CsI
Caesium Iodide
|
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. |
Properties
|
| 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 |
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Properties of CsI