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Potassium Bromide (KBr)

♦ Potassium Bromide (KBr) Data Sheet   ♦ Potassium Bromide (KBr) MSDS

Potassium Bromide is one of the most useful materials for general purpose spectroscopic windows and applications where sensitivity to moisture is unimportant. Potassium Bromide is the most commonly used beamsplitter material for IR spectrophotometers.

Transmission Range : 0.23 to 25 μm
Refractive Index : 1.527 at 10 μm (1)
Reflection Loss : 8.3% at 10 μm
Absorption Coefficient : 3 x 10-6 @ 1064nm : 14 x 10-6 cm-1 @ 10.6 (7)
Reststrahlen Peak : 77.6 μm
dn/dT : -40.83 x 10-6/°C (1)
dn/dμ = 0 : 4.2 μm
Density : 2.753 g/cc (2)
Melting Point : 730°C
Thermal Conductivity : 4.816 W m-1 K-1 @ 319K (3)
Thermal Expansion : 43 x 10-6 /°K @300K (4)
Hardness : Knoop 7 in <100> with 200g indenter (4)
Specific Heat Capacity : 435 J Kg-1 K-1
Dielectric Constant : 4.9 @ 1MHz (6)
Youngs Modulus (E) : 26.8 GPa (4)
Shear Modulus (G) : 5.08 GPa (4)
Bulk Modulus (K) : 15.03 GPa (4)
Elastic Coefficients : C11=34.5 C12=5.4 C44=5.08 (5)
Rupture Modulus : 3.3 MPa (475psi) (4)
Poisson Ratio : 0.203
Solubility : 53.48g/100g water at 273K
Molecular Weight : 119.01
Class/Structure : Cubic FCC, NaCl, Fm3m, (100) cleavage

 

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.

Click to access current Potassium Bromide Stock Windows


µm   Noµm   Noµm   No
0.405    1.5898 0.436    1.5815 0.486    1.5718
0.508    1.5684 0.546    1.5639 0.587    1.5600
0.643    1.5559 0.707    1.5524 1.014    1.5441
2.440    1.5373 3.419    1.5361 4.258    1.5352
6.238    1.5329 8.662    1.5290 9.724    1.5270
11.04    1.5240 14.29    1.5150 17.40    1.5039
19.91    1.4929 23.86    1.4714 25.14    1.4632
28.00    1.4423 30.00    1.4253

Potassium Bromide is produced in large ingots by the Kyropoulos growth method. Potassium Bromide cleaves easily. With care Potassium Bromide can be polished to a high standard under humidity controlled conditions.

REFERENCES:
(1) Stephens et. al.; J.Opt. Soc. Am. V43, p111, 1953
(2) Kohler; Z. Physik. Volk 78, p375. 1932
(3) Ballard, McCarthy & Davis; Rev. Sci. Insts, V21, p905, 1970
(4) Combes, et.al.; J.Opt. Soc. Am. V41, p215, 1951.
(5) Huntingdon; Phys.Rev. V72, p321, 1947
(6) Hipple; Dielectric Materials & Applications. Wiley
(7) H.H.Li, Absorption Coefficients, Int.J.Therm, V1, No. I, 1980