溴化钾 Potassium Bromide (KBr)

Syngony

Cubic

Symmetry Class

m3m

Lattice Constants

a = 6.598 Å

c = a

Cleavability

(100), perfect

Refractive Index at n_e

1.5639

Refractive Index at n_F' - n_C'

0.0617

Refractive Index at n_10.6

1.5251

Refractive Index at n_8.0 - n_12.5

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 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

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

Molecular Weight

119.01

Solubility

in water, gram/100 cm³

53.48

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

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