Lithium Tantalate – High Physical Strength
High physical strength (so-called Yellow ) Lithium Tantalate has been developed, to give a higher process yield in production. This has now been combined with the electrical properties of the black product to provide a Yellow-Black product for the SAW components industry, giving superior yield while limiting pyro electric effects. Advantages are:
- High physical strength allows bending and dicing, which can produce better process yield, thinner wafers and miniturization
- Endurance against high temperature
- Unaffected by pyro electricity
Lithium Tantalate Wafers – Performance Summary
| Normal | Standard Black | Super Black | Yellow | Yellow Black | |
|---|---|---|---|---|---|
| Colour | White | Grey | Dark Grey | Yellow | Dark Yellow |
| Flexural Strength | Same | Slightly worse | Much much better | Much much better | |
| 3 Point Bending Test (N) | 14~23 | 13~20 | 9~15 | 25~ | 25~ |
| Static Electricity Prevention | Much much better | Much much better | Slightly better | Much much better | |
| Bulk Resistivity Ω cm | E+14~15 | 1~5E+11 | 4~1E+10 | 4.5E+13 | 0.5E~5E+11 |
| Surface Potential (kv) 10-85°C |
4.5 | ~0.3 | ~0.2 | 3.5 | ~0.2 |
| Dicing | Better | Better | Much much better | Much much better | |
| Curie temperature; Tc °C | 603 | 603 | 603 | 603.5 | 603.5 |
| Endurance against high temperature | Better | Much much better | Much much better |
Comparisons
| Response to Pyro Electric Effect – Hot Plate 94°C, wafer 20° to 85°C |  |
| Applying 3-ponts bending test |  |
| Hotplate 300°C One hour |  |
| Cutting Speed : 10.0 mm/second |  |
