ZnS Jan 8, 2008

Two grades of ZnS available for use in imaging systems.Regular grade material is grown by the chemical vapor deposition process. This material is often used in the 3um to 5 um and 8um to 12 um region. It has reasonable hardness and is moderately priced. It is available in large size as well. It can replace ZnSe in certain harsh environment. MultiSpectral grade ZnS is treated after growth to eliminate microscopic voids and defects which occur in the regular grade, thus extending the usefulness of this material to include the visible region.

MATERIAL PROPERTIES

Absorption Coefficient (10cm-1) 0.096 0.011
Refractive index 2.2002 2.2002
Temperature Coefficient of Refractive Index(10-6/ºC) 50 50
Thermal Conductivity (mcalcm-1S-1K-1) 40 40
Specific Heat (Cal/g.k.) 0.112 0.124
Thermal Expansion Coefficient (a x 10-6) 7.85 7.85
Young‘ Modulus (Gpa) 71.5 88
Rupture Modulus (Gpa) 103.4 68
Knoop Hardness (Kg/cm) 250 106
Density(g/cm3) 4.09 4.09

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