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锗 Germanium (Ge)

Crystallographic


Syngony

Cubic

Symmetry Class

m3m

Lattice Constants

a = 5.657 Å

c = a

Cleavability

(111), perfect


Optical


Refractive Index at n10.6

4.0034

Refractive Index at n8.0 - n12.5

0.0036

Thermal Coefficient of Refractive Index at 3.39 microns for ±60 ℃

35 - 40 x 10-5

Transmission Range, microns

2 - 17


Thermal


Thermal Linear Expansion, ℃-1 for ±60 ℃

(5.1 ... 5.8) x 10-6

Thermal Conductivity, W/(m * ℃) at 27 ℃

59.8

Specific Heat Capacity, J/(kg * ℃)

0.310

Melting Point, ℃

937

Absorbance μ(λ) , cm-1


at 10.6 microns

0.027


Mechanical


Density, g/cm3 at 25 ℃

5.33

Mohs Hardness

6

Vickers Microhardness, Pa

900 x 107

Constants of Elastic Compliance, Pa-1

S11 = 9.69 x 10-12 S12 = -2.65 x 10-12

S44 = 14.89  x 10-12

Young Modulus (E), Pa


in <100> direction

10.32x 1010

in <111> direction

15.56 x 1010

Shear Modulus (G), Pa


in <100> direction

6.72 x 1010

in <111> direction

4.67 x 1010

Poisson Ratio

0.278


Chemical


Molecular Weight

72.61

Solubility


in water, gram/100 cm3

insoluble


Ref. Index vs. Wavelength λ


Wavelength, Microns

Refractive Index

2.0

4.1079

3.0

4.0446

4.0

4.0242

5.0

4.0153

6.0

4.0106

7.0

4.0076

8.0

4.0053

9.0

4.0047

10.0

4.0040

11.0

4.0031

12.0

4.0029

12.5

4.0024

15.0

4.0017


Internal Transmittance


Wavelength, Microns

Internal Transmittance

3.0

0.97

5.0

0.97

6.0

0.97

7.0

0.97

8.0

0.97

9.0

0.97

10.0

0.96

12.0

0.70

15.0

0.56


Custom sizes and specifications are available on request.


 

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