Piezoelectric sensors Ca2Al2SiO7 Piezoelectric Crystal CAS Single crysal substrate
Piezoelectric sensors CAS Single crysal substrate Ca2Al2SiO7 Piezoelectric Crystal
Ca2Al2SiO7 (CAS) bulk single crystals were grown by the Czochralski method. Material constants of the crystal were determined over the driving temperature range of a typical combustion pressure sensor. The electrical resistivity at 800 °C was found to be of the order of 108 Ωcm. We constructed a measurement system for the direct piezoelectric effect at high temperature, and characterized the crystals in a simulated engine cylinder combustion environment. Output charge signal against applied stress was detected at 700 °C. These observations suggest that CAS crystals are superior candidate materials for high temperature for stress sensing.
Properties:
| Density | Dm | 3.038 |
| Electromechanical coupling factors | k31 | 16.5% |
| Elastic coefficient(10-12m2/N) | s11E | 9.06 |
| Piezoelectric coefficient [pC/N] | D14 | 6.04 |
| Relative dielectric coefficient(-) | ε11T/ε0 | 10.6 |
Advantage:
Piezoeletric performance
High temperature performance
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