Cerium(III) bromide

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Cerium(III) bromide
UCl3 without caption.png Cerium bromide (space filling) 2.png
Identifiers
CAS number 14457-87-5 YesY
PubChem 292780
ChemSpider 76185 YesY
UNII GEM75FEL39 YesY
Jmol-3D images Image 1
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
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

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[edit]

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[edit]

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]

Suppliers[edit]

References[edit]

  1. ^ Muthman, W.; Stützel, L.; Chem. Ber. , 1899, 32, 3413-3419
  2. ^ Rycerz, L.; Ingier-Stocka,E.; Berkani,M.; Gaune-Escard,M.; J. Chem. Eng. Data 2007, 52, 1209-1212
  3. ^ Morosin, B.; J. Chem. Phys. 49, 1968, 3007
  4. ^ 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
  5. ^ Higgins, W.; Churilov, A.; van Loef, E.; Glodo, J.; Squillante, M.; Shah, K.; J. Crys.Gr. 310 2008 2085–2089.