Sapphire Crystal

Sapphire crystals have very stable chemical properties. They are generally insoluble in water and are not corroded by acids and alkalis. They can only be corroded by hydrofluoric acid, phosphoric acid and molten potassium hydroxide at higher temperatures (300°C).

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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
Chemical  formulaAI2O3
Space groupR3c
Crystalline structureHexagonal lattice
Lattice constanta =4.758A,c=12.991A
Purity of single crystal> 99.999%
Density3.95-4.1 g/cm3
Mohs hardness9 (second only to diamonds: 10)
Bending  strength895MPa

Melting point2040 °C
Boiling point3000 °C
Coefficient of thermal expansion8.8x10-6/K
Specific heat0.418 W.s/g/k
Heat capacity77 J/mol.K

25.12 W/m/k ( @ 100°C )
Refractive indexno=1.768 ne=1.760
dn/dt13x10-6 /K ( @633nm )
Light transmission characteristicsT«80% ( 0.3 ~ 5pm)
Dielectric constant11.5( lie), 9.3 ( ±c)
Poisson's ratio0.27-0.29

Sapphire crystal

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