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Einsteinium(III) oxide : ウィキペディア英語版
Einsteinium(III) oxide

Einsteinium(III) oxide is an oxide of the synthetic actinide einsteinium which has the molecular formula Es2O3. It is a colourless solid.〔
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.〔 The other two forms are monoclinic and hexagonal: the hexagonal form has the lanthanum(III) oxide structure.〔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.〕
Einsteinium(III) oxide can be obtained by annealing einsteinium(III) nitrate in sub-microgram quantities.〔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; .〕
==References==


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