Silicon Dioxide
SiO2, known as silica, is a chemical compound that can be found in the nature as sand or quartz.
Silicon Dioxide Specifications
| Shape | Color | Purity | Package | Storage | ||
|---|---|---|---|---|---|---|
| Crystal | Granule | 1-3 mm; 3-5 mm | Colorless Transparent | 99.9% 99.95% 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
| Pillar | e.g.: 2×4 mm | |||||
| Cutting piece | e.g.: 20×10 mm | |||||
Characteristics of silicon dioxide
| CAS Number | Density (g/cm3) | Boiling point (Cº) | Melting point (Cº) | Refractive index at 550 (nm) | Transparency range (µm) | Evaporation source |
|---|---|---|---|---|---|---|
| 7631-86-9 | 2.2 | 2950 | 1700 | 1.45-1.46 | 0.2-9 | E |
| Applications | AR coating: Cold light coating; Filter; Insulating coating; Glass coating; UV coating | |||||
Evaporation technique
Electron beam evaporation works well for optical SiO2 because of its refractive index and it is evaporated from a graphite or tantalum crucible liner. Films result to be smooth and amorphous with good adhesion.
Silicon monoxide
SiO is an amorphous solid, available in many forms. It is a highly desirable coating material due to its high deposition rate and ease of evaporation using low cost resistance-heated coating systems.
Specifications
| Shape | Color | Purity | Package | Storage | ||
|---|---|---|---|---|---|---|
| Sinter | Blocky | 1-40 mm Upon demand | Black | 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
| Granule | 1-3 mm; 3-5 mm | |||||
| Cuboid piece | 100x100x50 mm | |||||
| Tablet | 28×10 mm, 18×10 mm | |||||
Characteristics of silicon monoxide
| CAS Number | Density (g/cm3) | Boiling point (Cº) | Melting point (Cº) | Refractive index at 550 (nm) | Transparency range (µm) | Evaporation source |
|---|---|---|---|---|---|---|
| 10097-28-6 | 2.13 | 1880 | 1700 | 1.8-1.9 | 0.4-9 | B (Ta, Mo, W) |
| Applications | Cold light coating; Decorative coating; Protective coating | |||||
Evaporation technique
Resistance heating in baffle boats is the most common evaporation method used, but electron beam evaporation may also be used, particularly with tablets.