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Cesium Bromide (Caesium Bromide) (CsBr)

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

Cesium Bromide has limited application in the deep IR. Cesium 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.



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.