Lithium Niobate Wafers Free of Pyro-Electric Effect
- High ability to neutralise electrical charges. Black Lithium Niobate wafers neutralise electrical charges even if the electrical potential occurs instantaneously
- Black Lithium Niobate shows no difference in piezoelectric properties from standard wafers
- High uniformity of Bulk Resistivity throughout the surface and depth of wafers
Typical properties of Black Lithium Niobate
| Black Lithium Niobate | Standard Lithium Niobate | |
|---|---|---|
| Bulk Resistivity (Ω · cm) | 2.40E+11 |
3.80E+14 |
| Bulk Conductivity (&Omega-1; · cm-1) | 4.17E-11 |
2.63E-15 |
| Surface Electric Potential(Note 1) /100mmφ(kV) | <0.05 |
3.05 |
| Electrical Charge neutralisation (sec) | 1.5 |
∞ |
| Optical Transmission%(Note 2) | <60 |
73 |
| Colour | Dark Grey |
Colourless |
(1) Electrical charges due to temperature rising above room temperature to 95°C, at 4 inch LT wafer
(2) Transmission of 0.35mm thickness wafer (with both sides mirror polished) measured by 365nm wavelength
SAW Properties
| Lithium Niobate 127.86 ° Y-cut | ||
|---|---|---|
Black |
Standard |
|
| Curie temperature Tc (°C) | 1132±2 |
1132±2 |
| SAW velocity | Unchanged |
3980 (note 4) |
| Coupling coefficient k2 | Unchanged |
5.5 |
(4) Surface Acoustic Wave
Comparisons for Lithium niobate Material
| Comparison of electrical potential between black lithium tantalate and standard lithium tantalate when placed on a hotplate at 95°C |  |
|
| Black Lithium Tantalate - Endurance Test against High Temperature |  |
|
| Black Lithium Tantalate - Optical Transmission Spectra |  |
Specification of Bulk Resistivity
| Standard Black | |
|---|---|
| Bulk Resistivity (Ω · cm) | 1.00E+10˜ 9.99E+10 |
| Bulk Conductivity (Ω · cm-1) | 1.00E-10˜ 1.00E-11 |
Typical Specifications
| Orientation | Diameter | Thickness | Surface Finish | |
|---|---|---|---|---|
(+) plane |
(-) plane |
|||
| 41 ° Y-cut | 76.2(mm) 100.0(mm) |
0.25(mm) 0.35(mm) 0.50(mm) |
Mirror Polished |
GC#1000 GC#1200 GC#2500 |
| 64 ° Y-cut | ||||
| 127.86 ° Y-cut | ||||
In addition to the above, we can apply our de-oxidation treatment to Lithium Niobate wafers of any specification.