Sapphire Jewel Tube

Physical Properties
Crystalline Structure Rhomboedral Hexagonal Single Crystal
Composition AI2O3
Purity 99.99%
Cleavage Conchoidal
Density 3.99-3.98 g/cm3
Disclosation Density 109-108/m2
Thermal Properties
Melting Point 2320K
Softening Point 2070K
Specific Heat 7.5*102 J/Kg*K at 300K
Thermal Conductivity 40W/m*K ┴ at 300K
Thermal Expansion 6.2*10-6/K// C-axis 5.4*10-6/K ┴ C-axis
Mechanical Properties
Hardness Mohs9 Knoop 2200 face // C-axis,knoop 1800 face ┴ C-axis
Youngs Modulus 4.4*1011 pa at 300K
Modulus of Rupture 4.0*108Pa at 300K
Compressive Strength 2.1*109Pa at 300K
Tensile Strength 1.9*108Pa at 300K
Poissons constant 0.30
Chemical Properties
Acids and alkalis attack 0 to 570K
Porosity 0
Electrical Properties
Dielectric Constant 10.6 electric field // C-axis at 300K,8.6 electric field ┴ C-axis at 300K
Electrical Resistivity 109Ω*m at 770K,104Ω*m at 1270,10Ω*m at 2270K
Optical Properties
Refractive Index nD at 0.5893μm 1760 face // C-axis , 1.769 face ┴ C-axis
Dispersive Power(nF-nC) 0.011 λf=0.4861μm,λc 0.6563μm
Transmission,Disc Thickness 1 mm
-Visible Light Excellent
-Infrared 85%0.75-5μm,70% 5.5μm,50% 6μm
-Ultraviolet 80%0.4-0.3μm,60% 0.28μm,50% 0.2μm

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