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    寶石材料
    
     
     
    
     
    
	
      
    Sapphire is a single crystal aluminum oxide (Al2O3). Its Mohs hardness is 9, it is one of the hardest materials. Sapphire has good mechanical strength, and it is also transparent from visible to IR spectrum. So, it is always used as window material where scratch resistance is required.
          
    • Lattice Constant: a =4.75 A; c =12.97A
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    • Transparent Range: 180nm ~ 4500nm
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    • Density: 3.98g/cm3
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    • Mohs Hardness: 9
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    • Melting Point: 2030℃
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    • Thermal Conductivity: 0.04W/m/K
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    • Expansion Coefficient: 8.4x10-6/K
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    • Refractive Index: 1.755@1um
                
                         
        
     
     
    


    
    
    
    


    
    
    
    
    
    
     
    
      
     
    
      
      
    Sapphire Material

    

     
    
     
    
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