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	PRODUCT DATA of Germanium

Material

Germanium

General Information

The refractive index of Germanium changes rapidly with temperature and the material becomes opaque at all wavelengths a little above 350K as the band gap floods with thermal electrons

Chemical Composition

100Ge

CAS Registry ID

7440-56-4

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Equivalent Designations

Ge

Space Experience

Good

	PHYSICAL PROPERTIES

Atomic Number

32

Atomic Weight

72.6 amu

Work Function

4.8 eV

Crystal Structure

Diamond

Specific Gravity

5.33

	ELASTIC PROPERTIES

Tensile Modulus

103 GPa

Shear Modulus

67 GPa

Bulk Modulus

77.2 GPa

Poisson Ratio

0.28

	THERMAL PROPERTIES

Thermal Conductivity

58.6 W/m.

Thermal Expansion Coefficient

6.1 μstrain/°C

Specific Heat

0.31 J/g.K

Melting Range

936 °C