Aluminium Oxide
![]() Aluminium Oxide: Al2O3-Cr, Al2O3-Flux, Al2O3:Cr Flux |
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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 |
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Crystallographic properties | Hexagonal / Rhombohedric | |||
Crystallographic structure |
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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 |
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Dielectric constant | 9.4 11.5 |
| c-axis ^ c-axis |
RT RT |
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Physical properties cont. | ||||
Dielectric loss tangent (10GHz)![]() |
3.0 * 10_5 8.6 * 10_5 |
| | c-axis ^ c-axis |
RT RT |
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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 |
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Dispersion | 0.011 | |||
Standard orientations | ||||
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(0001),(1102),(1012),(1010) Other orientations on request | |||
List of Refractive index, ordinary ray at 24°C (Al2O3) |
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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 |
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