Бромистый Калий KBr

МакроОптика produces lenses, windows, prisms, wedges and others optical components according to customers’ specifications and drawings out of crystals 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.

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.

Product Data

Transmission Range  0.23 to 25 Ојm
Refractive Index  1.527 at 10 Ојm (1)
Reflection Loss  8.3% at 10 Ојm
Absorption Coefficient  3 x 10-6 @ 1064nm : 14 x 10-6 cm-1 @ 10.6 (7)
Reststrahlen Peak  77.6 Ојm
dn/dT  -40.83 x 10-6/В°C (1)
dn/dОј 0 : 4.2 Ојm
Density  2.753 g/cc (2)
Melting Point  730В°C
Thermal Conductivity  4.816 W m-1 K-1 @ 319K (3)
Thermal Expansion  43 x 10-6 /В°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

Transmittance

Refractive Index

No = Ordinary Ray

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