Yttrium-Aluminium-Garnet Ceramic, Transparent Description
The transparent Yttrium-Aluminium-Garnet ceramic is uncoated and exhibits a light transmittance of over 80%. Yttrium-Aluminium-Garnet is a synthetic crystalline material belonging to the garnet group. It constitutes a cubic phase of yttrium aluminium oxide; other examples include YAlO₃ in a hexagonal or orthorhombic perovskite-type form and the monoclinic Y₄Al₂O₉.
Transparent ceramics refer to polycrystalline materials with a defined level of light transmittance, produced by ceramic processing and also referred to as optical ceramics. In comparison to optical materials derived from glass or resin, transparent ceramics are stronger, harder, more resistant to corrosion and better able to withstand high temperatures. They are employed under severe conditions.
Transparent Yttrium-Aluminium-Garnet Ceramic Specifications
Property
|
YAG
|
Y2O3
|
ALON
|
Bulk Density (g/cm³)
|
4.55
|
5.03
|
3.72
|
Flexural Strength (MPa)
|
300
|
200
|
300
|
Fracture Toughness (MPa)
|
2
|
2.5
|
1.4
|
Elastic Modulus (GPa)
|
234
|
164
|
317
|
Poisson's Ratio
|
0.23
|
0.29
|
0.24
|
Vickers Hardness (GPa)
|
13.4
|
11
|
16
|
Thermal Conductivity (W/m·K)
|
12
|
14
|
12.6
|
CTE, 25~1000°C
|
8×10-6
|
6~7×10-6
|
5.83×10-6
|
Grain Size (µm)
|
0.25~6
|
0.25~8
|
0.25~5
|
Maximum Light Transmittance
|
84%
|
81%
|
80.20%
|
Refractive Index at 1000 nm
|
1.82
|
1.95
|
1.79
|
Dielectric Constant
|
10.8 (1MHz)
|
11.8
|
9.9 (1MHz)
|
Dielectric Loss
|
5×10-4
|
5×10-4
|
<5×10-4
|
Melting Point (°C)
|
1 950
|
2 430
|
2 165
|
Applications of Transparent Yttrium-Aluminium-Garnet Ceramic
The transparent Yttrium-Aluminium-Garnet ceramic is employed for the following purposes:
- Lenses
- Windows
- Laser Components
- Scintillators