English|中文
English|中文

Sapphire

Products > Infrared Optics > Sapphire
    • 1
    • 2

Sapphire

Sapphire has exceptional  physical (optical, mechanical, dielectric and thermal) and chemical  properties along with superior radiation stability. For this reason  sapphire is in high demand for many Scientific, Industrial and Military  applications.

Sapphire has orientations and the following picture shows the structure  of the primary planes of the sapphire crystal corresponding to the  structure system of sapphire. Shown in this Figure, the C– plane is  (0001), A– plane is (1120) and R– plane (1012).

There are many different methods for growing sapphire. The most common are:

Kyropoulos (HEM) method

Stepanov (EFG) method

Czochralski method

Bagdasarov (Horizontal directed crystallization) method

Verneuil method

Sapphire Physical properties

Crystal structure:

Chemical composition:

 

           

Al2O3

Molecular weight:

101.96

Crystal system:

Rhombohedral systems(R3c)

Lattice constant:

a=4.765A/c=13.001A*
            A=10 nm

Density (specific gravity):

3.98 g/cm3

Cleavability:

(1011), (1120), imperfect

 

 

           

Mechanical   properties:

Hardness:

[Mohs] 9(*Diamond=10, quartz=7)

[Knoop] 15.0 to 16.3GPa (perpendicular to the c axis)

16.4 to 19.6GPa (parallel to the c axis)

[Vickers] 2300

Young’s modulus:

34 to 37 GPa

Crushing strength:

2000 Mpa

Tensile strength:

2250 Mpa

Compression strength:

2950 Mpa

Bending strength:

450 to 690 Mpa

Destruction coefficient:

490 to 690 Mpa

Bulk modulus of elasticity:

250 GPa

Shearing modulus:

140 Gpa

 

 

           

Optical   Properties

Transmittance:


           

Refractive index:

 

           

1.83 at 0.26 mm
            1.76 at 0.63 mm
            1.58 at 5.57 mm

 JH  OPTEK can provide sapphire window, lens, prism, wafer and other  customized parts. The coating is available based on customer request as  well.



Previous： End
Next： Optical Grade sapphire windows
Return
TOP