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{{chembox |
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{{chembox |
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| verifiedrevid = 401939356 |
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| verifiedrevid = 443321289 |
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| ImageFile = Caesium-bromide-3D-ionic.png |
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| ImageFile = CsCl polyhedra.png |
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| ImageSize = 200px |
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| ImageSize = |
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| IUPACName = Caesium bromide |
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| ImageFile1 = Caesium-bromide-3D-ionic.png |
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| IUPACName = Cesium bromide |
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| OtherNames = Cesium bromide,<br/>Caesium(I) bromide |
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| OtherNames = Cesium bromide,<br/>Caesium(I) bromide |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 22994 |
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| ChemSpiderID = 22994 |
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| SMILES = . |
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| SMILES = . |
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| InChIKey = LYQFWZFBNBDLEO-REWHXWOFAA |
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| InChIKey = LYQFWZFBNBDLEO-REWHXWOFAA |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI = 1S/BrH.Cs/h1H;/q;+1/p-1 |
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| StdInChI = 1S/BrH.Cs/h1H;/q;+1/p-1 |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey = LYQFWZFBNBDLEO-UHFFFAOYSA-M |
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| StdInChIKey = LYQFWZFBNBDLEO-UHFFFAOYSA-M |
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| CASNo = 7787-69-1 |
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| CASNo = 7787-69-1 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| EINECS = 232-130-0 |
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| EINECS = 232-130-0 |
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| PubChem = 24592 |
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| RTECS = FK9275000 |
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| UNII = 06M25EDM3F |
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| InChI = 1/BrH.Cs/h1H;/q;+1/p-1 |
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| PubChem = 24592 |
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| InChI = 1/BrH.Cs/h1H;/q;+1/p-1 |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = CsBr |
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| Formula = CsBr |
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| MolarMass = 212.81 g/mol |
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| MolarMass = 212.809 g/mol<ref name=r1>Haynes, p. 4.57</ref> |
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| Appearance = White solid |
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| Appearance = White solid |
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| Density = 4.44 g/cm<sup>3</sup>, solid |
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| Density = 4.43 g/cm<sup>3</sup><ref name=r1/> |
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| MeltingPt = 636 °C |
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| MeltingPtC = 636 |
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| MeltingPt_ref = <ref name=r1/> |
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| BoilingPt = 1300 °C |
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| BoilingPtC = 1300 |
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| Solubility = 1062 g/L (15 °C)<br/>1243 g/L (25 °C) |
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| BoilingPt_ref = <ref name=r1/> |
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| Solubility = 1230 g/L (25 °C)<ref name=r1/> Disputed. |
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420 g/L (11 °C) See References<br/> 560 /L (15°C)<br/>1020 g/L (28.5 °C)<br/>1180 g/L (31 °C)<br/>1240 g/L (32.5 °C)<br/>1380 g/L (35 °C) |
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| RefractIndex = 1.8047 (0.3 μm)<br/>1.6974 (0.59 μm)<br/>1.6861 (0.75 μm)<br/>1.6784 (1 μm)<br/>1.6678 (5 μm)<br/>1.6439 (20 μm)<ref>Haynes, p. 10.240</ref> |
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| MagSus = -67.2·10<sup>−6</sup> cm<sup>3</sup>/mol<ref>Haynes, p. 4.132</ref> |
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| Section3 = {{Chembox Structure |
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|Section3={{Chembox Structure |
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| CrystalStruct = ] |
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| CrystalStruct = ], ] |
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| SpaceGroup = Pm{{overline|3}}m, No. 221<ref name=str2>{{cite journal|doi=10.1063/1.1713597|title=Elastic Constants of CsBr and CsI from 4.2K to Room Temperature|journal=Journal of Applied Physics|volume=35|issue=4|pages=1222|year=1964|last1=Vallin|first1=J.|last2=Beckman|first2=O.|last3=Salama|first3=K.|bibcode=1964JAP....35.1222V}}</ref> |
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| Coordination = 8–8 |
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| LattConst_a = 0.4291 nm |
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| UnitCellFormulas = 1 |
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| UnitCellVolume =0.0790 nm<sup>3</sup> |
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| Coordination = Cubic (Cs<sup>+</sup>)<br/>Cubic (Br<sup>−</sup>) |
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| Section4 = {{Chembox Hazards |
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|Section4={{Chembox Hazards |
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| EUIndex = Not listed |
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| NFPA-H = 2 |
