Potassium Bromide (KBr)

Crystallographic

Syngony	Cubic
Symmetry Class	m3m
Lattice Constants	a = 6.598 Å c = a
Cleavability	(100), perfect

 

Optical

Refractive Index at ne	1.5639
Refractive Index at nF' - nC'	0.0617
Refractive Index at n10.6	1.5251
Refractive Index at n8.0 - n12.5	0.0099
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C	(-3.95) ... (-4.29) x 10-5
Transmission Range, microns	0.21 - 28

 

Thermal

Thermal Linear Expansion, °C-1 for ±60 °C	(36.6 ... 39.6) x 10-6
Thermal Conductivity, W/(m * °C) at 46 °C	4.81
Specific Heat Capacity, J/(kg * °C)	0.4522 x 103
Melting Point, °C	728

 

Mechanical

Density, g/cm3 at 20 °C	2.75
Mohs Hardness	1.5
Vickers Microhardness, Pa	10 x 107
Constants of Elastic Compliance, Pa-1	S11 = 30.29 x 10-12 S12 = -4.18 x 10-12 S44 = 194.92 x 10-12
Young Modulus (E), Pa
in <100> direction	3.30 x 1010
in <110> direction	1.38 x 1010
Shear Modulus (G), Pa
in <100> direction	0.90 x 1010
in <110> direction	0.51 x 1010
Poisson Ratio	0.138

 

Chemical

Molecular Weight	119.01
Solubility
in water, gram/100 cm3	53.48

 

Ref. Index vs. Wavelength l

Wavelength, Microns	Refractive Index
0.2	2.0995
0.5	1.5700
1.0	1.5444
2.0	1.5383
3.0	1.5357
4.0	1.5346
5.0	1.5334
6.0	1.5319
7.0	1.5303
8.0	1.5285
9.0	1.5265
10.0	1.5242
11.0	1.5217
12.0	1.5204
15.0	1.5127
20.0	1.4924
30.0	1.4253

 

Internal Transmittance t i (l) vs. Wavelength l

Wavelength, Microns	Internal Transmittance
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
15.0	0.98
30.0	0.26

Custom sizes and specifications are available on request.