Aluminium Oxide

Aluminium Aluminium Aluminium
Aluminium oxid: Al2O3-Cr,
Al2O3-Flux, Al2O3-Cr Flux
Aluminium oxid: Al2O3 Korundum
and Ruby - Crystals
Aluminium oxid: Al2O3 : Cr
Ruby rod
 
Aluminium Aluminium  
Aluminium oxid Al2O3 Aluminium oxid Al2O3  
 
Aluminium Aluminium

 

Crystal properties

Crystal growth method

Czochralski, HEM,Verneuil

Crystal growth orientation

(0 001),(1102),(1012),(1010)

Maximum size

7 inch diameter

Variations

Doped crystals (Fe, Nb, Ti, W,Ta,V,Cr)
Other dopands on request 

Crystallographic properties

Hexagonal / Rhombohedric

Crystallographic structure

a = 4.77 A
c = 13.04 A
a : c = 1 : 2.734

a =   4.758 Å
c = 12.991 Å

Mineralogical synonyms

 Sapphire, Corundum

Twinning structure

Twinfree

Colour

 Colourless

Density

3.98 g/cm3

Melting point

2052  °C

Hardnes

9   (Mohs)

Thermal  expansion coefficient

5.4 * 10_6 K_1 
6.2 * 10_6 K_1

|| c-axis
^ c-axis 

RT
RT

Dielectric  constant

9.4
11.5

| c-axis
^ c-axis

RT
RT

 

Physical properties cont.

Dielectric loss tangent (10GHz)

Aluminium

3.0 * 10_5
8.6 * 10_5

| | c-axis
^ c-axis

RT
RT

Dielectric constant:

1016 W/cm

RT

 

Optical properties

Transmission range

0.2 to 6.0 mm

 

Refraction index:

nd = 1.8336 
nd = 1.58638 

at 265 nm
 at 5.6 mm

Dispersion

 0.011

 

 

Standard orientations

Aluminium

(0001),(1102),(1012),(1010)

Other orientations on request

 

List of  Refractive index, ordinary ray at 24 °C (Al2O3)

Optical properties  refraction index Aluminium oxide

Wavelength (µm)

Refractive index 

0,28035

1,8243

0,289036

1,8195

0,29673

1,8159

0,30215

1,8135

0,31300

1,8091

0,33415

1,8018

0,34662

1,7981

0,36105

1,7945

0,36501

1,7936

0,39064

1,7883

0,40466

1,7858

0,43583

1,7812

0,54607

1,7708

0,57696

1,7688

0,57907

1,7687

0,64385

1,7655

0,70652

1,7630

0,85212

1,7588

0,89440

1,7579

1,01398

1,7555

1,12866

1,7534

1,36728

1,7494

1,39506

1,7489

1,52952

1,7466

1,69320

1,7437

1,70913

1,7434

1.81307

1,7414

1.97010

1,7383

2,15260

1,7344

2,24929

1,7323

2,32542

1,7306

2,43740

1,7278

3,24320

1,7044

3,26660

1,7036

3,30300

1,7023

3,29300

1,7015

3,41880

1,6982

3,50780

1,6950

3,70000

1,6875

4,25800

1,6637

4,95400

1,6266

5,14560

1,6151

5,34900

1,6020

5,41900

1,5973

5,577

1,5864