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| RPhrases = |
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| NFPA-F = 0 |
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| SPhrases = |
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| NFPA-R = 0 |
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| GHSSignalWord=Warning |
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| FlashPt = Non-flammable |
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| GHSPictograms={{GHS07}} |
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| HPhrases = {{H-phrases|302|315|319|335}} |
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| PPhrases = {{P-phrases|261|264|270|271|280|301+312|302+352|304+340|305+351+338|312|321|330|332+313|337+313|362|403+233|405|501}} |
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| FlashPt = Non-flammable |
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| LD50 = 1400 mg/kg (oral, rat)<ref>. nlm.nih.gov</ref> |
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| Section8 = {{Chembox Related |
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|Section8={{Chembox Related |
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| OtherAnions = ],<br/>],<br/>] |
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| OtherAnions = ]<br/>]<br/>]<br/>] |
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| OtherCations = ],<br/>]<br/>] |
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| OtherCations = ]<br/>]<br/>]<br/>] |
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'''Caesium bromide''', (CsBr), is an ionic ] of ] and ]. It has simple cubic p-type cubic crystallic structure, comparable to that of ] type with ] ''Pm{{overline|3}}m'' and ] ''a'' = 0.42953 nm. Distance between Cs and Br atoms is 0.37198 nm. |
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'''Caesium bromide''' or '''cesium bromide''' is an ionic ] of ] and ] with the ] CsBr. It is a white or transparent solid with melting point at 636 °C that readily dissolves in water. Its bulk crystals have the cubic CsCl structure, but the structure changes to the ] type in nanometer-thin film grown on ], LiF, KBr or NaCl substrates.<ref name=str>{{cite journal|doi=10.1107/S0365110X51001641|title=Polymorphism of cesium and thallium halides|journal=Acta Crystallographica|volume=4|issue=6|pages=487–489|year=1951|last1=Schulz|first1=L. G.|bibcode=1951AcCry...4..487S }}</ref> |
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== Synthesis == |
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== Synthesis == |
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It can be prepared via following reactions: |
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Caesium bromide can be prepared via following reactions: |
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* ]: |
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* ]: |
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: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l) |
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: CsOH (aq) + HBr (aq) → CsBr (aq) + H<sub>2</sub>O (l) |
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: Cs<sub>2</sub>(CO<sub>3</sub>) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H<sub>2</sub>O (l) + CO<sub>2</sub> (g) |
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: Cs<sub>2</sub>(CO<sub>3</sub>) (aq) + 2 HBr (aq) → 2 CsBr (aq) + H<sub>2</sub>O (l) + CO<sub>2</sub> (g) |
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* Direct synthesis: |
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* Direct synthesis: |
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: 2 Cs (s) + Br<sub>2</sub> (g) → 2 CsBr (s) |
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: 2 Cs (s) + Br<sub>2</sub> (g) → 2 CsBr (s) |
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The direct synthesis is a vigorous reaction of caesium with other halogens. Due to its expensiveness, it is not used for preparation. |
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The direct synthesis is a vigorous reaction of caesium with bromine. Due to its high cost, it is not used for preparation. |
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== Uses == |
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== Uses == |
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Caesium bromide is sometimes used in optics as a ] component in wide-band ]. |
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Caesium bromide is sometimes used in optics as a ] component in wide-band ]. |
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== See also == |
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==References== |
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{{Reflist}}<br/>* {{Webarchive|url=https://web.archive.org/web/20121218002818/http://www.crystran.co.uk/caesium-bromide-csbr.htm |date=2012-12-18 }} |
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* ] |
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==Cited sources== |
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* ] |
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*{{RubberBible92nd}} |
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== External links == |
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== External links == |
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{{Commons category|Caesium bromide}} |
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* {{Webarchive|url=https://web.archive.org/web/20071017044744/http://physchem.ox.ac.uk/MSDS/CA/caesium_bromide.html |date=2007-10-17 }} |
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* {{Webarchive|url=https://web.archive.org/web/20121218002818/http://www.crystran.co.uk/caesium-bromide-csbr.htm |date=2012-12-18 }}, |
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{{Caesium compounds}} |
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{{Caesium compounds}} |
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{{Bromides}} |
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{{Authority control}} |
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