Robellaz et Cie S.A. Robellaz et Cie S.A.

Presentation
Production
Application
Watch jewels
Industrial stones
Nozzles
Materials and Properties
Ruby-sapphire Properties
Ceramic Properties
Map


Robellaz & Cie SA
2, Rue de France
CH-1450 Sainte-Croix
Tél. +41 (0)24 454 27 28
Fax +41 (0)24 454 32 26

NewsContact  FR  EN

Ruby-sapphire Technical Properties
Synthetic sapphire Al2O3
Synthetic ruby Al2O3 + Cr2O3
 
Physical properties
Mechanical properties
Thermal properties
Chemical properties
Electrical properties
Optical properties
Materials

 

Physical properties
Crystal structure rhombohedral hexagonal single crystal
Composition Al2O3
Purity 99.99%
Principal impurities Na2O, Si, Ca, Fe, Ga, Mg,
Ti, Mn, Pb, Cu, Zn, Ni
Cleavage conchoidal
Density 3.99 - 3.98
Density of dislocations 109 - 108/m2
 
 

Mechanical properties
Hardness Mohs 9 Knoop 2200 face // C axis
Knoop 1800 face ^ C axis
Modulus of elasticity 4.4·1011 Pa at 300 K
Modulus of rupture 4.0·108 Pa at 300 K
Compressive strength 2.1·109 Pa at 300 K
Tensile strength 1.9·108 Pa at 300 K
Poisson's ratio 0.3  
 
 

Thermal properties
Melting point 2320 K
Fusion point 2070 K
Specific heat 7.5 x 102 J/kg·K at 300 K
Thermal conductivity 40 W/m·K ^ at 300 K
Thermal dilatation 6.2·10-6/K // C axis
5.4·10-6/K ^ C axis
 
 

Chemical properties
Acid and alkali corrosion 0 to 570 K
Porosity 0
 
 

Electrical properties
Dielectric constant 10.6 electric field // C axis à 300 K
8.6 electric field ^ C axis à 300 K
Electrical resistivity 109 Ω·m at 770 K
104 Ω·m at 1270
10 Ω·m at 2270 K
 
 

Optical properties
Refractive index nD at 0.5893 μm 1.760 face // C axis
1.769 face ^ C axis
Chromatic dispersion (nF - nC) 0.011 λF=0.4861 μm
λC=0.6563 μm
Transmission visible excellent
Transmission infrared 85% 0.75 - 5 μm
70% 5.5 μm
50% 6 μm
Transmission ultraviolet 80% 0.4 - 0.3 μm
60% 0.28 μm
50% 0.2 μm
disk thickness 1 μm

Copyright © Robellaz et Cie S.A., All Rights Reserved
Réalisation WebCreation-Industry.com (eCore 0.3) | Admin