Sapphire crystals have a very high hardness, with a Mohs hardness of 9, second only to the hardest diamond. It has good light transmission, thermal conductivity and electrical insulation, good mechanical and mechanical properties, and has the characteristics of wear resistance and wind erosion resistance. The melting point of sapphire crystal is 2050℃, the boiling point is 3500℃, and the maximum working temperature can reach 1900℃.
As an important technical crystal, sapphire crystal has been widely used in many fields of science and technology, national defense and civil industry, and electronic technology.
Such as infrared transparent window materials, substrate substrates in the field of microelectronics, laser substrates, optical components and other uses, etc.
Sapphire crystal properties
|Crystal properties of sapphire|
|Crystalline structure||Hexagonal lattice|
|Lattice constant||a =4.758A,c=12.991A|
|Purity of single crystal||> 99.999%|
|Mohs hardness||9 (second only to diamonds: 10)|
|Melting point||2040 °C|
|Boiling point||3000 °C|
|Coefficient of thermal expansion||8.8x10-6/K|
|Specific heat||0.418 W.s/g/k|
|Heat capacity||77 J/mol.K|
|25.12 W/m/k ( @ 100°C )|
|Refractive index||no=1.768 ne=1.760|
|dn/dt||13x10-6 /K ( @633nm )|
|Light transmission characteristics||T«80% ( 0.3 ~ 5pm)|
|Dielectric constant||11.5( lie), 9.3 ( ±c)|
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