Sapphire

(

Al2O3

)
Eigenschaften 
Transmission Range

0.16 - 4.7 µm

Refractive Index

no=1.766/ne=1.758 @633nm

Reflection Loss 

6.94% @2.9 µm (1 surface)

Residual Beam Wavelength  

13.5 µm

Density  

3.99 g/cm3

Melting point  

2053 °C

Molecular Weight 

101.9613

Thermal Conductivity  

|| C: 35.1perp. C 33 @300K

Spec. Heat Capacity  

753 J/(kg·K)

Thermal Expansion  

perp. C 5 || C 5.6 · 10-6/ K @293K

Hardness (Mohs) 

|| C: 1900 perp. C 2200

Young's Modulus 

400 GPa

Shear Modulus 

145 GPa

Bulk Modulus  

207 GPa

Fracture Modulus 

1200 MPa

Elastic Coefficient 

C11= 495; C12=160; C33= 497; C44= 146; C13= 115; C14= 23 GPa

Dielectric Constant

|| C 10.55; perp. C8.6

Solubility in Water 

unsoluble

Crystal Structure  

hexagonal,  a = 4.785 Å  c = 12.991 Å

Crystal Type  

Single crystal, synthetic 

Cleavage Planes 

no cleavage

Application  

IR optics, laser optics, pressure optics

Remarks  

esistant against solvents, most acids and bases

Remarkable 
  • Mechanically, chemically and thermally very resistant
  • A good thermal conductivity
  • Low thermal expansion
  • Max. size of crystals diameter >500 mm
  • A good electrical insulation
  • Thermal shock resistant
  • Shows high resistance to solarization effects when exposed to radiation
  • High compressive and flexural strength
  • High laser resistance
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.

Sapphire: 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

  • Mechanically, chemically and thermally very resistant
  • A good thermal conductivity
  • Low thermal expansion
  • Max. size of crystals diameter >500 mm
  • A good electrical insulation
  • Thermal shock resistant
  • Shows high resistance to solarization effects when exposed to radiation
  • High compressive and flexural strength
  • High laser resistance