Lithium Tantalate – Free of Pyro-Electric Discharge
- High ability to neutralise pyro-electric charges. Black Lithium Tantalate wafers neutralise electrical charges even if the electrical potential occurs instantaneously
- Black Lithium Tantalate shows no difference in piezoelectric properties from standard wafers
- High uniformity of Bulk Resistivity throughout the surface and depth of wafers
- Yellow (High physical strength) material now available
Typical properties of Black Lithium Tantalate
| Black Lithium Tantalate | Standard Lithium Tantalate | ||
|---|---|---|---|
| Bulk Resistivity (Ω · cm) | Standard Black 2.30E+11 |
Super Black 2.10E+10 |
4.50E+10 |
| Bulk Conductivity (&Omega-1; · cm-1) | 4.35E-12 | 4.76E-11 | 2.22E-15 |
| Surface Electric Potential (1) /100mmφ(kV) | <0.35 | <0.08 | 4.12 |
| Electrical Charge neutralisation (sec) | 3.5 | 1.5 | ∞ |
| Optical Transmission % (2) | 65 | <60 | 72 |
| Colour | Grey | 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 Tantalate 42° Y-cut | ||
|---|---|---|
| Curie temperature Tc (°C) | Black 602.5±2 |
Standard 602.5±2 |
| SAW velocity | Unchanged | 4022 (3) |
| Coupling coefficient k(2) | Unchanged | 7.6 |
(3) Surface skimming bulk wave.
Comparisons for Lithium Tantalate 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 | Super Black | |
|---|---|---|
| Bulk Resistivity (Ω · cm) | 0.9E+11 ˜ 9.0E+11 | 1.0E+10 ˜ 9.0E+10 |
| Bulk Conductivity (Ω · cm-1) | 1.1E-11 ˜ 1.11E-12 | 1.0E-10 ˜ 1.11E-11 |
Typical Specifications
| Orientation | Diameter | Thickness | Surface Finish | |
|---|---|---|---|---|
| (+) plane | (-) plane | |||
| 36 ° 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 |
| 39 ° Y-cut | ||||
| 42 ° Y-cut | ||||
| 46 ° Y-cut | ||||
| 48 ° Y-cut | ||||
| X-cut | ||||
In addition to the above, we can apply our de-oxidation treatment to Lithium Tantalate wafers of any specification.
