Zinc Sulfide ZnS Pulver: Physicochemical Characteristics
The covalent chemical bond between Zn sulfide and S of zinc is more common. Three types of crystal are available: Low-temperature type, which is the sphalerite crystal that is found abundantly in nature, and colorless cubic crystal. The Zn S coordination number is 4 and the relative density is 4.10. It will transition to high-temperature at 1020. It is a high-temperature zinc sulfide stable structure. The sodium chloride type, which is Zn, S number are 6, has a relative density of 5.21. The aqueous compound ZnS*H2O also exists, which is a white powder having a relative density of 3.98 with a melting point 1049. Zinc sulfuride is insoluble and insoluble with water and dilute acid. It is also insoluble and insoluble when acetic acids are present. However, it can be soluble in low concentrations in strong acids, such as hydrochloric, which releases hydrogen sulfide. The solubility of zinc sulfide resembles the K1*K2 value for hydrosulphuric Acid, so there is the following equilibrium in dilute acid.
It is clear that zinc sulfide can not be precipitated in the acidic zinc sodium solution. When hydrogen sulfide gases is added to zinc salt solution, zinc sulfide precipitation may be possible, but it is not complete. Ammonium sulfide can be used as a precipitant to precipitate zinc ions from zinc salt solution. The alkaline nature of ammonium solution allows for the reduction in the acidity. This method is used to separate air in industry. When exposed to light, white zinc sulfide turns dark and can easily be oxidized to zinc oxide in air. Zinc sulfuride can be used in white paint pigments by itself or with zinc oxide. Pure zinc sulfide does not emit light. As activators, zinc sulfide crystals can emit different colors after light irradiation. Zinc sulfide has many uses in leather, dye, rubber and enamel as well as other industries.
Zinc sulfide It can be corrosive or poisonous. It can cause irritation to the skin. Operators should wear overcoats and protective gear. The workshop must be well ventilated.
|Zinc Sulfide ZnS Powder Properties|
|Other names||ZnS powder, zinc sulphide|
|Appearance||Powders ranging from off-white to white|
|Solubility of H2O||Insoluble|
Double decomposition method For double decomposition reactions, slowly add zinc sulfate solution under stirring. The reaction will produce zinc sulfide as well as ammonium-sulfate. After cooling crystallization, filtration will remove ammonium and then zinc sulfide.
Zinc Sulfide ZnS Pulver Applications
1. It can be used as an analytical reagent, phosphor matrix or photoconductor material. Or dyes coatings pigments glass and curing oil manufacturing.
2. Zinc sulfuride is used extensively in the manufacture of infrared fairings, windows, and optical elements. It has the following characteristics: high purity, insoluble when water is present, moderate density, and simple processing. Zinc sulfide exhibits good consistency and uniformity in terms of its refractive indices. It is able to transmit images in the 8-12mm band, but it can absorb some after 10um. The transmittance of the middle infrared bands is higher. Also, absorption and scattering are increased with the shorter wavelength. Zinc sulfide’s resistance to harsh environments is impressive. The high hardness and fracture strength of Zinc Selenide are double that of Zinc sulfide.
For zinc sulfide and other thermal imaging systems, these front optics are tough (8 to 14mm).
Although single-crystal zirconium sulfide may be available, it is rare. The scattering is low in the typical spectral range. It can be used to produce high-power laser devices, but it must be controlled for bulk absorption as well as internal structural defects. The polishing technology should have a low degree of damage.
Zinc sulfuride oxidizes at 300, shows plastic deformation at around 500, and separates at approximately 700. Zinc sulfide window should not exceed 250 degrees Celsius in normal atmospheric conditions.
3. It is used to make X-ray screens, Xray targets, the luminescent dials by adding a trace of radium salt or neothorium, and paint pigments.
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