Zinc Sulfide Overview and its properties

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Zinc Sulfide Zinc sulfide The chemical formula for ZnS is ZnS. Its molar weight is 97.47g/mol. ZnS’s chemical structure is very simple. It consists of zinc metal bound to sulfur by a polar covalent link. It is found as the mineral, sphalerite. This mineral, although usually black due to impurities, is white and is widely used in pigments. In its dense, synthetic form, zinc sulfur can be transparent. This is why it’s used in optical windows for both visible and IR optics. Zinc Sulfide is yellowish white powder that appears in a liquid. 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.” Fluorescence occurs when 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 several simple methods, including the combustion or reaction of zinc and sulfur. Another method is to pass hydrogen sulfide into an aqueous solution with any Zn2+. 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 white crystals. While the sphalerite is greyish white. It has a mass density of 4.09g/mL and a melting temperature of 1.185 degC.
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 a temperature of about 102 degrees Celsius, the beta-crystalline ZnS material (sphalerite), a stable form, 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, as well infrared optic material. It’s also a wide bandgap semiconductor, and an effective photo catalyst.
The most common usage of ZnS As a pigment in paints, rubbers, and plastics. 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 a serious environment hazard because it is highly toxic for aquatic organisms.

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