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Overview of Zinc Sulfide

wallpapers News 2021-07-29
Overview of Zinc Sulfide
The study of zinc sulfide fluorescent materials has a history of more than 130 years since it was discovered by the French chemist Sidot in 1868. From the 1920s to the 1940s, the study of zinc sulfide materials has always attracted people's attention.
Zinc Sulfide is white to off-white or light yellow powder. See the light darken. It is stable in dry air, and when it is placed in humid air for a long time or contains moisture, it will gradually oxidize to zinc sulfate. Soluble in dilute inorganic acid, soluble in alkali, insoluble in water. The relative density is 3.98 (α type), (d25) 4.102 (β type). It is irritating.
The Physical and Chemical Properties of Zinc Sulfide
White or slightly yellow powder. It turns into crystals when burning in H2S gas. The alpha variant is a colorless hexagonal crystal with a density of 3.98g/cm3 and a melting point of 1700±28°C (202.66 kPa-20 atmospheres); the beta variant is a colorless cubic crystal with a density of 4.102g/cm3, which is converted to at 1020°C α type. Exist in sphalerite.
Insoluble in water, soluble in acid. See the sunlight dimmed. It is converted into zinc sulfate in humid air for a long time. It is generally derived from the action of hydrogen sulfide and zinc salt solution. If a small amount of Cu, Mn, Ag is added as an activator in the crystalline ZnS, it can emit different colors of fluorescence after being illuminated. Used as analytical reagents, coatings, paints, white and opaque glass, filling rubber, plastics, and for preparing phosphors. It is made by co-heating sulfur and zinc. The relative density is 4.087.
The melting point is 1700°C.
Thermal conductivity 25.1w/(m·K),
Coefficient of thermal expansion (volume): 100°C, 0.163; 200°C, 0.395; 400°C, 0.919; 800°C, 2.146.
B-type zinc sulfide is a cubic crystal. White to off-white or yellow powder. The relative density is 4.102, and the melting point is 1700°C. Coefficient of thermal expansion (volume): 100°C, 0.156; 200°C, 0.386; 400°C, 0.898; 800°C, 1.996. It can be slowly oxidized to sulfate in the air. The crystal form transition temperature is 1020°C.
 
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