Tin selenide

Tin selenide
Names
	Other names Tin(II) selenide
Identifiers
CAS Number	1315-06-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	4937309;
ECHA InfoCard	100.013.871
EC Number	215-257-6;
PubChem CID	6432049;
UNII	M1PQ79637Y ;
	InChI InChI=1S/Se.Sn Key: MFIWAIVSOUGHLI-UHFFFAOYSA-N; InChI=1S/Se.Sn;
	SMILES [Se]=[Sn];
Properties
Chemical formula	SnSe
Molar mass	197.67 g/mol
Appearance	steel gray odorless powder
Density	5.75 g/cm3
Melting point	861 °C (1,582 °F; 1,134 K)
Solubility in water	negligible
Band gap	0.9 eV (indirect), 1.3 eV (direct)
Structure
Crystal structure	Orthorhombic, oP8
Space group	Pnma, No. 62
Lattice constant	a = 4.4 Å, b = 4.2 Å, c = 11.5 Å
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−88.7 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	2 1 1
Safety data sheet (SDS)	https://www.ltschem.com/msds/SnSe.pdf
Related compounds
Other anions	Tin(II) oxide; Tin(II) sulfide; Tin telluride
Other cations	Carbon monoselenide; Silicon monoselenide; Germanium selenide; Lead selenide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Tin selenide, also known as stannous selenide, is an inorganic compound with the formula Sn Se. Tin(II) selenide is a narrow band-gap (IV-VI) semiconductor structurally analogous to black phosphorus. It has received considerable interest for possible applications including low-cost photovoltaics, and memory-switching devices. Because of its low thermal conductivity as well as reasonable electrical conductivity, tin selenide is one of the most efficient thermoelectric materials.