Zinc Sulphide (Zinc Sulfide) Multispectral (ZnS)

Zinc Sulphide (ZnS) SDS
Zinc Sulphide Multispectral (ZnS) Data Sheet

ZnS Multispectral (water-clear) is used for IR windows and lenses in the thermal band (8 to 14 μm) where maximum transmission and lowest absorption is required. Also selected for use where visible alignment is an advantage.

ZnS MS Visible transmission data ©2020. Open source with acknowledgement to Crystran Ltd.

ZnS MS IR Transmission data ©2020. Open source with acknowledgement to Crystran Ltd.

Products

Windows

 

Transmission Range
0.37 to 13.5 μm
Refractive Index
2.20084 at 10 μm (1)
Reflection Loss
24.7% at 10μm (2 surfaces)
Absorption Coefficient
0.2 cm-1 @ 10.6 μm
 
0.006 cm-1 @ 9.27 μm
 
0.0006 cm-1 @ 3.8 μm
 
0.0001 cm-1 @ 2.7 μm
 
0.0006 cm-1 @ 1.3 μm
Reststrahlen Peak
30.5 μm
dn/dT
+38.7 x 10-6 /°C at 3.39 μm
dn/dμ = 0
n/a
Density
4.09 g/cc
Melting Point
1827°C (see References & Notes)
Thermal Conductivity
27.2 W m-1 K-1 @ 298 K
Thermal Expansion
6.5 x 10-6/°C @ 273 K
Hardness
Knoop 240 with 50g indenter
Specific Heat Capacity
515 J Kg-1 K-1
Dielectric Constant
88
Youngs Modulus (E)
74.5 GPa
Shear Modulus (G)
n/a
Bulk Modulus (K)
n/a
Elastic Coefficients
C11 = 89.2 C12 = 40.0 C44 = 25.4 (2)
Apparent Elastic Limit
26.9 MPa (3900psi) (4)
Poisson Ratio
0.28
Solubility
65 x 10-6 g/100g water
Molecular Weight
97.43
Class/Structure
HIP polycrystalline cubic, ZnS, F42m

Click to access current Zinc Sulphide Guide to Cutting

µm No
0.4047 2.54515
0.4358 2.48918
0.4678 2.44915
0.4800 2.43691
0.5086 2.41279
0.5461 2.38838
0.5476 2.36789
0.6438 2.34731
0.6678 2.34033
0.7065 2.33073
0.7800 2.31669
0.7948 2.31438
µm No
0.8521 2.30659
0.8943 2.30183
1.0140 2.29165
1.1287 2.28485
1.5296 2.27191
2.0581 2.26442
3.000 2.25772
3.500 2.25498
4.000 2.25231
4.500 2.24955
5.000 2.24661
8.000 2.22334
µm No
9.000 2.21290
10.00 2.20084
11.25 2.18317
12.00 2.17101
13.00 2.15252
   
   
   
   
   
   
   

Zinc Sulphide is produced by synthesis from Zinc vapour and H2S gas, forming as sheets on Graphite susceptors. Zinc Sulphide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Multispectral grade is then Hot Isostatically Pressed (HIP) to improve the mid IR transmission and produce the visibly clear form. Single crystal ZnS is available, but is not common.

Zinc Sulphide oxidizes significantly at 300°C, exhibits plastic deformation at about 500°C and dissociates about 700°C. For safety, Zinc Sulphide windows should not be used above 250°C in normal atmosphere.

References:

(1) Refractive Index of Zinc Sulfide in the 0.405 - 13µm range. Mary Debenham (NPL) Applied Optics / Vol 23, No 14 / July 1984

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