Holmium(III) selenide
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| Section1 = {{Chembox Identifiers
| CASNo = 12162-60-6
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| ChemSpiderID = 145819
| EC_number = 235-303-9
| PubChem = 166641
| SMILES = [Se-2].[Se-2].[Se-2].[Ho+3].[Ho+3]
| StdInChI=1S/2Ho.3Se/q2*+3;3*-2
| StdInChIKey = XDJRCWPMKKSKGI-UHFFFAOYSA-N
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| Section2 = {{Chembox Properties
| Ho=2 | Se=3
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Holmium(III) selenide is an inorganic compound with the chemical formula Ho2Se3.
Preparation
Holmium(III) selenide can be obtained from the reaction of holmium and selenium (in the presence of iodine):{{cite journal|journal=The Journal of Chemical Thermodynamics|volume=118|language=en|date=March 2018|pages=21–25|doi=10.1016/j.jct.2017.10.013|url=https://linkinghub.elsevier.com/retrieve/pii/S0021961417303804|title=Low-temperature thermodynamic properties of holmium selenide (2:3)|accessdate=2023-06-13|author=M.A. Bespyatov, A.E. Musikhin, V.N. Naumov, L.N. Zelenina, T.P. Chusova, R.E. Nikolaev, N.G. Naumov|url-access=subscription}}
:{{Chem2|2 Ho + 3 Se -> Ho2Se3}}
It can also be prepared by reacting holmium oxide and hydrogen selenide at high temperature.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.
:{{Chem2|Ho2O3 + 3 H2Se -> Ho2Se3 + 3 H2O}}
Properties
Holmium(III) selenide can form orthorhombic AgHoSe2 in the binary system of silver selenide.Julien-Pouzol, M.; Guittard, M. Crystallochemical study of the ternary silver-rare earth-sulfur or selenium compounds situated along the silver chalcogenide-lanthanide(III) chalcogenide binary systems. Annales de Chimie (Paris, France), 1973. 8 (2): 139-145. {{issn|0151-9107}}.