Zinc Selenide Properties


Zinc Selenide Properties

Transmission
Optical Properties
10% transmission limits (t=6mm)
0.5 - 22µm
Index of refraction inhomogenity (n/n)
  (ppm @ 0.6328µm) < 3
Thermo-optic coefficient, dn/dT(298-358K)
  (1/K @ 0.6328µm) 1.07 x 10-4
  (1/K @ 1.15µm) 7 x 10-5
  (1/K @ 3.39µm) 6.2 x 10-5
  (1/K @ 10.6µm) 6.1 x 10-5
Bulk absorption coefficient
  (1/cm @ 1.3µm) 5.0 x 10-3
  (1/cm @ 2.7µm) 7.0 x 10-4
  (1/cm @ 3.8µm) 4.0 x 10-4
  (1/cm @ 5.25µm) 4.0 x 10-4
  (1/K @ 10.6µm) 5.0 x 10-4
Physical Properties
Crystal Structure
cubic
Grain size diameter 50 - 70 µm
Density diameter 50 - 70 µm
Grain size (g cm-3 @ 298K) 5.27
Resistivity -cm ~1012
Chemical purity (%) 99.9996
Thermal Properties
Coefficient of Thermal Expansion
  (1/K @273 K) 7.1 x 10-6
  (1/K @373 K) 7.8 x 10-6
  (1/K @473 K) 8.3 x 10-6
Thermal conductivity
  (J/K-m-s @ 298 K) 18.0
Heat Capacity (J/g-K @ 298 K) 0.339
Maximum operating temperature will depend on the environment.
Mechanical Properties
Hardness
Knoop, 50 gm load (kg mm-2) 110
  Vickers, 1 kg load (kg mm-2) 112
Flexural strength (modulus of rupure)
  4 pt. loading (psi) 8.0 x 103
  4 pt. loading (MPa) 55
Fracture toughness (critical stress intensity factor, KIC values)
  (MPa√m, Vickers, 100g) 0.5
Young's Modulus (elastic modulus)
  (psi) 9.75 x 106
  (GPa) 67.2
Poisson's ratio
0.28
Rain erosion resistance will depend on the environment.

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