Quartz Crystal (SiO2)

Optically, Crystalline Quartz is used extensively as a wave retardation medium. The birefringent properties of Quartz are of use in quarter-wave plates and in polarisers. Quartz should not be processed or used at temperatures greater than 490 °C

Crystalline quartz is also used for electronic filters and resonators. However, Crystran Ltd. does not deal in material for this application.
 
Product Data -----------------------------------------------------
 
Transmission Range : 0.18 to 3.5 μm (also >40  μm)
Refractive Index : No 1.54421; Ne 1.55333 at 0.6 μm
Reflection Loss : 8.8% at 0.6 μm (2 surfaces)
Absorption Coefficient : n/a
Reststrahlen Peak : n/a
dn/dT : +5 x 10-6/°C
dn/dμ = 0 : 1.3 μm
Density : 2.649 g/cc
Melting Point : 1710 °C
Thermal Conductivity : 10.7 (para) 6.2 (perp) W m-1 K-1 at 323 K
Thermal Expansion : 7.1 (para) 13.2 (perp) x 10-6/°C
Hardness : Knoop 741 with 500g indenter
Specific Heat Capacity : 710 J Kg-1 K-1
Dielectric Constant : 4.34 (para) 4.27 (perp) at 30MHz
Youngs Modulus (E) : 97.2 (para) 76.5 (perp) GPa
Shear Modulus (G) : 31.14 GPa
Bulk Modulus (K) : 36.4 GPa
Elastic Coefficients : C11=87 C12=7 C44=58 C13=13 C14=(-)18 C33=106
Apparent Elastic Limit : 41MPa (5950psi)
Poisson Ratio : n/a
Solubility : Insoluble in water
Molecular Weight : 60.06
Class/Structure : Trigonal (hex) P3(2)21 (RH) and P3(1)21 (LH)
 
Refractive Index and Optical Transmittance curve----
Refractive Index(No=Ordinary Ray):
µm    No Ne µm    No Ne µm    No Ne
0.193    1.661 1.675 0.213    1.632 1.645 0.222    1.622 1.634
0.226    1.619 1.630 0.248    1.602 1.613 0.257    1.596 1.607
0.280    1.585 1.596 0.308    1.576 1.586 0.325    1.571 1.581
0.351    1.565 1.575 0.400    1.558 1.567 0.458    1.552 1.561
0.488    1.550 1.559 0.515    1.548 1.557 0.532    1.547 1.556
0.590    1.544 1.553 0.633    1.543 1.552 0.670    1.541 1.551
0.694    1.541 1.550 0.755    1.539 1.548 0.780    1.539 1.548
0.800    1.538 1.547 0.820    1.538 1.547 0.860    1.537 1.547
0.980    1.535 1.546 1.064    1.534 1.543 1.320    1.531 1.539
1.550    1.528 1.536 2.010    1.521 1.529
Optical Transmittance Curve of SiO2 (Reference Data):
quartz-crystal-sio2 Transmittance
 
Special properties of Quartz---------------------------------

Typeical application:Astronomical,Thermal Imaging

Products manufactured:Lenses, Windows, Wedges, Prism, Waveplates, Filters.

Surface finish:Qartz as sames BK-7 polishes extremely well and polishes of 10-5, or 20-10 scratch-dig are achieved at extra costs respectively, mainly for UV and visible applications.

Surface figure:Surface figure of 1/10 wave to 1/4 wave @0.6328μm are specified mostly on lenses for ultraviolet and visible use.

AR coating options:AR @ 0.8-2.5μm, AR @ 1.064, AR @ Visible W.L.
Product Notes:------------ --------------------------------------

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.

Normal Quartz is Alpha Quartz and normally RH rotating. LH rotating is available on special order.

At temperatures >490°C, Crystal Quartz starts to revert to glassy state, a process which is complete by 530°C. At this time, as annealling is unlikely, fracture of component is probable.

REFERENCES:
(1)J.V.Atansoff and P.J.Hart, Phys. Rev. Vol.59, pp 85-96 1941
(2)A.W.Lawson, Phys. Rev. Vol 59, pp.838-839, 1941 .

Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, ultiQuest Technology accept no responsibility for accuracy of data

 Contact
If you have any questions or comments, please contact us by filling-in the mail form.

 
Copyright 1999-2011 Ultiquest Technology Ltd. | Privacy Policy | Terms of Use | Web Mail Site Credits