Einsteinium(III) oxide

Einsteinium(III) oxide

__ Es 3+     __ O 2−
Names
IUPAC names Einsteinium sesquioxide Dieinsteinium trioxide Einsteinium(III) oxide
Identifiers
CAS Number	37362-94-0
3D model (JSmol)	Interactive image
ChemSpider	154325 deprecated
PubChem CID	177221  charge imbalance
InChI InChI=1S/2Es.3O/q2*+3;3*-2 Key: DMBKIFBGDPVPRA-UHFFFAOYSA-N
SMILES [Es+3].[Es+3].[O-2].[O-2].[O-2]
Properties
Chemical formula	Es2O3
Molar mass	554 g/mol (253Es)
Appearance	colourless solid [1]
Structure
Crystal structure	Hexagonal
Space group	Ia3
Lattice constant	a = 370 pm, c = 600 pm [2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Einsteinium(III) oxide is an oxide of the synthetic actinide einsteinium which has the molecular formula Es₂O₃. It is a colourless solid. ^[1]

Three modifications are known. The body-centered cubic form has lattice parameter a = 1076.6 ± 0.6  pm; this allows the ionic radius of the Es³⁺ ion to be calculated as 92.8 pm. ^[3] The other two forms are monoclinic and hexagonal: the hexagonal form has the lanthanum(III) oxide structure. ^[4]

Einsteinium(III) oxide can be obtained by annealing einsteinium(III) nitrate in sub-microgram quantities. ^[3]

References

1. Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102nd Edition, de Gruyter, Berlin 2007, ISBN   978-3-11-017770-1, p. 1972.
2. Christine Guéneau; Alain Chartier; Paul Fossati; Laurent Van Brutzel; Philippe Martin (2020). "Thermodynamic and Thermophysical Properties of the Actinide Oxides". Comprehensive Nuclear Materials 2nd Ed. 7: 111–154. doi:10.1016/B978-0-12-803581-8.11786-2. ISBN   9780081028667. S2CID   261051636.
3. R. G. Haire, R. D. Baybarz: "Identification and Analysis of Einsteinium Sesquioxide by Electron Diffraction", in: Journal of Inorganic and Nuclear Chemistry , 1973, 35 (2), S. 489–496; doi : 10.1016/0022-1902(73)80561-5.
4. R. G. Haire, L. Eyring, in: Handbook on the Physics and Chemistry of Rare Earths, Vol. 18 Lanthanoids and Actinides Chemistry (hrsg. von K. A. Gscheidner, Jr., L. Eyring, G. R. Choppin, G. H. Lander), North-Holland, New York 1994, S. 414–505.

Further reading

• Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN   978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17.