The following 4 working modes are mostly acceptable.
They are:
Longitudinal Extension Mode - d33 2000~3000 pC/N with <001> poling,
Transvers Extension Mode - d31 -1200~-1800 pC/N fro for <011> poling,
Longitudinal Shear Mode - d36 2500 pC/N for <011>poling and
Transverse Shear Mode - d15 4000~6000 pC/N with <111> poling.
Longitudinal Extension k33 Mode:
<001> seeded large-sized (2 inch diameter 4 inch long) PMN-PT single crystals
have been manufactured using a modified Bridgman technique. The piezoelectric
PMN-PT single crystal with PT-content 27~33% posses superior piezoelectric properties over the
traditional PZT ceramics. It revolutionizes piezoelectric materials applications. It can be
categorized to 2 compositional type of PMN-PT crystals.
Specification of 3 compositional types of <001> poled PMN-PT Single Crystalls
| PROPERTIES |
PMN-PT-A (PT=0.27~0.30)
Fot Large Signal |
PMN-PT-B (PT=0.30~0.33)
For Small Signal |
| K33T @ 20 C |
4500~5500 |
5500~6500 |
| d33T (pC/N) |
1400~2000 |
2000~3500 |
| Coupling Coefficient k33 |
0.87~0.90 |
0.90~0.94 |
| Y33E (GPa) |
20~25 |
16~20 |
| Ec (V/mm) |
300 |
250 |
| tand (1KH, 20 oC) |
< 0.005 |
< 0.008 |
Depolarization
Temperature (oC) |
> 90 |
> 75 |
Thermal Conductivity
(W/cm.K) |
0.0026 |
0.0025 |
Thermal Expansion
Coefficient 10-6/
oC (20~70 oC) |
9.5 |
>10 |
Ferroelctric hystersis of a PMN-33%PT crystal with fully <001> poling at 25o
Stain-ac field behavior of a PMN-33%PT crystal
Transvers Extension k31 Mode:
See New Applications Page
Longitudinal Shear k36 Mode:
See New Applications Page
Transverse Shear k15 Mode:
See New Applications Page
