|
Major capability parameter | |
|
Growth method |
hydro-thermal method |
|
Crystal Structure |
M6 |
|
Unit cell constant |
a=4.914Å c=5.405 Å |
|
Melt point（℃） |
1610℃ |
|
Density |
2.684g/cm3 |
|
Hardness |
7（mohs） |
|
Thermal conductivity |
0.0033cal/cm℃ |
|
Planned constant |
1200uv/℃（300℃） |
|
Index of refraction |
1.544 |
|
Thermal expansion |
α11：13.71×106 / ℃ α33：7.48×106 /℃ |
|
Frequency constant |
1661（kHz/mm） |
|
Crystal orientation |
Y、X or Z，30º~42.75 º ±5 |
|
Polishing |
Single or double Ra<10Å |
|
Thickness |
0.5mm±0.05mm TTV<5um |
|
Diameter |
Φ2″(50.8mm)、Φ3″(76.2mm)、Φ4″(100mm)±0.2mm main positioning：22±1.5mm (Φ3″) 32±3.0 (Φ4″) Secondary positioning ：10mm±1.5mm |