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Products › Materials › Potassium Bromide (KBr)
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Potassium Bromide (KBr) |
| 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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Product Data |
| 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) |
| 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 |
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
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Refractive Index |
| µm |
No |
µm |
No |
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 |
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 |
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Product Notes |
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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Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, Crystran Ltd accept no responsibility for accuracy of data |
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