spectroscopy|language=en|volume=34|issue=7–8|pages=567–577|doi=10.1002/jrs.1007|bibcode=2003JRSp...34..567M|issn=0377-0486}}