High temperature resistance, good thermal conductivity, high
hardness, sapphire ingot
Product Description
Sapphire (Sapphire, molecular formula Al2O3) single crystal is an
excellent multifunctional material. It has high temperature
resistance, good thermal conductivity, high hardness, infrared
transmission and good chemical stability. At the same time, it is
also a widely used single crystal substrate material, and it is the
substrate of choice for the current blue, violet, and white light
emitting diode (LED) and blue laser (LD) industries.
Technical Specification
| Crystal Structure | Hexagonal. a =4.758 c= 12.992 |
| Crystallographic D spacing | (1120 ) - a plane: 2.379 (1102) - r plane: 1.740 |
| (1010) - m plane: 1.375 (1123) - n plane: 1.147 ˉ |
| (0001) - c plane: 2.165 (1011) - s plane: 1.961 |
| Crystal Purity | > 99.99% |
| Melt Point | 2040 oC |
| Density | 3.98 g/cm3 |
| Hardness | 9 ( mohs) |
| Thermal Expansion | 7.5 (x10-6/ oC) |
| Specific Heat | 0.10 ( cal / oC) |
| Thermal Conductivity, | 46.06 @ 0 oC 25.12 @ 100 oC, 12.56 @ 400 oC ( W/(m.K) ) |
| Dielectric Constant | ~ 9.4 @300K at A axis ~ 11.58@ 300K at C axis |
| Loss Tangent at 10 GHz | < 2x10-5 at A axis , <5 x10-5 at C axis |
| Standard Products |
| As - grown boules | 3" dia x 50 ~ 70 mm length |
| ori.± 0.5o | 2" dia x 50 ~ 70 mm length |
| 30 mm dia x 150 mm length |
| As-cut blanks | 2" dia x 0.7 mm thickness |
| ori.± 0.5o | 1" dia x 0.7 mm thickness |
| Epi -polished substrates | 3" dia. x 0.5 mm |
| C, R, A plane: ori.± 0.5o | 2" dia. x 0.33 mm, 2"dia x 0.5 mm |
| 1 or 2 sides polished | 1" dia x 0.5 mm |
| Ra< 10 | 0.5" x 0.5" x 0.5 mm |
| 10x10x0.5 mm |
Application field
In the field of optical communication, sapphire crystal is used not
only as a short-wavelength active device, but also as a polarizer
for passive devices;
In the field of laser, sapphire is an excellent laser dielectric
material (such as Ti:Al2O3, Cr:Al2O3);
in the field of superconductivity, sapphire crystal can not only
make Y-series, La-series high-temperature superconducting films,
but also grow new practical MgB2 High-temperature superconducting
thin films (usually single crystal substrates are chemically
corroded during the production of MgB2 thin films);
An important window material widely used in high-energy detection
and high-power high-power lasers.
