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Erbium(III) selenide
Identifiers
CAS Number	12020-38-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	4891871;
ECHA InfoCard	100.031.494
EC Number	234-657-1;
PubChem CID	6336878;
	InChI InChI=1S/2Er.3Se Key: SAJINCSOEUABRO-UHFFFAOYSA-N;
	SMILES [Se].[Se].[Se].[Er].[Er];
Properties
Chemical formula	Er2Se3
Molar mass	571.431 g·mol−1
Appearance	green-brown or yellow crystals
Density	6.83 g·cm−3; 6.855 g·cm−3
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Erbium(III) selenide is an inorganic compound with a chemical formula of Er₂Se₃.

Preparation

Erbium(III) selenide can be obtained by the reaction of erbium and selenium:

2 Er + 3 Se → Er₂Se₃

It can also be prepared by reacting erbium oxide and hydrogen selenide at high temperature.^[3]

Er₂O₃ + 3 H₂Se → Er₂Se₃ + 3 H₂O

Properties

Erbium(III) selenide is an orthorhombic crystal with a Sc₂S₃ structure and a space group of Fddd.^[2] It reacts with magnesium selenide at 1000 °C to obtain MgEr₂Se₄.^[4]

References

^ ^a ^b K.-J. Range, Ch. Eglmeier (August 1991). "Crystal data for rare earth sesquiselenides Ln2Se3 (Ln ≡ Ho, Er, Tm, Yb, Lu) and structure refinement of Er2Se3". Journal of the Less Common Metals. 171 (1): L27 – L30. doi:10.1016/0022-5088(91)90254-2. Retrieved 2023-06-13.
^ ^a ^b ^c C.M. Fang, A. Meetsma, G.A. Wiegers (March 1995). "Crystal structure of erbium sesquiselenide, Er2Se3". Journal of Alloys and Compounds. 218 (2): 224–227. doi:10.1016/0925-8388(94)01394-2. Retrieved 2023-06-13.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ Guittard, Micheline; Benacerraf, A.; Flahaut, J. Selenides L₂Se₃ and L₂Se₄ of rare earth elements. Ann. Chim. (Paris), 1964. 9 (1-2): 25-34. CAN61: 38017.
^ D. Reig-i-Plessis, S. V. Geldern, A. A. Aczel, D. Kochkov, B. K. Clark, G. J. MacDougall (2019-04-26). "Deviation from the dipole-ice model in the spinel spin-ice candidate MgEr 2 Se 4". Physical Review B. 99 (13): 134438. arXiv:1703.04267. Bibcode:2019PhRvB..99m4438R. doi:10.1103/PhysRevB.99.134438. ISSN 2469-9950. S2CID 119502480. Retrieved 2023-06-13.{{cite journal}}: CS1 maint: multiple names: authors list (link)