Actinium(III) oxide

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Actinium(III) oxide
Actinium sesquioxide.jpg
CAS number 12002-61-8 N
Jmol-3D images Image 1
Molecular formula Ac2O3
Molar mass 502.05 g mol−1
Appearance white
Crystal structure Trigonal, hP5
Space group P-3m1, No. 164
Related compounds
Other cations Scandium(III) oxide
Yttrium(III) oxide
Lanthanum(III) oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Actinium(III) oxide is a chemical compound containing the rare radioactive element actinium. It has the formula Ac2O3. It is similar to its corresponding lanthanum compound, lanthanum(III) oxide, and contains actinium in the oxidation state +3.[1][2] Actinium oxide is not to be confused with Ac2O (acetic anhydride), where Ac is an abbreviation for acetyl instead of the symbol of the element actinium.


  1. ^ Actinium, Great Soviet Encyclopedia (in Russian)
  2. ^ Sherman, Fried; Hagemann, French; Zachariasen, W. H. (1950). "The Preparation and Identification of Some Pure Actinium Compounds". Journal of the American Chemical Society 72 (2): 771–775. doi:10.1021/ja01158a034.