|
|
|
Syngony
|
Cubic
|
|
Symmetry Class
|
m3m
|
|
Lattice Constants, Angstroms
|
a=6.598 c=a
|
|
Cleavability
|
(100), perfect
|
|
|
|
|
Refractive Index at ne
|
1.5639
|
|
Refractive Index at nF'-nC'
|
0.0617
|
|
Refractive Index at n10.6
|
1.5251
|
|
Refractive Index, n8.0-n12.5
|
0.0099
|
|
Thermal Coefficient of Refractive Index at l=3.39 microns, îÑ-1
for +/-60îÑ
|
(-3.95...-4.29)• 10-5
|
|
Transmission Range, microns (thickness 10ìì)
|
0.21¸28
|
|
Transmittance ti(l) vs. wavelength l
|
KBr Potassium Bromide
|
|
|
|
|
|
|
Internal Transmittance ti(l) vs.
wavelength l
|
|
l,ìêì
|
ti(l)
|
|
0.2
|
0.48
|
|
0.5
|
0.98
|
|
1.0
|
0.98
|
|
3.0
|
0.98
|
|
5.0
|
0.98
|
|
6.0
|
0.98
|
|
7.0
|
0.98
|
|
8.0
|
0.98
|
|
9.0
|
0.98
|
|
10.0
|
0.98
|
|
12.0
|
0.98
|
|
15.0
|
0.98
|
|
20.0
|
0.92
|
|
30.0
|
0.26
|
|
|
|
Refractive Index n vs.
wavelength l
|
|
l,ìêì
|
n(l)
|
|
0.2
|
2.0995
|
|
0.5
|
1.5700
|
|
1.0
|
1.5444
|
|
2.0
|
1.5383
|
|
3.0
|
1.5368
|
|
4.0
|
1.5357
|
|
5.0
|
1.5346
|
|
6.0
|
1.5334
|
|
7.0
|
1.5319
|
|
8.0
|
1.5303
|
|
9.0
|
1.5285
|
|
10.0
|
1.5265
|
|
11.0
|
1.5242
|
|
12.0
|
1.5217
|
|
12.5
|
1.5204
|
|
15.0
|
1.5127
|
|
20.0
|
1.4924
|
|
30.0
|
1.4253
|
|
|
|
|
|
Thermal Linear Expansion at, îÑ-1 for +/-60îÑ
|
(36.6¸39.6)• 10-6
|
|
Thermal Conductivity, W/(m • îÑ) at 46 îÑ
|
4.81
|
|
Specific Heat Capacity, J/(kg • îÑ) at 100 îÑ
|
452.2
|
|
Melting Point, îÑ
|
728
|
|
|
|
|
Density, g/cm3 at 20 îÑ
|
2.75
|
|
Mohs Hardness
|
1.5
|
|
Vickers Microhardness , Pa
|
1• 108
|
|
Constants of Elastic Compliance, Pa-1
|
S11
|
30.29• 10-12
|
|
S12
|
-4.18• 10-12
|
|
S44
|
194.92• 10-12
|
|
Poisson Ratio
|
0.278
|
|
Young Modulus (Å), Pa
|
<100>
|
3.30• 1010
|
|
<100>
|
1.38• 1010
|
|
Shear Modulus (G), Pa
|
(100)
|
0.90• 1010
|
|
(100)
|
0.51• 1010
|
|
|
|
|
Solubility KBr
|
|
in water at 20 îÑ
g/100cm3
|
in acids
|
|
53.48
|
soluble
|
|
"Opto-Technological Laboratory" produces lenses, windows, prisms, wedges, windows for spectrophotometers and others optical components according to customers’ specifications and drawings out of crystals potassium bromide ( KBr ) . |
