Potassium bromide ( KBr )
Crystal properties |
|
|
Crystal Type |
cubic, NaCl type structure |
|
Transmission Range |
0.23 ... 25 µm |
|
Refractive Index |
1.52695 @ 9.724 µm |
|
Reflective Loss |
8.4 % @ 10.0 µm |
|
Reststrahlen |
77.6 µm |
|
Density. |
2.7533 g/cm3 |
|
Melting Point |
730 °C |
|
Molecular Weight |
119.002 |
|
Thermal Conductivity |
4.816 W/(m K) @ 46 °C |
|
Specific Heat |
435 J/(kg K) @ 0 °C |
|
Thermal Expansion. |
43 × 10–6 / K |
|
Hardness (Knoop) |
5.9 <110> |
|
Young’s Modulus |
26.8 GPa |
|
Shear Modulus |
5.08 GPa |
|
Bulk Modulus |
15.03 GPa |
|
Rupture Modulus |
0.33 MPa |
|
Elastic Coefficient |
C11 = 34.5 |
|
Dielectric Constant |
5.65 @ 25 °C, f = 100 Hz ... 10 GHz |
|
Solubility in Water |
53.4 g / 100 g @ 0 °C |
|
Crystal Structure |
Single crystal, synthetic |
|
Cleavage Planes |
(100) |
|
Standard Diameter |
180 mm |
|
Application |
IR spectroscopy |
|
Remarks |
coatings available |
List of Optical Crystals |
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Materials |
Refractive Index |
Transmission |
Density |
Thermal Expansion |
BK7 glass |
1.5164 (588 nm) |
0.330 – 2.1 |
2.51 |
7.5 |
SF11 glass |
1.78472 (588 nm) |
0.370 – 2.5 |
4.74 |
6.8 |
F2 glass |
1.62004 (588 nm) |
0.420 – 2.0 |
3.61 |
8.2 |
Fused Silica |
1.4858 (308 nm) |
0.185 – 2.5 |
2.20 |
0.55 |
CaF2 |
1.399 (5.0 mm) |
0.170 – 7.8 |
3.18 |
18.85 |
BaF2 |
1.460 (3.0 um) |
0.15 – 12.0 |
4.88 |
18.4 |
Sapphire |
1.755 (1.0mm) |
0.180 – 4.5 |
3.98 |
8.4 |
Silicon |
3.4179 (10mm) |
1.200 – 7.0 |
2.33 |
4.15 |
Ge |
4.003 (10 mm) |
1.900 – 16 |
5.33 |
6.1 |
ZnSe |
2.40 (10 mm) |
0.630 – 18 |
5.27 |
7.8 |
ZnS |
2.2 (10mm) |
0.380 –14 |
4.09 |
6.5 |
LiF |
1.39 (500 nm) |
0.150 – 5.2 |
2.64 |
37 |
KBr |
1.526 (10 mm) |
0.280 – 22 |
2.75 |
43 |
MgF2 |
no = 1.3836 |
0.130 – 7.0 |
7.37 |
a: 13.7 |
YVO4 |
no = 1.9500 |
0.400 – 5.0 |
4.22 |
a: 4.46 |
Calcite |
no = 1.6557 |
0.210 – 2.3 |
2.75 |
a: 24.39 |
Quartz |
no = 1.5427 |
0.200 – 2.3 |
2.65 |
7.07 |
?-BBO |
no = 1.6749 |
0.190 – 3.5 |
3.85 |
a: 4.0 |
LiNbO3 |
no = 2.2863 |
0.370 – 4.5 |
4.64 |
a: 16.7 |