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

		Strain
		1	2	3	4	5	6
Polarization	1	LE	TE	TE	LS	TS	TS
	2	TE	LE	TE	TS	LS	TS
	3	TE	TE	LE	TS	TS	LS

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

	TE	LE	LS	TS
<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

	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