CVD Zinc Sulfide (CVD ZnS)
ZnS grown by chemical vapor desposition (CVD) at the exceptional fracture strength and hardness leading to its frequent choice for harsh environments.This material is often used in the 8 to 12 microns region.ZnS has a lower cost relative to ZnSe and ZnS MS, and has potential wherever a tough and strong IR transmitting material is required.Advanced Materials’ CVD ZnS is chemically inert, non-hygroscopic, highly pure,theoretically dense, and easily machined.
Optical
Transmission Range
1-14.0 μm
Mechanical
Young's Modulus
74.5 GPa(10.8 x 105 psi)
Bulk Absorption
<= 0.24 cm-1@ 10.6μm
Rupture Modulus
103.4 MPa (15,000 psi)
Coefficient
Knoop Hardness
210-240 kg/mm2
Temp.Change of
41 x 10-6/°C
Properties
Poisson's
0.27
Properties
Refractive Index
@ 10.6μm
Ratio
Refractive Index
< 100 x 10-5
Physical
Chemical purity
99.9996%
Non-homogeneity
@ 10.6μm
Melting Point
1830.0 oC
Thermal
ThermalConductivity
0.167W/cm/°C @ 20°C
Density
4.09 g/cm3
Specific Heat
0.469 J/g/°C
Properties
Resistivity
≈1012Ωcm
Properties
Linear Expansion
6.8 x 10-6/°C@ 20°C
Crystal
cubic
Coefficient
structure
Indices of Refraction (n) of CVD Zinc Sulfide
as a function of wavelength at room temperature (20°C)
| Wavelength | n | Wavelength | n | Wavelength | n | Wavelength | n |
| (μm) | (μm) | (μm) | (μm) | ||||
| 0.4047 | 2.54515 | 0.6678 | 2.34033 | 1.5296 | 2.27191 | 9.0000 | 2.21290 |
| 0.4358 | 2.48918 | 0.7065 | 2.33073 | 2.0581 | 2.26442 | 10.0000 | 2.20084 |
| 0.4678 | 2.44915 | 0.7800 | 2.31669 | 3.000 | 2.25772 | 11.250 | 2.18317 |
| 0.4800 | 2.43961 | 0.7948 | 2.31438 | 3.500 | 2.25498 | 12.000 | 2.17101 |
| 0.5086 | 2.41279 | 0.8521 | 2.30659 | 4.000 | 2.25231 | 13.000 | 2.15252 |
| 0.5461 | 2.38838 | 0.8943 | 2.30183 | 4.5000 | 2.24955 | - | - |
| 0.5876 | 2.36789 | 1.0140 | 2.29165 | 5.0000 | 2.24661 | - | - |
| 0.6438 | 2.34731 | 1.1287 | 2.28485 | 8.000 | 2.22334 | - | - |
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