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| Nickel sulfate hexahydrate Potassium nickel hexahydrate |
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Nickel sulfate hexahydate (NSH) grown from acqueous solution is adopted as one kind of materials for commercial ultra-violet(UV) filters. Potassium nickel sulfate hexahydrate(KNSH), a new type crystal of better thermo-stability served as well as NSH does. |
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NSH crystals for UV filters |
Optical spectra of NSH crystal |
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KNSH crystals for UV filters |
Optical spectra of KNSH crystal |
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Structure |
Tetragonal |
Monoclinic |
Cell Parameters |
a =6.782 ?
b= 6.782 ?
c=18.274 ? |
a =6.125 ?
b= 12.159 ?
c=8.980 ? |
Density |
2.08 g/cm3 |
2.25 g/cm3 |
Optical homogeneity |
dn ? 10-6/cm |
dn ? 10-6/cm |
Transparent region |
200-330nm |
220-330nm |
Hygroscopic susceptibility |
--- |
Low |
Thermal-stability |
<70°C |
<95°C |
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Specifications
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better than 20 arc seconds
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| *Ø25mm,Ø50mm filters are mounted between sealed glass windows |
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