Zinc Sulfide Overview and its properties

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Zinc Sulfide Zinc sulfide The chemical formula for ZnS is ZnS. The molar weight of this compound is 97.47 grams/mol. ZnS’s chemical structure is very simple. It consists of zinc metal attached through a polar, covalent bond to a sulfur. It is the most common form of zinc in nature. Sphalerite is its main mineral. This mineral, although usually black, is actually white. It is used in many pigments. In its dense, synthetic form, zinc sulfur can be transparent. This is why it’s used in optical windows for both visible and infrared light. Zinc Sulfide appears yellowish white powder in a fluid. It is not soluble in liquid water and is denser. The main hazard to the environment. To limit the spread in the environment, immediate action should be taken. It is easily absorbed by the soil, contaminating nearby groundwater and waterways.
There are two crystal forms of solid zinc sulfide, alpha and beta, which have hexagonal (wurtzite), respectively, and cubic (sphalerite) structures. Beta crystalline ZnS (sphalerite), the more stable, is found in beta crystalline form.
Zinc sulfide Occurrence:
Zinc sulfide It is found in nature as zinc blende (also called sphalerite), which is a mix of iron and Zinc sulfides. In nature, zinc dioxide is found in the form of “zincite”. In fluorescence light energy is absorbed then rapidly reemitted. The phosphorescence from zinc sulfide is visible after the UV light has been turned off.

Zinc sulfide Preparation:
Zinc Sulfide may be produced by simple reactions such as combustion of zinc and sulfur or reaction of zinc (ZnSO4) sulfate salt with sodium (Na2S). It can also be made by adding hydrogen sulfide to any aqueous Zn2+ solution in order for the ZnS to precipitate. The insoluble ZnS can be prepared by reacting the zinc oxide with hydrogen sulfur:
ZnO + H2S = ZnS plus H2O
Zinc Sulfide Physical Property:
Zinc Sulfide can be found in two distinct crystal forms. The wurtzite is white or yellowish crystals. While the sphalerite is greyish white. It has a mass density of 4.09 grams per mL and a melting temperature of 1,185 degrees C.
Zinc Sulfide Chemical Property:
Zinc Sulfide Is Insoluble in Water It breaks down in the presence strong acids and oxidizing agents. When heated to temperatures greater than 900 degrees Celsius, it releases sulfur and zinc fumes. It also reacts strongly acidic solutions, releasing hydrogen-sulfide. At 102 degrees Celsius, the beta-crystalline ZnS material (sphalerite), a stable form of ZnS, transforms into its alpha-crystalline form (wurtzite). ZnS is a luminous material that exhibits phosphorescence under UV light.
Zinc sulfide Uses:
Zinc Sulfide is used in many applications because of its luminescent quality. It is used to make electroluminescent and phosphorescent materials. Zinc Sulfide, also known as zinc sulfide, is used for optical lenses and windows, infrared optics, and as a pigment. It’s also a wide bandgap semiconductor, and an efficient photo catalyst.
The most common usage of ZnS As a pigment in paints, rubbers, plastics and other materials. Lithopone (a mixture of ZnS, barium, and sulfate) is widely used as a pigment in low-gloss enamels. ZnS can be used for a variety of electronic and decorative uses because it is phosphorescent.
Zinc sulfide hazards:
Zinc Sulfide exposure is not harmful to humans. It mainly causes irritations of the respiratory tract, skin and eyes. This is considered an environmental hazard because it is toxic for aquatic organisms.

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