Single Crystal Piezo
Morgan Technical Ceramics ElectroCeramics (MTC ElectoCeramics) offers the PMNT-28 family of single crystal piezoelectric material. PMNT-28 was formulated to exhibit the superior dielectric and electro-mechanical properties required by the most demanding high power sonar projector, medical imaging and actuator applications.
The increased coupling and displacement of the single crystal material result in improved bandwidth, sensitivity and source level. The significantly higher efficiency provides opportunities for increased performance and miniaturization. MTC ElectroCeramics’ high temperature crystal growth process produces boules with larger diameters to support diagnostic medical applications, including echocardiography and abdominal scanning.
For transducer applications, the PMNT-28 provides a 20% improvement of keff compared to conventional polycrystalline PZT (>0.90 versus 0.75), a 45% improvement of efficiency (0.82 versus 0.56), and a 66% improvement of bandwidth (115% versus 43.2%).
In actuator applications, the single crystal PMNT-28 exhibits a maximum strain percentage of approximately 0.6%, three times the approximate 0.18% value of conventional polycrystalline PZT.
| Property | PZT-5H | PMN-PT-28 |
| k33 | 0.75 | 0.86-0.90 |
| k’33 | --- | 0.85-0.88 |
| kp | 0.69 | 0.86 |
| k31 | 0.39 | 0.42 |
| d33 (pC/N) | 690 | 1200-2000 |
| d31 (pC/N) | -280 | -370 |
| g33 (x10-3 Vm/N) | 19.7 | 15.8 |
| g31 (x10-3 Vm/N) | -9.5 | -6.8 |
| Y33E (GPa) | 4.8 | 25-30 |
| s33D (x10-12 m2/N) | 9 | 10-14 |
| K3T after poling (@ 1kHz) | 3300 | 4500-6000 |
| D.F. | 0.02 | <0.01 |
| Qm | 70 | 65 |
| Freq. Const. Nt (Hz-m) | 2000 | 1800 |
| Acous. Imp. (MRayl) | 30 | 28 |
| Density (kg/m3) | 7700 | 8100 |
| TRT Depolarization Temp. (°C) | --- | 85-100 |
| Curie Temp. (°C) | 195 | 125-140 |
PMNT-28 was developed and is manufactured at our facility in Bedford, OH which currently has the capability to grow boules up to 83 mm diameter, enabling the manufacturing of finished elements with lateral dimensions up to 2.36” (60 mm). Standard electrodes are sputtered with thin film nichrome/gold.
