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CsI
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Caesium Iodide
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Description
The material with the deepest known IR transmission, CsI is sometimes used for components in the widest range spectrophotometers. An extremely soft material it is extremely difficult to polish and so performance is compromised for range. Doped with thallium, CsI(Tl) is a useful scintillator which emits at a wavelength which is a good match for silicon photodiodes. Arrays of this material are used in security imaging systems.
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Properties
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| Apparent Elastic Limit (MPa) |
5.6 (810psi) |
| Bulk Modulus (K) (GPa) |
12.67 |
| Cleavage Planes |
None |
| Decay Constant (µs) |
0.03 & 0.1 |
| Density (g·cm-3) |
4.51 |
| Dielectric Constant |
5.65 at 1MHz |
| Elastic Coefficient C11 |
24.6 |
| Elastic Coefficient C12 |
6.7 |
| Elastic Coefficient C44 |
6.24 |
| Emission Spectral Range (nm) |
250 to 500 |
| Hardness (knoop) (100) direction |
20.0 |
| Melting Point (°C) |
621 |
| Molecular Weight |
259.83 |
| Peak Scintillation Wavelength (nm) |
310 |
| Photons/MeV |
16,800 |
| Poisson Ratio |
0.214 |
| Radiation Length (cm) |
1.86 |
| Reflection Loss (%) |
13.6 at 11µ (2 surfaces) |
| Refractive Index |
1.78 at 10µ |
| Shear Modulus (G) (GPa) |
6.24 |
| Solubility (g/100g H2O) |
44.0 at 273K |
| Specific Heat Capacity (J·kg·m-1·K-1) |
201 |
| Stability |
Deliquescent |
| Structure |
Cubic |
| Temperature Coefficient of Light Output (%·K-1) |
-0.53 |
| Thermal Conductivity (W·m-1·K-1) |
1.1 at 298K |
| Thermal Expansion (K-1) |
48.3 X 10-6 at 293K |
| Transmission Range (µ) |
0.25 to 55.0 |
| Youngs Modulus (E) (GPa) |
5.3 |
