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Titanium Dioxide
TiO2 is the chemical compound with the highest refractive index in the visible range. Films deposited from titanium oxides starting compositions are of the composition TiO2.
Specifications of TiO2
| Type | Shape | Size | Color | Purity | Package | Storage |
|---|---|---|---|---|---|---|
| Sinter | Tablet | 8×5 mm 9×5 mm 10×5 mm Upon demand | White Black | 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
| Sinter | Granule | 1-3 mm; 3-5 mm | White Black | 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
Characteristics of titanium dioxide
| CAS Number | Density (g/cm3) | Boiling point (Cº) | Melting point (Cº) | Refractive index at 550 (nm) | Transparency range (µm) | Evaporation source |
|---|---|---|---|---|---|---|
| 13463-67-7 | 4.29 | 2200 | 1843 | 2.3 | 0.36-9 | RE,RS |
| Applications: | AR coating; Beam splitter; Cold light filter; HR coating; Glasses coating | |||||
Titanium dioxide Evaporation technique
Titanium dioxide can be thermally evaporated from a tungsten or Mo-boat. To ensure an acceptable level of outgassing, pressure should be monitored. Titanium dioxide can also be deposited reactively by electron beam evaporation from a Cu-crucible with Mo-liner or from Mo-boats. It melts completely.
Trititanium pentoxide
Ti3O5, described as Ti(IV)-Ti(III), is a semiconductor produced by reduction of TiO2 with hydrogen at high temperatures. It is less outgassing than TiO2 during preparation of the melt. It is then faster the preparation to achieve stable conditions before the start of the evaporation process, and there is less risk of spattering.
Specifications of Ti3O5
| Shape | Color | Purity | Package | Storage | ||
|---|---|---|---|---|---|---|
| Crystal | Granule | 1-3 mm 3-5 mm | Purple black | 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
| Sinter | Tablet | 10×5 mm Upon demand | Tea black | 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
Characteristics of trititanium pentoxide
| CAS Number | Density (g/cm3) | Boiling point (Cº) | Melting point (Cº) | Refractive index at 550 (nm) | Transparency range (µm) | Evaporation source |
|---|---|---|---|---|---|---|
| 12065-65-5 | 4.89 | 1500-2000 | 1700 | 2.2-2.3 | 0.4-8 | RE,RS |
| Applications | AR coating; Beam splitter; Cold light filter; HR coating; Glasses coating | |||||
Evaporation technique for Ti3O5
Trititanium pentoxide can be evaporated from a tungsten boat and it melts without spattering and evaporates smoothly. A Mo-liner can also be employed. Due to its low thermal conductivity of this liner, it is easier to melt the material with less e-beam power before reaching evaporation temperature.
Titanium sesquioxide
Ti2O3, called titanium sesquioxide, is prepared by reacting titanium dioxide with titanium metal at 1600oC.
Specifications for titanium sesquioxide
| Shape | Color | Purity | Package | Storage | ||
|---|---|---|---|---|---|---|
| Sinter | Tablet | 9×5 mm Upon demand | Purple | 99.99% | 1 Kg/Bag | Avoid exposure to sunlight & acid Keep dry |
| Granule | 1-3 mm | |||||
Characteristics of titanium sesquioxide
| CAS Number | Density (g/cm3) | Boiling point (Cº) | Melting point (Cº) | Refractive index at 550 (nm) | Transparency range (µm) | Evaporation source |
|---|---|---|---|---|---|---|
| 1344-54-3 | 4.49 | 1900 | 2130 | 1.9-2.3 | 0.4-12 | RE,RS |
| Applications | AR coating; Beam splitter; Cold light filter; HR coating; Glasses coating | |||||
Evaporation technique for Ti2O3
Ti2O3 is evaporated reactively by electron beam. Its advantage over TiO2 is that no oxygen is released during the melting process, so the risk of spattering is reduced.