Characteristics and uses of zinc sulfide
Zinc sulphide is white to off-white or light yellow powder. See the light colour becomes darker. Stable in dry air, gradually oxidized to zinc sulphate when placed in moist air for a long time or containing moisture. Soluble in dilute mineral acid, soluble in alkali, insoluble in water. The relative density is 3.98 (α-type), (d25) 4.102 (β-type). Irritating.
The research of zinc sulphide fluorescent materials was discovered by French chemist Sidot in 1868 for more than 130 years. The research on zinc sulphide materials has been attracting people's attention in the 1920s and 1940s.
The research of zinc sulphide fluorescent materials was discovered by French chemist Sidot in 1868 for more than 130 years. The research on zinc sulphide materials has been attracting people's attention in the 1920s and 1940s.
Physical properties
White or light yellow powder. When it is burned in H2S gas, it turns into a crystal. The alpha variant is colourless hexagonal crystals with a density of 3.98 g / cm3 and a melting point of 1700 ± 28 ° C (202.66 kPa--20 atm); the beta variant is colourless cubic crystals with a density of 4.102g / cm3 and converted to Alpha type. Exist in sphalerite.
Chemical properties
Insoluble in water, easily soluble in acid. See the sun darken. It will be converted into zinc sulphate in humid air for a long time. It is generally obtained by the action of hydrogen sulphide and zinc salt solution. If a small amount of Cu, Mn, Ag is added to the crystal ZnS as an activator, after illuminating, it can emit different colours of fluorescence. Used as analytical reagents, paints, paints, white and opaque glass, filled with rubber, plastic, and used to prepare phosphors. It is made by sulphur and zinc co-heating.
B-type zinc sulfide is 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 sulphate in the air. The crystal transition temperature is 1020 ° C.
use
As an essential two-six compound semiconductor, zinc sulphide nanomaterials have attracted considerable attention, not only because of its excellent physical properties, such as wide bandgap, high refractive index, high light transmittance in the visible light range, and Its huge potential applies to optical, electronic and optoelectronic devices. Zinc sulphide has excellent fluorescence effect and electroluminescence function. Nano-zinc sulphide has a unique photoelectric impact. It exhibits many excellent properties in the fields of electricity, magnetism, optics, mechanics and catalysis. More attention has been paid to it, especially in 1994 Bhargava reported that the surface passivation nano ZnS: Mn phosphor not only has an external quantum efficiency of up to 18% at high temperature, its fluorescence life is shortened by five orders of magnitude, but also emits light The performance has changed a lot. It has opened up a new way for the application of ZnS in materials. It can be used to make white pigments and glass, luminescent powder, rubber, plastic, luminous paint, etc.
Trunnano is one of the world's largest producers of zinc sulphide nanomaterials, as well as various sulphide nanoproducts. If you want to know about sulphide nanoproducts, please contact Dr Leo, email: brad@ihpa.net.
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