Zinc Sulfide (ZnS)

ZnS grown by chemical vapor desposition (CVD) at II-VI 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 the material properties of being a tough and strong IR transmitting material.

Optical Properties

Optical Properties
 
Bulk Absorption Coefficient @ 10.6µm
<= 0.24 cm-1
Temperature Change of Refractive Index @ 10.6µm 41 x 10-6/°C
Refractive Index Inhomogeneity @ 10.6µm
< 100 x 10-6

Thermal Properties

Thermal Properties
 
Thermal Conductivity @ 20° C
0.167 W/cm/°C
Specific Heat
0.469 J/g/°C
Linear Expansion Coefficient @ 20° C
6.8 x10-6/°C

Mechanical Properties

Mechanical Properties
 
Young’s Modulus
74.5 GPa (10.8 x 106 psi)
Rupture Modulus
103.4 MPa (15,000 psi)
Knoop Hardness
210-240 kg/mm2
Density
4.08 g/cm3
Poisson’s Ratio
0.27

 

Wavelength
(µm)
Index
Wavelength
(µm)
Index
Index
Wavelength
(µm)
Index
0.42
2.516
1.0
2.292
2.232
13.0
2.152
0.46
2.458
1.4
2.275
2.228
13.4
2.143
0.50
2.419
1.8
2.267
2.225
13.8
2.135
0.54
2.391
2.2
2.263
2.221
14.2
2.126
0.58
2.371
2.6
2.260
2.217
14.6
2.116
0.62
2.355
3.0
2.257
2.212
15.0
2.106
0.66
2.342
3.4
2.255
2.208
15.4
2.095
0.70
2.332
3.8
2.253
2.203
15.8
2.084
0.74
2.323
4.2
2.251
2.198
16.2
2.072
0.78
2.316
4.6
2.248
2.192
16.6
2.059
0.82
2.310
5.0
2.246
2.186
17.0
2.045
0.86
2.305
5.4
2.244
2.180
17.4
2.030
0.90
2.301
5.8
2.241
2.173
17.8
2.015
0.94
2.297
6.2
2.238
2.167
18.2
1.998
0.98
2.294
6.6
2.235
2.159
 
 

Optical Materials

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