Aluminium Oxide: Al2O3-Cr, Al2O3-Flux, Al2O3:Cr Flux

 

	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)	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
		(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