Mateck Germanium (Ge)

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Mateck Germanium (Ge)
Categories:	Pure Element
Material Notes:	Optical crystals
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Physical Properties	Original Value	Comments

Density	5.33 g/cc @Temperature 25.0 °C
Solubility	0.00 ppm
a Lattice Constant	5.657 Å
Molecular Weight	72.61 g/mol

Mechanical Properties	Original Value	Comments
Vickers Microhardness	9000	MPa
Hardness, Mohs	6.0
Modulus of Elasticity	103.2 GPa	in <100> direction
	155.6 GPa	in <111> direction
Poissons Ratio	0.278
Shear Modulus	46.7 GPa	in <111> direction
	67.2 GPa	in <100> direction

Thermal Properties	Original Value	Comments
CTE, linear	5.10 - 5.80 µm/m-°C @Temperature -60.0 - 60.0 °C
Specific Heat Capacity	0.310 J/g-°C
Thermal Conductivity	59.8 W/m-K @Temperature 27.0 °C
Melting Point	937 °C

Optical Properties	Original Value	Comments
Refractive Index	4.0034	n10.6
	4.0017 @Wavelength 15000 nm
	4.004 @Wavelength 10000 nm
	4.0076 @Wavelength 7000 nm
	4.1079 @Wavelength 2000 nm
IR Transmittance	56 % @Wavelength 15000 nm	Internal Transmittance
	70 % @Wavelength 12000 nm	Internal Transmittance
	97 % @Wavelength 3000 nm	Internal Transmittance
	97 % @Wavelength 9000 nm	Internal Transmittance

Descriptive Properties
Cleavability	(111)	perfect
Constants of Elastic Compliance (Pa^-1)	1.489E-11
	-2.65E-12
	9.69E-12
Symmetry	cubic
Symmetry Class	m3m
Thermal Coefficient of Refractive Index	3.5E-4 to 4E-4	3.39 microns for ± 60°C
Transmission Range (microns)	2 - 17

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CMAT043 / 87727

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