Germanium

(

Ge

)
Eigenschaften 
Transmission Range

1.85 - 23 µm (thickness 2 mm)

Refractive Index

4.104147 @633nm 

Reflection Loss 

36.04% @10 µm

Density  

5.327 g/cm3

Melting point  

938.25°C

Molecular Weight 

72.59

Thermal Conductivity  

58.61 W/(m·K)

Spec. Heat Capacity  

310 J/(kg·K) (@0°...100°C)

Thermal Expansion  

5.9 · 10-6/K @293K

Hardness (Mohs) 

800

Young's Modulus 

102.7 <100>  GPa

Shear Modulus 

67 GPa <100> nbsp]

Bulk Modulus  

77.2 GPa

Fracture Modulus 

110 MPa

Elastic Coefficient 

C11 = 129; C12 = 48.3; C44 = 67.1 GPa

Dielectric Constant

16.6 @f = 9.37 GHz

Solubility in Water 

insoluble  

Crystal Structure  

single crystal, synthetic

Crystal Type  

cubic, diamond structure, a = 5.62 Å  

Cleavage Planes 

(111), not perfect 

Poisson Ratio  

0.2

Application  

lenses, band pass filters, thermography, ATR Crystals, IR optics

Remarks  

relatively inert, DLC Coating possible, max. Temp. 100°C 

Remarkable 
  • Very high refractive index and reflectivity
  • Application as an ATR crystal in the field of IR spectroscopy
  • Relatively stable both chemically and mechanically
  • Diamond like coatings (DLC) increase the transmission and also the chemical and mechanical resistance
  • Maximum application temperature at approx. 80 ° C
NOTE: Despite careful research, we do not accept any liability for the correctness of the information provided. Liability claims based on the use of the information are excluded in principle.

Germanium: Korth Kristalle - Vom Rohkristall zur hochpräzisen Optik. Durchblick für alle Wellenlängen - Seit 72 Jahren züchten wir Kristalle und fertigen daraus hochpräzise optische Komponenten für alle Wellenlängen vom IR- bis zum VUV-Bereich. Unsere Produkte kommen in allen Bereichen zum Einsatz, in denen eine hochentwickelte, präzise technische Ausstattung unerlässlich ist – von der Analytik bis hin zur Medizin- und Raumfahrttechnik.

Contact/Inquiry

Korth Kristalle

Am Jägersberg 3
24161 Altenholz

+49 (0)431 - 36 90 50
+49 (0)431 - 36 90 525

info@korth.de


Contact

Remarkable

  • Very high refractive index and reflectivity
  • Application as an ATR crystal in the field of IR spectroscopy
  • Relatively stable both chemically and mechanically
  • Diamond like coatings (DLC) increase the transmission and also the chemical and mechanical resistance
  • Maximum application temperature at approx. 80 ° C