Material - Crystal Quartz (SiO2)
Optically, crystalline quartz is used extensively as a wave retardation medium, using the birefringent properties for use in quarter-wave plates and in polarizers. Quartz is mined naturally, but more commonly produced synthetically in large long faceted crystals. Quartz is positive birefringent. Be careful not to confuse terminology in this material, as "fused quartz" is often used to denote the glassy non-crystalline form better known as silica.
Optical Quality Cultured Crystalline Quartz is available in three grades defined by optical absorption at two wavelength: 190 nm and 2800 nm (a - index of absorption, 1/cm).
BASE PROPERTIES
|
PARAMETER |
|
VALUE |
|
|
|
|
|
|
| OPTICAL |
|
| |
Transmission Range |
|
0.4 - 4.5 µm |
|
| |
Reflection Loss |
|
at 2.05 µm (2 surfaces)
for o-ray – 8.3%; for e-ray – 8.5%; |
|
| |
|
|
|
|
| PHYSICAL |
|
| |
Density |
|
2.635-2.660 g/cm3 at 289 K |
|
| |
Melting Temperature |
|
1740 °C |
|
| |
Debye Temperature |
|
470 K |
|
| |
Thermal Conductivity
|
|
|
|
| |
at 20 K (parallel/perpendicular) |
|
720/370 W/(m K) |
|
| |
at 194 K (parallel/perpendicular) |
|
20/10W/(m K) |
|
| |
at 323 K (parallel/perpendicular) |
|
10.7/6.2W/(m K) |
|
| |
Thermal Expansion |
|
|
|
| |
parallel |
|
8.0 x 10-61/K at 273-253 K |
|
| |
perpendicular |
|
13.4 x 10-6 1/K at 273-253 K |
|
| |
Knoop Hardness |
|
741 kg/mm2 |
|
| |
Specific Heat |
|
0.17 cal/(g K) at 273 K |
|
| |
Dielectric Constant
for 3x107 Hz at 295 K |
|
|
|
| |
parallel |
|
4.27 |
|
| |
perpendicular |
|
4.34 |
|
| |
Young's Modulus |
|
15.85 GPa |
|
| |
parallel |
|
97.2 |
|
| |
perpendicular |
|
76.5 |
|
| |
Shear Modulus |
|
31.14 GPa |
|
| |
Bulk Modulus |
|
36.4 GPa |
|
| CHEMICAL |
|
| |
Solubility in water |
|
none |
|
| |
Molecular Weight |
|
60.06 |
|
| |
Crystal Class |
|
Hexagonal |
|
REFRACTIVE INDEX
|
Wavelength, µm |
|
Refractive Index, no |
|
Refractive Index, ne |
|
|
|
|
|
|
|
|
|
|
| |
0.185 |
|
1.65751 |
|
1.68988 |
|
| |
0.198 |
|
1.65087 |
|
1.66394 |
|
| |
0.231 |
|
1.61395 |
|
1.62555 |
|
| |
0.340 |
|
1.56747 |
|
1.57737 |
|
| |
0.394 |
|
1.55846 |
|
1.56805 |
|
| |
0.434 |
|
1.55396 |
|
1.56339 |
|
| |
0.508 |
|
1.54822 |
|
1.55746 |
|
| |
0.5893 |
|
1.54424 |
|
1.55335 |
|
| |
0.768 |
|
1.53903 |
|
1.54794 |
|
| |
0.8325 |
|
1.53773 |
|
1.54661 |
|
| |
0.9914 |
|
1.53514 |
|
1.54392 |
|
| |
1.1592 |
|
1.53283 |
|
1.54152 |
|
| |
1.3070 |
|
1.53090 |
|
1.53951 |
|
| |
1.3958 |
|
1.52977 |
|
1.53832 |
|
| |
1.4792 |
|
1.52865 |
|
1.53716 |
|
| |
1.5414 |
|
1.52781 |
|
1.53630 |
|
| |
1.6815 |
|
1.52583 |
|
11.53422 |
|
| |
0.486 |
|
1.6678 |
|
1.4907 |
|
| |
1.7614 |
|
1.52468 |
|
1.53301 |
|
| |
1.9457 |
|
1.52184 |
|
1.53004 |
|
| |
2.0531 |
|
1.52005 |
|
1.52823 |
|
| |
2.30 |
|
1.51561 |
|
|
|
| |
2.60 |
|
1.50986 |
|
|
|
| |
3.00 |
|
1.49953 |
|
|
|
| |
3.50 |
|
1.48451 |
|
|
|
| |
4.00 |
|
1.46617 |
|
|
|
| |
4.20 |
|
1.4569 |
|
|
|
| |
5.00 |
|
1.417 |
|
|
|
| |
6.45 |
|
1.274 |
|
|
|
| |
7.00 |
|
1.167 |
|
|
|
| |
|
|
|
|
|
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