Zinc Sulfide (ZnS)ZnS grown by chemical vapor desposition (CVD) at II-VI Infrared exhibits exceptional fracture strength and hardness leading to its frequent choice for military applications or other harsh environments. This material is often used in the 8 to 12 microns region. Its high resistance to rain erosion and high-speed dust and particulate abrasion makes it particularly suitable for exterior IR windows on aircraft frames.
ZnS has a lower cost relative to ZnSe and ZnS MS, and has potential wherever a tough and strong IR transmitting material is required.
ZnS Transmission GraphsMaterial Properties
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Optical Properties |
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Bulk Absorption Coefficient @ 10.6µm |
<= 0.24 cm-1 |
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Temperature Change of Refractive Index @ 10.6µm |
41 x 10-6/°C |
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Refractive Index Inhomogeneity @ 10.6µm |
< 100 x 10-6 |
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Thermal Properties |
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Thermal Conductivity @ 20° C |
0.167 W/cm/°C |
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Specific Heat |
0.469 J/g/°C |
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Linear Expansion Coefficient @ 20° C |
6.8 x10-6/°C |
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Mechanical Properties |
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Young’s Modulus |
74.5 GPa (10.8 x 106 psi) |
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Rupture Modulus |
103.4 MPa (15,000 psi) |
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Knoop Hardness |
210-240 kg/mm2 |
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Density |
4.08 g/cm3 |
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Poisson’s Ratio |
0.27 |
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Wavelength |
Index |
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Wavelength |
Index |
|
Wavelength |
Index |
|
Wavelength |
Index |
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0.42 |
2.516 |
|
1.0 |
2.292 |
|
7.0 |
2.232 |
|
13.0 |
2.152 |
|
0.46 |
2.458 |
|
1.4 |
2.275 |
|
7.4 |
2.228 |
|
13.4 |
2.143 |
|
0.50 |
2.419 |
|
1.8 |
2.267 |
|
7.8 |
2.225 |
|
13.8 |
2.135 |
|
0.54 |
2.391 |
|
2.2 |
2.263 |
|
8.2 |
2.221 |
|
14.2 |
2.126 |
|
0.58 |
2.371 |
|
2.6 |
2.260 |
|
8.6 |
2.217 |
|
14.6 |
2.116 |
|
0.62 |
2.355 |
|
3.0 |
2.257 |
|
9.0 |
2.212 |
|
15.0 |
2.106 |
|
0.66 |
2.342 |
|
3.4 |
2.255 |
|
9.4 |
2.208 |
|
15.4 |
2.095 |
|
0.70 |
2.332 |
|
3.8 |
2.253 |
|
9.8 |
2.203 |
|
15.8 |
2.084 |
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0.74 |
2.323 |
|
4.2 |
2.251 |
|
10.2 |
2.198 |
|
16.2 |
2.072 |
|
0.78 |
2.316 |
|
4.6 |
2.248 |
|
10.6 |
2.192 |
|
16.6 |
2.059 |
|
0.82 |
2.310 |
|
5.0 |
2.246 |
|
11.0 |
2.186 |
|
17.0 |
2.045 |
|
0.86 |
2.305 |
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5.4 |
2.244 |
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11.4 |
2.180 |
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17.4 |
2.030 |
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0.90 |
2.301 |
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5.8 |
2.241 |
|
11.8 |
2.173 |
|
17.8 |
2.015 |
|
0.94 |
2.297 |
|
6.2 |
2.238 |
|
12.2 |
2.167 |
|
18.2 |
1.998 |
|
0.98 |
2.294 |
|
6.6 |
2.235 |
|
12.6 |
2.159 |
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