Potassium Chloride KCl

Potassum Chloride (KCl) SDS
Potassium Chloride (KCl) Data Sheet

Potassium Chloride is mainly used for CO2 laser protection windows as an inexpensive disposable material with a low refractive index.

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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

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