Difference between revisions of "Caesium iodide"
Physchim62 (talk | contribs) (Imported from http://en.wikipedia.org/w/index.php?title=Caesium_iodide&oldid=291632279) |
Physchim62 (talk | contribs) (identifiers) |
||
| Line 6: | Line 6: | ||
| IUPACName = Caesium iodide | | IUPACName = Caesium iodide | ||
| Section1 = {{Chembox Identifiers | | Section1 = {{Chembox Identifiers | ||
| + | | InChI = 1/Cs.HI/h;1H/q+1;/p-1 | ||
| + | | StdInChI = 1S/Cs.HI/h;1H/q+1;/p-1 | ||
| + | | InChIKey = XQPRBTXUXXVTKB-REWHXWOFAA | ||
| + | | StdInChIKey = XQPRBTXUXXVTKB-UHFFFAOYSA-M | ||
| CASNo = 7789-17-5 | | CASNo = 7789-17-5 | ||
| CASNo_Ref = {{cascite}} | | CASNo_Ref = {{cascite}} | ||
| + | | EC-number = 232-145-2 | ||
| + | | ChemSpiderID = 23003 | ||
}} | }} | ||
| Section2 = {{Chembox Properties | | Section2 = {{Chembox Properties | ||
| + | | Reference = <ref>{{RubberBible62nd|page=B-92}}.</ref> | ||
| Formula = CsI | | Formula = CsI | ||
| MolarMass = 259.81 g/mol | | MolarMass = 259.81 g/mol | ||
| Appearance = white crystalline solid | | Appearance = white crystalline solid | ||
| − | | Density = 4. | + | | Density = 4.510 g/cm<sup>3</sup>, solid |
| Solubility = 44 g/100 ml (0 °C) | | Solubility = 44 g/100 ml (0 °C) | ||
| − | | MeltingPt = | + | | Solubility1 = soluble |
| − | | BoilingPt = | + | | Solvent1 = ethanol |
| + | | MeltingPt = 626 °C | ||
| + | | BoilingPt = 1280 °C | ||
| RefractIndex = 1.739 | | RefractIndex = 1.739 | ||
}} | }} | ||
| − | | | + | | Section3 = {{Chembox Structure |
| + | | CrystalStruct = [[Caesium chloride structure|CsCl]] | ||
| + | | SpaceGroup = Pm3m, No. 221 | ||
| + | | LattConst_a = 456.67 pm | ||
| + | | Coordination = Cubic (Cs<sup>+</sup>)<br/>Cubic (I<sup>−</sup>) | ||
| + | }} | ||
| + | | Section7 = {{Chembox Hazards | ||
| + | | ExternalMSDS = | ||
| + | | EUIndex = not listed | ||
| + | | FlashPt = non-flammable | ||
| + | }} | ||
| + | | Section8 = {{Chembox Related | ||
| OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium bromide]] | | OtherAnions = [[Caesium fluoride]]<br/>[[Caesium chloride]]<br/>[[Caesium bromide]] | ||
| − | | | + | | OtherCations = [[Lithium iodide]]<br/>[[Sodium iodide]]<br/>[[Potassium iodide]]<br/>[[Rubidium iodide]] |
}} | }} | ||
}} | }} | ||
| Line 27: | Line 47: | ||
'''Caesium iodide''' (CsI) is an [[ion]]ic compound often used as the input [[phosphor]] of an [[x-ray image intensifier]] tube found in [[fluoroscopy]] equipment. | '''Caesium iodide''' (CsI) is an [[ion]]ic compound often used as the input [[phosphor]] of an [[x-ray image intensifier]] tube found in [[fluoroscopy]] equipment. | ||
| − | An important application of caesium iodide [[crystals]], which are [[scintillator]]s, is electromagnetic [[Calorimeter (particle physics)|calorimetry]] in experimental [[particle physics]]. Pure CsI is a fast and dense scintillating material with relatively high light yield. It shows two main emission components. One in the near [[ultraviolet]] region at the [[wavelength]] of 310 | + | An important application of caesium iodide [[crystals]], which are [[scintillator]]s, is electromagnetic [[Calorimeter (particle physics)|calorimetry]] in experimental [[particle physics]]. Pure CsI is a fast and dense scintillating material with relatively high light yield. It shows two main emission components. One in the near [[ultraviolet]] region at the [[wavelength]] of 310 nm and one at 460 nm. The drawbacks of CsI are a high [[temperature gradient]] and a slight [[hygroscopicity]]. |
| − | Caesium iodide can be used in [[Fourier transform spectroscopy|Fourier | + | Caesium iodide can be used in [[Fourier transform spectroscopy|Fourier transform infrared]] (FT-IR) spectrometers as a beamsplitter. CsI has a wider transmission range than the more common [[potassium bromide]] beamsplitters, extending usefulness into the far infrared. A problem with optical-quality CsI crystals is that they are very soft with no cleavage, making it difficult to create a flat polished surface. Also, the CsI optical crystals must be stored in a desiccator to prevent water damage to the surfaces, and coated (typically with germanium) to minimise water damage from short term atmospheric exposure during beamsplitter swapouts. |
