Germanium (II) selenide

Crystal structure
	__ Ge 2+ __ Se 2−
Crystal system	orthorhombic
Space group	Pcmn (No. 62, position 4)
Lattice parameters	a = 4.38 Å , b = 3.82 Å, c = 10.79 Å
General
Surname	Germanium (II) selenide
other names	Germanium monoselenide
Ratio formula	GeSe
Brief description	gray solid
External identifiers / databases
EC number	235-061-4
ECHA InfoCard	100,031,862
PubChem	12049114
Wikidata	Q1279263
properties
Molar mass	151.60 g mol −1
Physical state	firmly
density	5.6 g cm −3 (25 ° C)
Melting point	670 ° C
boiling point	861 ° C
safety instructions
H and P phrases	H: 301-331-373-410
	P: 261-273-301 + 310-311-501
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Germanium (II) selenide is an inorganic chemical compound of germanium from the group of selenides .

Extraction and presentation

Germanium (II) selenide can be obtained by reacting germanium with selenium at 600 to 700 ° C and low pressure.

{\ displaystyle {\ ce {Ge + Se -> GeSe}}}

properties

Germanium (II) selenide is a gray solid with an orthorhombic crystal structure ( space group Pcmn (space group no. 62, position 4) , a = 4.38 Å , b = 3.82 Å, c = 10.79 Å). At low pressure it noticeably evaporates from 520–560 ° C. There is also a high-temperature form from 651 ° C with a cubic crystal structure and the space group Fm 3 m (space group no. 225) . Template: room group / 62.4 Template: room group / 225

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Germanium (II) selenide data sheet , 99.999% from Sigma-Aldrich , accessed on January 26, 2014 ( PDF ).
^ ^A ^b Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 476 ( limited preview in Google Book search).
↑ ^a ^b Georg Brauer (Ed.), With the collaboration of Marianne Baudler u a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 738.
^ A. Okazaki: The crystal structure of germanium selenide GeSe. In: J. Phys. Soc. Yep , 13, 1958, pp. 1151-1155, doi: 10.1143 / JPSJ.13.1151 .

[Sigma-1] ↑ ^a ^b ^c ^d ^e ^f ^g Germanium (II) selenide data sheet , 99.999% from Sigma-Aldrich , accessed on January 26, 2014 ( PDF ).

[Jean_d’Ans,_Ellen_Lax,_Roger_Blachnik-2] A ^b Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 476 ( limited preview in Google Book search).

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

[4] A. Okazaki: The crystal structure of germanium selenide GeSe. In: J. Phys. Soc. Yep , 13, 1958, pp. 1151-1155, doi: 10.1143 / JPSJ.13.1151 .