Al2O3 substrate

Al2O3 Substrate (Sapphire)

Al2O3 crystal or Sapphire is a multi-function crystal materials with excellent properties: good thermos-stability, high thermal conductivity, high hardness, high transmission at infrared wavelength rang and excellent chemical stability. Sapphire is widely used in industrial, defense and security and scientific research fields. sapphire is also an important substrate materials for high temperature superconductivity applications, it can be used for film growth of Y-series, La-series, and it is also used to grow the superconductivity film of MgB2.

Features

1 ) Good thermos-stability

2 ) High thermal conductivity

3 ) High hardness

Applications

1 ) High temperature superconductivity film

2 ) IR window

Specifications

Materials

Al2O3 (Sapphire)

Orientation

A-plane

<11-20>

R-plane

<1-102>

M-plane

<10-10>

C-plane

<0001>

Orientation Tolerance

±0.5°

Surface Finish

Single side polished (SSP) or Double sides polished (DSP)

Polished Side Roughness

< 0.5 nm

Typical Size

10 x 10 x 0.5 mm, φ50.8 x 0.5 mm, φ100 x 0.65 mm etc.

Dimension Tolerance

±0.1 mm or better

Thickness Tolerance

±0.05 mm or better

Maximum Size

Diameter 180 mm

Properties

Chemical Formula

Al2O3

Crystal Structure

M6

Lattice Parameters

a = 4.758 Å c =12.99 Å

Crystal Purity

> 99.99%

Melting Point

2040 ℃

Density

3.97 g/cm3

Hardness

9 Mohs

Thermal Expansion Coefficient (/ ℃)

7.5 × 10^-6

Thermal Conductivity (Calorie/℃ Cm.S)

 

⊥c

//c

23 ℃

0.055

26 ℃ 0.060

77 ℃

0.040

70 ℃ 0.041

Dielectric Constants

~ 9.4 @300K  at A axis

~ 11.58 @300K at C axis