Potassium Bromide KBr

Potassium Bromide (KBr) SDS
Potassium Bromide (KBr) Data Sheet

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.

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Transmission Range
0.23 to 25 μm
Refractive Index
1.527 at 10 μm (1)
Reflection Loss
8.3% at 10 μm (2 surfaces)
Absorption Coefficient
3 x 10-6 @ 1064nm : 14 x 10-6 cm-1 @ 10.6 (7)
Reststrahlen Peak
77.6 μm
dn/dT
-40.8 x 10-6/°C (1)
dn/dμ = 0
4.2 μm
Density
2.753 g/cc
Melting Point
730°C
Thermal Conductivity
4.816 W m-1 K-1 @ 319 K (3)
Thermal Expansion
43 x 10-6/°C @ 300 K (4)
Hardness
Knoop 7 in <100> with 200g indenter (4)
Specific Heat Capacity
435 J Kg-1 K-1
Dielectric Constant
4.9 at 1 MHz (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)
Apparent Elastic Limit
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
 

 

µm 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
µm No
1.014 1.5441
2.440 1.5373
3.419 1.5361
4.258 1.5352
6.238 1.6329
8.662 1.5290
9.724 1.5270
11.04 1.5240
µm No
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

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