Cerium(III) bromide
| Cerium(III) bromide | |
|---|---|
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| IUPAC name Cerium(III) bromide | |
| Other names Cerous bromide | |
| Identifiers | |
| CAS number | 14457-87-5  |
| PubChem | 292780 |
| ChemSpider | 76185 |
| UNII | GEM75FEL39 |
| Jmol-3D images | {{#if:[Ce+3].[Br-].[Br-].[Br-]|Image 1 |
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| Properties | |
| Molecular formula | CeBr3 |
| Molar mass | 379.828 g/mol |
| Appearance | grey to white solid, hygroscopic |
| Density | 5.1 g/cm3, solid |
| Melting point | 722 °C |
| Boiling point | 1457 °C |
| Solubility in water | Not Published Yet |
| Structure | |
| Crystal structure | hexagonal (UCl3 type), hP8 |
| Space group | P63/m, No. 176 |
| Coordination geometry |
Tricapped trigonal prismatic (nine-coordinate) |
| Hazards | |
| EU classification | not listed |
| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Cerium(III) fluoride Cerium(III) chloride Cerium(III) iodide |
| Other cations | Lanthanum(III) bromide Praseodymium(III) bromide |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
| Infobox references | |
Cerium(III) bromide is an inorganic compound with the formula CeBr3. This white hygroscopic solid is of interest as a component of scintillation counters.
Preparation and basic properties
The compound has been known since at least 1899, when Muthman and Stützel reported its preparation from cerium sulfide and gaseous HBr.[1]Aqueous solutions of CeBr3 can be prepared from the reaction of Ce2(CO3)3·H2O with HBr. The product, CeBr3·H2O can be dehydrated by heating with NH4Br followed by sublimation of residual NH4Br. CeBr3 can be distilled at reduced pressure (~ 0.1 Pa) in a quartz ampoule at 875-880 °C.[2] Like the related salt CeCl3, the bromide absorbs water on exposure to moist air. The compound melts congruently at 722 °C, and well ordered single crystals may be produced using standard crystal growth methods like Bridgman or Czochralski.
CeBr3 adopts the hexagonal, UCl3-type crystal structure with P63/m Space group.[3]
Applications
CeBr3-doped lanthanum bromide single crystals are known to exhibit superior scintillation properties for applications in the security, medical imaging, and geophysics detectors.[4]
Undoped single crystals of CeBr3 have shown promise as a γ-ray scintillation detector in nuclear non-proliferation testing, medical imaging, environmental remediation, and oil exploration.[5]
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References
- ↑ Muthman, W.; Stützel, L.; Chem. Ber. , 1899, 32, 3413-3419
- ↑ Rycerz, L.; Ingier-Stocka,E.; Berkani,M.; Gaune-Escard,M.; J. Chem. Eng. Data 2007, 52, 1209-1212
- ↑ Morosin, B.; J. Chem. Phys. 49, 1968, 3007
- ↑ van Loef, E.V.D.; Dorenbos, P.; van Eijk, C.W.E.; Güdel, H.U.; Krämer,K.W.; App. Phys. Lett. 79, 2001, 1573–1575. Mengea, P.; Gautier, G.; Iltis, A.; Rozsa, C.; Solovyeva, V.; Nucl. Inst. Meth. Phys. Res. A 579 2007 6–10
- ↑ Higgins, W.; Churilov, A.; van Loef, E.; Glodo, J.; Squillante, M.; Shah, K.; J. Crys.Gr. 310 2008 2085–2089.
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