Curium(III) oxide
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Curium(III) oxide is a compound composed of curium and oxygen with the chemical formula Cm2O3. It is a crystalline solid with a unit cell that contains two curium atoms and three oxygen atoms. The simplest synthesis equation involves the reaction of curium(III) metal with O2−: 2 Cm3+ + 3 O2− ---> Cm2O3.[1] Curium trioxide can exist as five polymorphic forms.[2][3] Two of the forms exist at extremely high temperatures, making it difficult for experimental studies to be done on the formation of their structures. The three other possible forms which curium sesquioxide can take are the body-centered cubic form, the monoclinic form, and the hexagonal form.[3][4] Curium(III) oxide is either white or light tan in color and, while insoluble in water, is soluble in inorganic and mineral acids.[5][6] Its synthesis was first recognized in 1955.[7]
Names | |
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IUPAC name
Curium(III) oxide | |
Systematic IUPAC name
Curium(3+) oxide | |
Other names
Curic oxide Curium sesquioxide | |
Identifiers | |
3D model (JSmol) |
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PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
Cm2O3 | |
Molar mass | 542 g·mol−1 |
Melting point | 2,265 °C (4,109 °F; 2,538 K) |
Structure | |
Hexagonal, hP5, Body-Centered Cubic, Monoclinic | |
P-3m1, No. 164 | |
Related compounds | |
Other cations |
Gadolinium(III) oxide, Curium hydroxide, Curium trifluoride, Curium Tetrafluoride, Curium Trichloride, Curium Triiodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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