Description
Name: Zinc Sulfide
Chemical formula: ZnS
Relative molecular mass:97.44
Traits
White to pale or pale yellow powder. See light color deepening. Steady in dry air, for a long time in the wet air or containing water, the gradual oxidation of zinc sulfate. Soluble in dilute inorganic acid, insoluble in water and alkaline solution. Relative density of 3.98 (α type), (d25) 4.102 (β type). Irritating.
store
Sealed dry and protected from light.
Use
Electronic vacuum coating. X-ray screen. Add trace amounts of radium or new thorium salt to the table for the luminous dial. TV screen. Paint the paint.
Index value of quality control information and quality control items
Quality control items / Item index value
| ZnS | ≥95.0% |
| Fe | ≤0.00002% |
| Cu | ≤0.00002% |
| Pb | ≤0.0001% |
| Ni | ≤0.00002% |
| H2O | ≤3.0% |
CVD zinc sulfide is a chemically inert material, with high purity, insoluble in water, moderate density, easy processing and other characteristics, widely used in infrared windows, fairing and infrared optical components production. As with zinc selenide (ZnSe), zinc sulfide (ZnS) is also a material with good refractive index uniformity and good consistency. It has good image transmission performance in the 8000nm-12000nm wave band, and the material is also higher in the middle infrared band , But as the wavelength becomes shorter, absorption and scattering are enhanced. Compared with zinc selenide (ZNSE), zinc sulfide is low in price, high in hardness, twice as fast as zinc selenide, and is resistant to harsh environments. It is very suitable for use in the manufacture of missile window and military aircraft infrared window
Transmittance curve
CVD ZINC SULFIDE Transmission
Wavelength in Micrometer
CLEARTRAN Transmission
Wavelength in Micrometers
Physicochemical property
| CVD Zinc sulfide | Multispectral CVD Zinc sulfide | |
| Density(g.cm-3@ 298k) | 4.09 | 4.09 |
| Specific resistance(Ω.Cm) | ~1012 | ~101.3 |
| Melting point(℃) | 1827 | |
| Chemical purity(%) | 99.9996 | 99.9996 |
| Coefficient of thermal expansion(1/k) | 6.6* 10-6@273k | 6.3* 10-6@273k |
| 7.3* 10-6@373k | 7.0* 10-6@373k | |
| Heat conductivity(J/k.m.s) | 16.7@298k | 27.2@298k |
| Calorific capacity(J/g.k) | 0.469@298k | 0.515@298k |
| knoop Hardness(kg/mm2) | 200-235 | 160 |
| Bending strength(Mpa) | 103 | |
| Young modulus(Gpa) | 74.5 | 74.5 |
| Poisson ratio | 0.29 | 0.28 |
Optical property
|
|
CVD Zinc sulfide |
Multispectral CVD Zinc sulfide |
| Wave length of transmittance scope |
1000nm—14000nm |
370nm—14000nm |
|
Inhomogeneity of refractive index（Δn/n） |
<7.3* 10-4@10600nm |
<0.2* 10-4@632.8nm |
|
Absorption coefficient(1/cm) |
0.2 @ 10600nm |
0.2 @10600nm |
|
Thermo-optical coeffecient dn/dt(1/k,298-358k) |
4.6* 10-5@1150nm |
5.43* 10-5@632.8nm |
|
4.3* 10-5@3390nm |
4.21* 10-5@1150nm |
|
|
4.1* 10-5@10600nm |
3.87* 10-5@3390nm |
Variation of refractive index with the wave length
(CVD Zinc sulfide ZNS)20℃
|
Wave length(nm) |
Refractive index(n) |
Wave length(nm) |
Refractive index(n) |
|
620 |
2.355 |
9800 |
2.203 |
|
1000 |
2.292 |
10600 |
2.192 |
|
3800 |
2.253 |
11400 |
2.180 |
|
5000 |
2.246 |
12200 |
2.167 |
|
7000 |
2.232 |
13800 |
2.132 |
|
9000 |
2.212 |
14200 |
2.126 |
Multispectral CVD Zinc sulfide(CLEARTRAN ZnS)20℃
|
Wave length(nm) |
Refractive index(n) |
Wave length(nm) |
Refractive index(n) |
|
400 |
2.545 |
8000 |
2.223 |
|
1010 |
2.292 |
9000 |
2.213 |
|
2060 |
2.264 |
10000 |
2.201 |
|
3500 |
2.255 |
11250 |
2.183 |
|
4500 |
2.250 |
12000 |
2.171 |
|
5000 |
2.247 |
13000 |
2.153 |
|
Technical requirements |
Tolerance zone | ||
| Range of sizes |
1-400mm |
||
| Dimensional tolerance |
+0/-0.05mm |
||
| Angle tolerance |
±2”-±5’´ |
||
| Surface quality |
40/20 |
||
| Surface accuracy |
λ/10 per @633nm |
||
|
Chamfering of edge |
0.1-0.5mm |
||
| Material | zinc sulfide | ||
| Coating film | 8-14 microns or 3-5 microns and other wave bands | ||
