FOR ENQUIRIES
+44(0) 1202 307650
Designed and manufactured in the UK

Quartz Crystal (SiO2)

♦ Quartz Crystal (SiO2) Data Sheet    ♦ Quartz Crystal (SiO2) MSDS   ♦ Quartz Crystal (SiO2) Guide

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.

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 : -5.5 x 10-6/°K (para) & -6.5 x 10-6/°K (perp) @ 633nm (3) (4)
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 (1) (2)
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)

To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.

Click to access current Quartz Crystal Stock Windows

µm   NoNeµm   NoNeµm   NoNe
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

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. See our guide on distinguishing the types.

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