Europium monoselenide
{{Chembox
| ImageFile =
| ImageCaption =
| IUPACName =
| OtherNames = Europium selenide, europium(II) selenide, selanylideneeuropium
| Section1 = {{Chembox Identifiers
| CASNo = 12020-66-5
| PubChem = 82810
| ChemSpiderID = 74728
| EINECS = 234-662-9
| DTXSID =
| SMILES = [Eu]=[Se]
| StdInChI= 1S/Eu.Se
| StdInChIKey= GCSIELJPGDPWNK-UHFFFAOYSA-N
}}
| Section2 = {{Chembox Properties
| Eu=1|Se=1
| Appearance = black crystals
| Density = 6.45 g/cm3
| Solubility =
| MeltingPtC = 1213
| BoilingPtC =
| MolarMass = 230.92
}}
| Section3 = {{Chembox Structure
| CrystalStruct = cubic, Fm3m
}}
|Section4={{Chembox Hazards
| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}
| GHSSignalWord = DANGER
| HPhrases = {{H-phrases|301|331|373}}
| PPhrases = {{P-phrases|260|261|301+310|304+340|405|501}}
}}
|Section6={{Chembox Related
| OtherCompounds =
}}
}}
Europium monoselenide is a binary inorganic compound of europium and selenium with the chemical formula EuSe.{{cite web |title=Europium Selenide |url=https://www.americanelements.com/europium-selenide-12020-66-5 |publisher=American Elements |access-date=3 April 2023 |language=en}} The compound forms black crystals.
Synthesis
- Heating stoichiometric amounts of pure substances in a vacuum ampoule at 800 °C:{{cite journal |last1=Klemm |first1=Wilhelm |last2=Senff |first2=Heinz |title=Messungen an zwei- und vierwertigen Verbindungen der seltenen Erden. VIII. Chalkogenide des zweiwertigen Europiums |journal=Zeitschrift für anorganische und allgemeine Chemie |date=5 May 1939 |volume=241 |issue=2–3 |pages=259–263 |doi=10.1002/zaac.19392410212 |url=https://onlinelibrary.wiley.com/doi/10.1002/zaac.19392410212 |access-date=3 April 2023 |language=de |issn=0863-1786|url-access=subscription }}
::{{chem2|Eu + Se -> EuSe}}
- Heating of europium(II) oxalate with an excess of selenium in a hydrogen current:
::{{chem2|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.{{cite journal |last1=McGuire |first1=T. R. |last2=Shafer |first2=M. W. |title=Ferromagnetic Europium Compounds |journal=Journal of Applied Physics |date=1 March 1964 |volume=35 |issue=3 |pages=984–988 |doi=10.1063/1.1713568 |bibcode=1964JAP....35..984M |url=https://aip.scitation.org/doi/10.1063/1.1713568 |access-date=3 April 2023 |issn=0021-8979|url-access=subscription }}{{cite journal |last1=Subhadra |first1=K. G. |last2=Raghavendra Rao |first2=B. |last3=Sirdeshmukh |first3=D. B. |title=X-ray determination of the Debye-Waller factors and Debye temperatures of europium monochalcogenides |journal=Pramana |date=1 June 1992 |volume=38 |issue=6 |pages=681–683 |doi=10.1007/BF02875064 |bibcode=1992Prama..38..681S |s2cid=123290263 |url=https://link.springer.com/article/10.1007/BF02875064 |access-date=3 April 2023 |language=en |issn=0973-7111|url-access=subscription }}
Ferromagnetic at curie temperature 7 K.