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    Sapphire crystal

    Sapphire crystal(Sapphire, also known as white stones,formula is AI203)has good thermal characteristics, Electrical characteristics and dielectric properties, and anti-chemical corrosion. High temperature, good thermal conductivity, high hardness, infrared transparent, good chemical stability. Widely used in high-temperature infrared window materials and group III-V nitride epitaxial thin film substrate material, to meet the growing blue, purple, white light-emitting diode (LED) and blue laser (LD) needs, Unionlight specializing in the production of high-quality, large-size sapphire crystal.

     

    Material nature

    Crystal structure

    Six-Party a=4.758 , i=12.992

    Crystal orientation

    (11-20)-a plane:2.379(1-102)-r plane:1.740
    (10-10)- m plane:1.375(11-23)-n plane:1.147
    (0001)-c plane:2.165(10-11)-s plane:1.961

    Single crystal purity

    >99.99%

    Melting point

    2040℃

     Density

    3.98g/cm3

    Hardness

    9(mohs)

    Coefficient of thermal expansion

    7.510-6/℃

    Heat capacity

    0.10(cal/℃)

    Thermal conductivity

    46.06@0℃25.12@100℃,12.56@400℃(W/(m.k))

    Permittivity

    ~9.4@300Kat A axis~11.58@300K at C axis

    Loss tangent

    <210-5at A axis,<510-5 at C axis