Zinc Sulfide

Title: Zinc Sulfide
CAS Registry Number: 1314-98-3
Additional Names: Zinc Blende
Molecular Formula: SZn
Molecular Weight: 97.47
Percent Composition: S 32.90%, Zn 67.11%
Line Formula: ZnS
Properties: Occurs in nature as the minerals wurtzite (hexagonal, d 4.087) and sphalerite (cubic, d 4.102). White to grayish-white or yellowish powder. When contg water, it slowly oxidizes in air to sulfate. Insol in water, alkalies. Sol in dil mineral acids. Precipitated zinc sulfide of commerce usually contains 15-20% water of hydration. The dried precipitate may have been heated to 725° in the absence of air to obtain substantial conversion to wurtzite, the form preferred by the pigment industry.
Density: d 4.087; d 4.102
Use: Pigment for paints, oilcloths, linoleum, leather, dental rubber, etc., especially in the form of lithopone; mixed with ZnO as "mineral white." Anhydr zinc sulfide is used in x-ray screens and with a trace of a radium or mesothorium salt in luminous dials of watches; also television screens.
Zinc Tannate Zinc Tartrate Zinc Telluride Zinc Thiocyanate Zinc Valerate

Zinc sulfide
Sphalerite, the more common polymorph of zinc sulfide
Wurtzite, the less common polymorph of zinc sulfide
Identifiers
CAS number 1314-98-3 YesY
PubChem 14821
RTECS number ZH5400000
Properties
Molecular formula ZnS
Molar mass 97.474 g/mol
Density 4.090 g/cm3
Melting point 1185 °C (sublime)
Solubility in water negligible
Band gap 3.54 eV (cubic, 300 K)
3.91 eV (hexagonal, 300 K)
Structure
Crystal structure see text
Coordination
geometry
Tetrahedral (Zn2+)
Tetrahedral (S2−)
Thermochemistry
Std enthalpy of
formation ΔfHo298
−204.6 kJ/mol
Hazards
MSDS ICSC 1627
EU Index Not listed
NFPA 704
NFPA 704.svg
0
1
0
Flash point Non-flammable
Related compounds
Other anions Zinc oxide
Zinc selenide
Zinc telluride
Other cations Cadmium sulfide
Mercury sulfide
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite. Although this mineral is usually black because of various impurities, the pure material is white, and it is widely used as a pigment. In its dense synthetic form, zinc sulfide can be transparent, and it is used as a window for visible optics and infrared optics.