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溴化钾 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 ℃

(-3.95) ... (-4.29) x 10-5

Transmission Range, microns

0.21 - 28


Thermal


Thermal Linear Expansion, ℃-1 for ±60 ℃

(36.6 ... 39.6) x 10-6

Thermal Conductivity, W/(m * ℃) at 46 ℃

4.81

Specific Heat Capacity, J/(kg * ℃)

0.4522 x 103

Melting Point, ℃

728


Mechanical


Density, g/cm3 at 20 ℃

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 λ


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 τ i (λ) vs. Wavelength λ


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.


 

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