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PMN-PT Crystal
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Piezo Properties
New Applications
New Opportunities of Piezoelectric PMN-PT Crystal

The piezoelectric PMN-PT crystals with compositions near but not to close to the MPB exhibit anomalously high dielectric and piezoelectric properties making them candidates for a broad range of applications in acoustic transduction devices such as actuators, sensors, ultrasonic imaging transducers, underwater acoustics, active vibration control, transformers, optics, and bulk acoustic wave devices for telecommunications.

There are mainly four types of piezoeletric effects for applications:

  • LE: Longitudinal Extension
  • TE: Transvers extension
  • LS: Longitudinal Shear
  • TS: Transverse Shear

4 types of piezoelectric effect give 18 configuration of strain-poling relations

Strain
123456
Polarization 1 LETETE LSTSTS
2 TELETE TSLSTS
3 TETELE TSTSLS

The best piezoelectric coefficients of PMN-PT crystals with PT-content 27~33% are: d33 2000~3000 pC/N with <001> poling, d31 -1200~-1800 pC/N fro for <011> poling, d36 2500 pC/N fro for <011> poling, and d15 4000~6000 pC/N with <111> poling

TELELSTS
<001> poling d31/d32
-800 ~ -1000 pC/N
d33
2000 ~ 3000 pC/N
k33 > 0.90
d36
0
d15, d24
< 100
<011> poling d31
-1200 ~ -1800 pC/N
k31 ~ 0.84 -0.90
d33
< 500 pC/N
d36
2500pc/N
d15, d24
2000 ~ 3500 pC/N
k15 > 0.9
<111> poling d31, d32
< 150 pC/N
d33
< 200 pC/N
d36
0
d15/d24
4000 ~ 7000 pC/N
k15 > 0.95

Comparison between PMN-PT Crystal and PZN-5H Ceramics

d31 d33 d36 d15
PMN-PT
Crystals
-1200 ~ 1800 pC/N
k31 : 0.84 ~ 0.90
zxt - 0 cut
2000 ~ 3000 pC/N
k33 > 0.90
zxt - 0 cut
2000 ~ 2500 pC/N
k36 > 0.90
zxt - 45 cut
4000 ~ 7000 pC/N
k15 > 0.95
xzt - 22.5 cut
PZN-5H
Ceramics
-274 pC/N
k31 : 0.39
593 pC/N
k33 : 0.75
0
0
741 pC/N
k15 : 0.68


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