Europium monoselenide

Europium monoselenide is a binary inorganic compound of europium and selenium with the chemical formula EuSe.^[1] The compound forms black crystals.

Europium monoselenide

Names
Other names Europium selenide, europium(II) selenide, selanylideneeuropium
Identifiers
CAS Number	12020-66-5
3D model (JSmol)	Interactive image
ChemSpider	74728
ECHA InfoCard	100.031.499
EC Number	234-662-9
PubChem CID	82810
CompTox Dashboard (EPA)	DTXSID101014196
InChI InChI=1S/Eu.Se Key: GCSIELJPGDPWNK-UHFFFAOYSA-N
SMILES [Eu]=[Se]
Properties
Chemical formula	EuSe
Molar mass	230.92
Appearance	black crystals
Density	6.45 g/cm3
Melting point	1,213 °C (2,215 °F; 1,486 K)
Structure
Crystal structure	cubic, Fm3m
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373
Precautionary statements	P260, P261, P301+P310, P304+P340, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

• Heating stoichiometric amounts of pure substances in a vacuum ampoule at 800 °C:^[2]

Eu + Se → EuSe

• Heating of europium(II) oxalate with an excess of selenium in a hydrogen current:

EuC₂O₄ + Se + H₂ → EuSe + H₂O + CO₂ + CO

Physical properties

Europium monoselenide forms black (or brown) crystals of cubic syngony, spatial group Fm3m, cell parameters a = 0.6185 nm, Z = 4.^[3][4]

Ferromagnetic at curie temperature 7 K.