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    Einsteinium(III) oxide

    From Wikipedia - Reading time: 7 min
    Einsteinium(III) oxide

    __ Es3+     __ O2−
    Names
    IUPAC names
    Einsteinium sesquioxide
    Dieinsteinium trioxide
    Einsteinium(III) oxide
    Identifiers
    CAS Number
    ChemSpider
    PubChem CID
    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

    [edit]
    1. ^ a b 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. ^ a b 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

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