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ZnSe (Zinc Selenide)

ZnSe is used widely for IR components, windows and lenses, and for spectroscopic ATR prisms. Zinc Selenide is one of the materials of choice for CO2 laser optics operating at 10.6 microns.


 Physical and optical properties  

Transmission Range : 0.6 to 21.0 μm
Refractive Index : 2.4028 at 10.6 μm
Reflection Loss : 29.1% at 10.6 μm (2 surfaces)
Absorption Coefficient : 0.0005 cm-1 at 10.6 μm
Reststrahlen Peak : 45.7 μm
dn/dT : +61 x 10-6/°C at 10.6 μm at 298K
dn/dμ = 0 : 5.5 μm
Density : 5.27 g/cc
Melting Point : 1525°C (see notes below)
Thermal Conductivity : 18 W m-1 K-1 at 298K
Thermal Expansion : 7.1 x 10-6 /°C at 273K
Hardness : Knoop 120 with 50g indenter
Specific Heat Capacity : 339 J Kg-1 K-1
Dielectric Constant : n/a
Youngs Modulus (E) : 67.2 GPa
Shear Modulus (G) : n/a
Bulk Modulus (K) : 40 GPa
Elastic Coefficients : Not Available
Apparent Elastic Limit : 55.1 MPa (8000 psi)
Poisson Ratio : 0.28
Solubility : 0.001g/100g water
Molecular Weight : 144.33
Class/Structure : HIP polycrystalline cubic, ZnS, F43m

 

No = Ordinary Ray

µm
No
µm
No
µm
No
0.54
2.6754
0.58
2.6312
0.62
2.5994
0.66
2.5755
0.7
2.5568
0.74
2.5418
0.78
2.5295
0.82
2.5193
0.86
2.5107
0.90
2.5034
0.94
2.4971
0.98
2.4916
1.0
2.4892
1.4
2.4609
1.8
2.4496
2.2
2.4437
2.6
2.4401
3.0
2.4376
3.4
2.4356
3.8
2.4339
4.2
2.4324
4.6
2.4309
5.0
2.4295
5.4
2.4281
5.8
2.4266
6.2
2.4251
6.6
2.4235
7.0
2.4218
7.4
2.4201
7.8
2.4183
8.2
2.4163
8.6
2.4143
9.0
2.4122
9.4
2.4100
9.8
2.4077
10.2
2.4053
10.6
2.4028
11.0
2.4001
11.4
2.3974
11.8
2.3945
12.2
2.3915
12.6
2.3883
13.0
2.3850
13.4
2.3816
13.8
2.3781
14.2
2.3744
14.6
2.3705
15.0
2.3665
15.4
2.3623
15.8
2.3579
16.2
2.3534
16.6
2.3487
17.0
2.3438
17.4
2.3387
17.8
2.3333
18.2
2.3278
 
 


Zinc Selenide is produced by synthesis from Zinc vapour and H2Se gas, forming as sheets on Graphite susceptors. Zinc Selenide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Single crystal ZnSe is available, but is not common but has been reported as having lower absorption and thus more effective for CO2 optics.   

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

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