Uranium diselenide

Uranium diselenide is a compound of uranium and selenium. It has a β form that has orthorhombic crystal system. The family of crystals it matches is PbCl₂. The dimensions of the unit cell are a: 7.455 Å, b: 4.2320 Å, c= 8.964 Å. The compound has the unusual property of ferromagnetism, but only if the temperature is below 14 K.^[1]

Uranium diselenide

Identifiers
CAS Number	12138-21-5
3D model (JSmol)	Interactive image
ChemSpider	74838
ECHA InfoCard	100.032.029
EC Number	235-245-4
PubChem CID	82939
CompTox Dashboard (EPA)	DTXSID7065257
InChI InChI=1S/2Se.U Key: WIQPIQPRLFROPS-UHFFFAOYSA-N
SMILES [Se-2].[Se-2].[U+4]
Properties
Chemical formula	USe2
Molar mass	395.948 g/mol
Appearance	black crystalline solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tellurium can be substituted for selenium in varying quantities, expanding the lattice and increasing the ferromagnetic Curie temperature.^[1]