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Cerium(III) bromide
Names
	IUPAC names Cerium(III) bromide; Cerium tribromide
	Other names Cerous bromide
Identifiers
CAS Number	14457-87-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	76185 ;
ECHA InfoCard	100.034.936
EC Number	238-447-0;
PubChem CID	292780;
UNII	GEM75FEL39 ;
CompTox Dashboard (EPA)	DTXSID60932338 ;
	InChI InChI=1S/3BrH.Ce/h31H;/q;;;+3/p-3 Key: MOOUSOJAOQPDEH-UHFFFAOYSA-K ; InChI=1/3BrH.Ce/h31H;/q;;;+3/p-3 Key: MOOUSOJAOQPDEH-DFZHHIFOAB;
	SMILES [Ce+3].[Br-].[Br-].[Br-];
Properties
Chemical formula	CeBr3
Molar mass	379.828 g/mol
Appearance	grey to white solid, hygroscopic
Density	5.1 g/cm3, solid
Melting point	722 °C (1,332 °F; 995 K)
Boiling point	1,457 °C (2,655 °F; 1,730 K)
Solubility in water	4.56 mol kg−1 (153.8 g/100 g)
Structure
Crystal structure	hexagonal (UCl3 type), hP8
Space group	P63/m, No. 176
Coordination geometry	Tricapped trigonal prismatic; (nine-coordinate)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) 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.^[2] 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.^[3] 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 the P6₃/m space group.^[4]^[5] The cerium ions are 9-coordinate and adopt a tricapped trigonal prismatic geometry.^[6] The cerium–bromine bond lengths are 3.11 Å and 3.16 Å.^[7]

Applications

CeBr₃-doped lanthanum bromide single crystals are known to exhibit superior scintillation properties for applications in the security, medical imaging, and geophysics detectors.^[8]^[9]

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.^[10]

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References

^ Mioduski, Tomasz; Gumiński, Cezary; Zeng, Dewen; Voigt, Heidelore (2013). "IUPAC-NIST Solubility Data Series. 94. Rare Earth Metal Iodides and Bromides in Water and Aqueous Systems. Part 2. Bromides". Journal of Physical and Chemical Reference Data. 42 (1). AIP Publishing: 013101. Bibcode:2013JPCRD..42a3101M. doi:10.1063/1.4766752. ISSN 0047-2689.
^ Muthmann, W.; Stützel, L. (1899). "Eine einfache Methode zur Darstellung der Schwefel-, Chlor- und Brom-Verbindungen der Ceritmetalle". Berichte der Deutschen Chemischen Gesellschaft (in German). 32 (3). Wiley: 3413–3419. doi:10.1002/cber.189903203115. ISSN 0365-9496.
^ Rycerz, L.; Ingier-Stocka, E.; Berkani, M.; Gaune-Escard, M. (2007). "Thermodynamic Functions of Congruently Melting Compounds Formed in the CeBr₃−KBr Binary System". Journal of Chemical & Engineering Data. 52 (4). American Chemical Society (ACS): 1209–1212. doi:10.1021/je600517u. ISSN 0021-9568.
^ Morosin, B. (1968). "Crystal Structures of Anhydrous Rare-Earth Chlorides". The Journal of Chemical Physics. 49 (7). AIP Publishing: 3007–3012. Bibcode:1968JChPh..49.3007M. doi:10.1063/1.1670543. ISSN 0021-9606.
^ Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421. ISBN 978-0-19-965763-6.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1240–1241. ISBN 978-0-08-037941-8.
^ Zachariasen, W. H. (1948). "Crystal chemical studies of the 5f-series of elements. I. New structure types". Acta Crystallogr. 1 (5): 265–268. Bibcode:1948AcCry...1..265Z. doi:10.1107/S0365110X48000703.
^ van Loef, E. V. D.; Dorenbos, P.; van Eijk, C. W. E.; Krämer, K.; Güdel, H. U. (2001-09-03). "High-energy-resolution scintillator: Ce³⁺ activated LaBr₃". Applied Physics Letters. 79 (10). AIP Publishing: 1573–1575. Bibcode:2001ApPhL..79.1573V. doi:10.1063/1.1385342. ISSN 0003-6951.
^ Menge, Peter R.; Gautier, G.; Iltis, A.; Rozsa, C.; Solovyev, V. (2007). "Performance of large lanthanum bromide scintillators". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 579 (1). Elsevier BV: 6–10. Bibcode:2007NIMPA.579....6M. doi:10.1016/j.nima.2007.04.002. ISSN 0168-9002.
^ Higgins, W.M.; Churilov, A.; van Loef, E.; Glodo, J.; Squillante, M.; Shah, K. (2008). "Crystal growth of large diameter LaBr₃:Ce and CeBr₃". Journal of Crystal Growth. 310 (7–9). Elsevier BV: 2085–2089. Bibcode:2008JCrGr.310.2085H. doi:10.1016/j.jcrysgro.2007.12.041. ISSN 0022-0248.