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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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