Sapphire (Al2O3)
Category: IR Crystal  Publish Time: 2016-03-03 08:51 

Sapphire (Al2O3)
Sapphire (Al2O3) single crystal is a kind of excellent multifunctional materials.It has high temperature resistance,

Sapphire (Al2O3) single crystal is a kind of excellent multifunctional materials.It has high temperature resistance, good thermal conductivity, high hardness,infrared transmittance and good chemistry stability.can be widely used in industry, national defense and scientific research fields (such as resistance to high temperature infrared window, etc.).


Physical Properties of Sapphire
Crystal Structure Hexagonal.   a =4.758 Å   c= 12.992 Å
Crystallographic D spacing

(1120 ) - a plane:  2.379Å                

(1102) - r plane:  1.740 Å

 

(1010) - m plane: 1.375 Å                

(1123) - n plane: 1.147 ů

 

(0001) - c plane:   2.165 Å                

(1011) - s plane:  1.961 Å

Crystal Purity > 99.99%
Melt Point 2040 oC        
Density 3.98  g/cm3  
Hardness 9 ( mohs)
Thermal Expansion  7.5  (x10-6oC)
Specific Heat 0.10  ( cal / oC)
Thermal Conductivity,

46.06 @ 0 oC     25.12 @ 100 oC,     

12.56 @ 400 oC        ( W/(m.K) )

Dielectric Constant ~ 9.4 @300K  at A axis    ~ 11.58@ 300K at C axis
Loss Tangent at 10 GHz < 2x10-5  at A axis ,       <5 x10-5  at C axis


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