==Optical properties== | ==Optical properties== | ||
| − | *[[Transmission range]]: 250 nm to 55 | + | *[[Transmission range]]: 250 nm to 55 µm |
*[[Refractive index]]: 1.739 at 10.6 µm | *[[Refractive index]]: 1.739 at 10.6 µm | ||
| − | *[[Return loss|Reflection loss]]: 13.6% | + | *[[Return loss|Reflection loss]]: 13.6% at 10.6 µm (2 surfaces) |
==Physical properties== | ==Physical properties== | ||
| Line 41: | Line 61: | ||
*[[Modulus of rupture]]: 5.6 GPa (810 lbf/in<sup>2</sup>) | *[[Modulus of rupture]]: 5.6 GPa (810 lbf/in<sup>2</sup>) | ||
*Apparent [[elastic limit]]: 5.6 GPa (810 lbf/in<sup>2</sup>) | *Apparent [[elastic limit]]: 5.6 GPa (810 lbf/in<sup>2</sup>) | ||
| − | |||
| − | |||
==References== | ==References== | ||
| − | {{ | + | {{reflist}} |
| − | |||
[[Category:Caesium compounds]] | [[Category:Caesium compounds]] | ||
Latest revision as of 08:23, 25 August 2009
| Caesium iodide | |
|---|---|
| |
| IUPAC name | Caesium iodide |
| Identifiers | |
| InChI | InChI=1/Cs.HI/h;1H/q+1;/p-1 |
| InChIKey | XQPRBTXUXXVTKB-REWHXWOFAA |
| Standard InChI | InChI=1S/Cs.HI/h;1H/q+1;/p-1 |
| Standard InChIKey | XQPRBTXUXXVTKB-UHFFFAOYSA-M |
| CAS number | [] |
| EC number | |
| ChemSpider | |
| Properties[1] | |
| Chemical formula | CsI |
| Molar mass | 259.81 g/mol |
| Appearance | white crystalline solid |
| Density | 4.510 g/cm3, solid |
| Melting point |
626 °C |
| Boiling point |
1280 °C |
| Solubility in water | 44 g/100 ml (0 °C) |
| Solubility in ethanol | soluble |
| Refractive index (nD) | 1.739 |
| Structure | |
| Crystal structure | CsCl |
| Space group | Pm3m, No. 221 |
| Lattice constant | a = 456.67 pm |
| Coordination geometry | Cubic (Cs+) Cubic (I−) |
| Hazards | |
| EU index number | not listed |
| Flash point | non-flammable |
| Related compounds | |
| Other anions | Caesium fluoride Caesium chloride Caesium bromide |
| Other cations | Lithium iodide Sodium iodide Potassium iodide Rubidium iodide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Caesium iodide (CsI) is an ionic compound often used as the input phosphor of an x-ray image intensifier tube found in fluoroscopy equipment.
An important application of caesium iodide crystals, which are scintillators, is electromagnetic calorimetry in experimental particle physics. Pure CsI is a fast and dense scintillating material with relatively high light yield. It shows two main emission components. One in the near ultraviolet region at the wavelength of 310 nm and one at 460 nm. The drawbacks of CsI are a high temperature gradient and a slight hygroscopicity.
Caesium iodide can be used in Fourier transform infrared (FT-IR) spectrometers as a beamsplitter. CsI has a wider transmission range than the more common potassium bromide beamsplitters, extending usefulness into the far infrared. A problem with optical-quality CsI crystals is that they are very soft with no cleavage, making it difficult to create a flat polished surface. Also, the CsI optical crystals must be stored in a desiccator to prevent water damage to the surfaces, and coated (typically with germanium) to minimise water damage from short term atmospheric exposure during beamsplitter swapouts.
Optical properties
- Transmission range: 250 nm to 55 µm
- Refractive index: 1.739 at 10.6 µm
- Reflection loss: 13.6% at 10.6 µm (2 surfaces)
Physical properties
- Hardness (Knoop): 137.9 kPa (20 lbf/in2)
- Young's modulus: 5.3 GPa (769 lbf/in2)
- Modulus of rupture: 5.6 GPa (810 lbf/in2)
- Apparent elastic limit: 5.6 GPa (810 lbf/in2)
References
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-92. ISBN 0-8493-0462-8.
| Error creating thumbnail: Unable to save thumbnail to destination |  |
This page was originally imported from Wikipedia, specifically this version of the article "Caesium iodide". Please see the history page on Wikipedia for the original authors. This WikiChem article may have been modified since it was imported. It is licensed under the Creative Commons Attribution–Share Alike 3.0 Unported license. |
