Samarium(III) oxide
_oxide.jpg) | |
| Names | |
|---|---|
| Other names
samarium sesquioxide | |
| Identifiers | |
12060-58-1  | |
| 3D model (Jmol) | Interactive image |
| ChemSpider | 140199 |
| ECHA InfoCard | 100.031.845 |
| EC Number | 235-043-6 |
| PubChem | 159425 |
| |
| |
| Properties | |
| Sm2O3 | |
| Molar mass | 348.72 g/mol |
| Appearance | yellow-white crystals |
| Density | 8.347 g/cm3 |
| Melting point | 2,335 °C (4,235 °F; 2,608 K) |
| Boiling point | jeff |
| insoluble | |
| Structure | |
| cubic | |
| Hazards | |
| EU classification (DSD) |
not listed |
| Related compounds | |
| Other anions |
Samarium(III) chloride |
| Other cations |
Promethium(III) oxide, Europium(III) oxide |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is ?) | |
| Infobox references | |
Samarium(III) oxide (Sm2O3) is a chemical compound.
Uses
Samarium(III) oxide is used in optical and infrared absorbing glass to absorb infrared radiation. Also, it is used as a neutron absorber in control rods for nuclear power reactors. The oxide catalyzes dehydration of acyclic primary alcohols to aldehydes and ketones. Another use involves preparation of other samarium salts. [1]
Preparations
Samarium(III) oxide may be prepared by two methods:
1. thermal decomposition of samarium(III) carbonate, hydroxide, nitrate, oxalate or sulfate:
- Sm2(CO3)3 → Sm2O3 + 3 CO2
2. by burning the metal in air or oxygen at a temperature above 150 °C:
- 4 Sm + 3 O2 → 2 Sm2O3
Reactions
Samarium(III) oxide dissolves in mineral acids, forming salts upon evaporation and crystallization:
- Sm2O3 + 6 HCl → 2 SmCl3 + 3 H2O
The oxide can be reduced to metallic samarium by heating with a reducing agent, such as hydrogen or carbon monoxide, at elevated temperatures.
References
- ↑ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8