Korth Kristalle GmbH

Refractive Index


Zinc Sulphide (ZnS)

Properties (ZnS)   
Transmission Range (50% of total transmission)  0,38 - 14 µm (thickness 2 mm )  
Refractive Index   2,351415@633 nm 
Reflective Loss   14% @10 µm  
Reststrahlen   30.5 µm  
Density   4.09 g/cm3  
Melting Point   sublimation >500°C 
Molecular Weight   97.43  
Thermal_Conductivity   27,2 W/(m·K) @298K  
Heat Capacity   519,15 J/(kg·K)  
Thermal Expansion   6,5 · 10-6 /K @208...473K  
Hardness (Mohs)   160 (Indenter load: 50g)  
Young`s Modulus   87,6 GPa  
Shear Modulus   33 GPa 
Bulk Modulus   80,41 GPa 
Rupture Modulus   68,9 MPa  
Elastic Coefficient   C11 = 102; C12 = 64,6; C44 = 44,6 GPa  
Dielectric Constant   8,393 @ (low frequency)  
Solubility in Water   unsoluble 
Crystal Structure l   polycrystalline, synthetic, grain size < 200 µm  
Crystal Type  cubic Sphalerit type structure, a = 5,42 Å  
Cleavage Planes   no cleavage  
Poisson Ratio   0,3  
Application   IR optics, FLIR (Forward Looking Infrared) Systems, 2 qualities (FLIR, ms)  
Remarks   more resistant than ZnSe, max. temperature for application: 300°C, reacts in combination with intense oxidizing agents and some acids, CVD grown plates.  

Transmission spectrum


Transmission spectrum-2


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