 | |
| Names | |
|---|---|
| Other names Americium sesquioxide | |
| Identifiers | |
3D model (JSmol) | |
| |
| |
| Properties | |
| Am2O3 | |
| Molar mass | 534 g·mol−1 |
| Density | 11.77 |
| Melting point | 2,205 °C (4,001 °F; 2,478 K) |
| Structure | |
| Trigonal,hP5 | |
| P3m1, No. 164 | |
a = 381.7 pm,c = 597.1 pm[1] | |
| Related compounds | |
Othercations | Curium(III) oxide |
Related compounds | Americium dioxideAmericium(II) oxide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Americium(III) oxide oramericium sesquioxide is anoxide of the elementamericium. It has the empirical formulaAm2O3. Since allisotopes of americium are only artificially produced, americium (III) oxide has no natural occurrence. The colour depends on the crystal structure, of which there are more than one. It is soluble in acids.[2]
Americium(III) oxide can be made by heatingamericium dioxide in hydrogen at 600°C.[3]
The hexagonal form is coloured tan, and the cubic form is coloured red-brown the same aspersimmon.[3] The cubic form converts to the hexagonal form on heating to 800°C.[3] The cubic form isnon-stoichiometric with variable oxygen composition. It darkens with increasing oxygen.[3]