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 sapphire protector glass for the screen of mobile phone


Sapphire(Al2O3) is consists of 3 oxygen atoms and 2 aluminium atoms by covalent bond, it is hexagonal lattice structure. Sapphire possesses unique properties of excellent optical, mechanical, chemical stability with high intensity, high hardness.
It is able to work under the temperature of 2000 centigrade, which is applied in infrared military devices, high intensity laser lens and photo-mask material. The unique lattice structure, mechanical and thermal property makes sapphire the major material for photoelectric devices. Usually, sapphire substrate is used for growing GaN based material and device epitaxial layer. Sapphire substrate has several advantages, first, growth technology is mature, device performs well, second, high stability enables the use under high-temperature growth, at last, it can be processed and cleaned easily because of its high mechanical intensity, which is the reason why it is applied as substrate in many process.

Properties of sapphire crystal

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