Properties

Sapphire Physical properties

Competency Details

 

Product Description

  • Sapphire Physical properties
    Crystal structure:
    Chemical composition:
    Al2O3
    Molecular weight:
    101.96
    Crystal system:
    Rhombohedral systems(R3c)
    Lattice constant:
    a=4.765A/c=13.001A*
    A=10 nm
    Density (specific gravity):
    3.98 g/cm3
    Cleavability:
    (1011), (1120), imperfect
     
    Mechanical properties:
    Hardness:
    [Mohs] 9(*Diamond=10, quartz=7)
    [Knoop] 15.0 to 16.3GPa (perpendicular to the c axis)
    16.4 to 19.6GPa (parallel to the c axis)
    [Vickers] 2300
    Young’s modulus:
    34 to 37 GPa
    Crushing strength:
    2000 Mpa
    Tensile strength:
    2250 Mpa
    Compression strength:
    2950 Mpa
    Bending strength:
    450 to 690 Mpa
    Destruction coefficient:
    490 to 690 Mpa
    Bulk modulus of elasticity:
    250 GPa
    Shearing modulus:
    140 Gpa
     
    Optical Properties
    Transmittance:
    Refractive index:
    1.83 at 0.26 mm
    1.76 at 0.63 mm
    1.58 at 5.57 mm

     

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