Titanium Dioxide (Rutile) TiO2
Titanium dioxide (TiO2)exists in three crystal polymorphs as natural minerals: Anatase, Brookite, and Rutile. Among these, Rutile has the most stable crystal structure, and due to its excellent optical properties and chemical stability, it is utilized in various advanced fields.
Characteristics
| Composition | TiO2 |
|---|---|
| Crystal system | Tetragonal |
| Crystal structure | Rutile |
| Lattice constant | a=0.45935 nm, c=0.29580 nm |
| Melting point | 1840 ℃ |
| Growth method | Verneuil method |
| Density | 4.252 g/cm3(20 ℃) |
| Dielectric constant | 113 (1 MHz) |
| Thermal expansion coefficient (30～400℃) | (a-axis) 7.81×10-6/℃ , (c-axis) 10.1×10-6/℃ |
| Band gap | 3.0 eV |
| Refractive index (at 706.5 nm) | no=2.5490, ne=2.8226 |
Standard Specs
| Type | TiO2 | Nb(0.05 wt%) :TiO2 Nb=0.04 at% | Nb(0.5 wt%) :TiO2 Nb=0.43 at% |
|---|---|---|---|
| Purity | >99.98 % | >99.98 % | >99.98 % |
| Resistivity (Ω・cm) | >107 | 約5×100 | 約3×10-1 |
| Orientation (Tolerance：±0.5 °) | (100) (110) (001) |
(100) (110) (001) |
(100) (110) (001) |
| Size (Outer size tolerance: ±0.1 mm / Thickness tolerance: ±0.05 mm) | 10×10×0.5t 15×15×0.5t |
10×10×0.5t 15×15×0.5t |
10×10×0.5t 15×15×0.5t |
| Polishing | One-side / Both-side | One-side / Both-side | One-side / Both-side |
| Surface roughness | Ra≦1.0nm Rmax≦5.0nm |
Ra≦1.0nm Rmax≦5.0nm |
Ra≦1.0nm Rmax≦5.0nm |
| Flatness (λ=632.8 nm) |
10×10×0.5 t :≦λ 15×15×0.5 t : ≦1.5λ |
10×10×0.5 t :≦λ 15×15×0.5 t : ≦1.5λ |
10×10×0.5 t :≦λ 15×15×0.5 t : ≦1.5λ |