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Caesium Bromide (CsBr)

♦ Caesium Bromide (CsBr) Data Sheet      ♦ Caesium Bromide (CsBr) MSDS

Caesium Bromide has limited application in the deep IR. Caesium Bromide is slightly more amenable to optical working than CsI and is sometimes used as a beamsplitter component in wide-band spectrophotometers

Transmission Range : 0.25 to 40 μm (1)
Refractive Index : 1.6612 at 11 μm (1)
Reflection Loss : 11.6% at 11 μm (2 surfaces)
Absorption Coefficient : n/a
Reststrahlen Peak : 121.2 μm (2)
dn/dT :  -84 x 10-6/°C at 0.6 μm (5)
dn/dμ = 0 : 5.3 μm
Density : 4.44 g/cc
Melting Point : 636 °C
Thermal Conductivity : 0.94 W m-1 K-1 at 273K
Thermal Expansion : 47.9 x 10-6 /°C at 273K
Hardness : Knoop 19.5 with 200g indenter
Specific Heat Capacity : 263.8 J Kg-1 K-1 (3)
Dielectric Constant : 6.51 at 2 MHz
Youngs Modulus (E) : 15.85 GPa (4)
Shear Modulus (G) : 7.5 GPa
Bulk Modulus (K) : 13.01 GPa
Elastic Coefficients : C11=30.97; C12=4.03; C44=7.5
Apparent Elastic Limit : 8.4 MPa (1220 psi) (4)
Poisson Ratio : 0.279
Solubility : 124.3g/100g water at 273K
Molecular Weight : 212.83
Class/Structure : Cubic CsCl, Pm3m, no cleavage planes

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.


µm   Noµm   Noµm   No
0.5    1.70896 1.0    1.67793 2.0    1.67061
3.0    1.66901 4.0    1.66813 5.0    1.66737
6.0    1.66659 7.0    1.66573 8.0    6477
9.0    1.6637 10.0    1.66251 11.0    1.6612
12.0    1.65976 13.0    1.6582 14.0    1.6561
15.0    1.65468 16.0    1.65272 17.0    1.65062
18.0    1.64838 19.0    1.646 20.0    1.64348
21.0    1.6408 22.0    1.63798 23.0    1.635
25.0    1.62856 26.0    1.62509 27.0    1.62146
28.0    1.61764 29.0    1.61365 30.0    1.60947
31.0    1.6051 32.0    1.60053 33.0    1.59576
34.0    1.59078 35.0    1.58558 36.0    1.58016
37.0    1.5745 38.0    1.5686 39.0    1.56245

Caesium Bromide is grown by sealed ampoule Stockbarger technique. CsBr is a soft pliable material.

REFERENCES:
(1) Handbook Optical Constants, ed Palik, V3, ISBN 0-12-544423-0
(2) Mitsuishi et al., J Opt Soc. Am. V52, p14, 1962
(3) Kelly, Bureau of Mines Bulletin, No371, p51, 1934
(4) S.Ballard et al; J.Opt.Soc.Am. Vol42, p684, 1952
(5) H.H.Li; J.Phys. Chem. Ref. Data. Vol 5, No 2. 1976



It seems that the 1953 paper had a misprint and left out the -ve sign! The 1976 paper corrects this.