Cesium Iodide

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CESIUM IODIDE, CsI

Cesium Iodide is used for prisms and cell windows in the infrared up to 50 µm. Cesium Iodide is highly soluble in water and must be protected from moisture. The material is relatively soft, does not cleave and can withstand shock and rapid temperature changes. Maximum available size: 200 mm Dia x 100 mm Thk.

Main Properties

Chemical Formula

CsI

Crystal Class

Cubic

Lattice Constant, Å

4.57

Density, g/cm³ at 291 K

4.51

Dielectric Constant for 10⁶ Hz at 298 K

5.65

Melting Temperature, K

894

Thermal Conductivity, W/(m K) at 298 K

1.1

Thermal Expansion, 1/K at 293 K

39.1 x 10^-6

Specific Heat, cal/(g K) at 293 K

0.048

Debye Temperature, K

93.6

Bandgap, eV

6.2

Solubility, g/100 g H₂O at 273 K

44

Young's Modulus, GPa

5.30

Reflection Loss for two surfaces at 10 um, %

13.6

Refractive Index

Wavelength, µm

0.29

0.32

0.35

0.39

0.46

0.52

0.64

0.92

9.0

24.4

33.0

39.5

44.7

49.3

Refractive Index

1.98

1.94

1.90

1.86

1.82

1.80

1.78

1.76

1.74

1.72

1.70

1.68

1.66

1.64