Caesium Iodide (CsI)

Crystallographic

Syngony	Cubic
Symmetry Class	m3m Pm3m
Lattice Constants	a = 4.567 Å

 

Optical

Refractive Index at n10.0	1.740
Refractive Index at n40.0	1.678
Thermal Coefficient of Refractive Index for 0-30°C	(-1.27) ... (-1.51) x 10-5
Transmission Range, microns	0.25 - 55
Absorbance m (l), cm -1
at 40 microns	0.1
at 45 microns	0.33
at 50 microns	0.5

 

Thermal

Thermal Linear Expansion, °C-1 for 0-30 °C	48.1 x 10-6
Thermal Conductivity, W/(m * °C) at 25 °C	1.1
Specific Heat Capacity, J/(kg * °C)	200
Melting Point, °C	621

 

Mechanical

Density, g/cm3	4.509
Mohs Hardness	1-2
Young Modulus (E), Pa	2 x 109
Shear Modulus (G), Pa	6.24 x 109
Poisson Ratio	0.214

 

Chemical

Molecular Weight	259.81
Solubility
in water, gram/100 cm3	44
in acids	soluble

 

Ref. Index vs. Wavelength l

Wavelength, Microns	Refractive Index
0.25	2.210
0.5	1.807
1.0	1.758
2.0	1.747
3.0	1.744
5.0	1.743
10.0	1.740
15.0	1.735
20.0	1.728
25.0	1.719
30.0	1.708
35.0	1.695
40.0	1.678
45.0	1.659
50.0	1.637
55.0	1.611

Custom sizes and specifications are available on request.