• Sapphire ( single crystal of Al₂O₃ ) is being used extensively as a substrate for III-V nitrides and for many other epitaxial films 
• Wafer size: 1" dia x 0.5 mm thickness 
• (0001) C plane orientation ( +-0.5^o) with Standard Flat
• Polished surface: two sides epi polished by special CMP technology
• Surface roughness: Ra < 5 A ( by AFM)
• Package: Each wafer is packed in 1000 class clean room with 100 grade plastic bag with wafer container 

Typical Properties:

• Crystal Structure: Hexagonal. a=4.758 Angstroms c=12.99 Angstroms
• Melting Point: 2040 degree C
• Density: 3.97 gram/cm² 
• Growth Technique: CZ
• Crystal Purity:  >99.99%
• Hardness: 9 ( mohs)
• Thermal Expansion: 7.5x10^{-6 (}/ ^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

 Please click here for detail data

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