Potassium Chloride KCl
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Transmission Range
0.21 to 20 μm
Refractive Index
1.45644 at 10 μm (2)
Reflection Loss
6.7% at 10 μm (2 surfaces)
Absorption Coefficient
6.5 x 10-3 cm-1 at 10.6 μm @ 300K (6)
Reststrahlen Peak
63.1 μm
dn/dT
-33.2 x 10-6 K-1 (1)
dn/dμ = 0
n/a
Density
1.99 g/cc
Melting Point
776°C
Thermal Conductivity
6.53 W m-1 K-1 @ 322 K (3)
Thermal Expansion
36 x 10-6/°C @ 300 K
Hardness
Knoop 7.2 <110>, 9.3 <100> with 200g indenter (4)
Specific Heat Capacity
690 J Kg-1 K-1
Dielectric Constant
4.64 at 1 MHz at 300K
Youngs Modulus (E)
29.67 GPa (4)
Shear Modulus (G)
6.24 GPa (4)
Bulk Modulus (K)
17.36 GPa (4)
Elastic Coefficients
C11=39.8; C12=6.2; C44=6.25 (5)
Apparent Elastic Limit
4.4 MPa (635psi) (5)
Poisson Ratio
0.216
Solubility
34.7g/100g water
Molecular Weight
74.55
Class/Structure
Cubic FCC, NaCl, Fm3m, (100) cleavage
| µm | No |
|---|---|
| 0.185 | 1.8271 |
| 0.200 | 1.7187 |
| 0.251 | 1.5897 |
| 0.308 | 1.54136 |
| 0.410 | 1.50907 |
| 0.509 | 1.4962 |
| 0.671 | 1.48669 |
| 0.883 | 1.48142 |
| 0.982 | 1.4800 |
| 1.179 | 1.47831 |
| 2.3571 | 1.47475 |
| 2.9471 | 1.47883 |
| 3.536 | 1.47305 |
| µm | No |
|---|---|
| 4.715 | 1.47112 |
| 5.00 | 1.47048 |
| 6.00 | 1.46842 |
| 7.00 | 1.466 |
| 8.00 | 1.4629 |
| 9.00 | 1.46002 |
| 10.0 | 1.45644 |
| 11.0 | 1.45244 |
| 12.0 | 1.44801 |
| 13.0 | 1.44313 |
| 14.0 | 1.43779 |
| 15.0 | 1.43197 |
| 16.0 | 1.42563 |
| µm | No |
|---|---|
| 17.0 | 1.41877 |
| 18.0 | 1.41134 |
| 19.0 | 1.40333 |
| 20.0 | 1.39469 |
| 21.0 | 1.38538 |
| 22.0 | 1.37537 |
| 23.0 | 1.36461 |
| 24.0 | 1.35303 |
| 25.0 | 1.34059 |
| 26.0 | 1.32721 |
| 27.0 | 1.31281 |
| 28.0 | 1.29731 |
Potassium Chloride is produced in large ingots by the Kyropoulos growth method. Potassium Chloride cleaves easily. With care Potassium Chloride can be polished to a high standard under humidity controlled conditions.
REFERENCES:
(1) Mentzel; Z. Physik. V 88, p178. 1934
(2) H.H.Li; RI of Alkali Halides. J. Phys and Chem Reference Data V5(2), p421, 1976
(3) Ballard, McCarthy & Davis; Rev. Sci. Insts, V21, p905, 1970
(4) Combes, et.al.; J.Opt. Soc. Am. V41, p215, 1951.
(5) Galt; Phys.Rev. V36, p1460, 1948
(6) H.H.Li, Absorption Coefficients, Int.J.Therm, V1, No. I, 1980