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Table 3 Specifications of four piezoelectric materials affecting energy transduction efficiency

From: Development of a battery-free ultrasonically powered functional electrical stimulator for movement restoration after paralyzing spinal cord injury

Material

Coupling coefficient

Dielectric loss

Mechanical quality factor

PZT4

0.55

0.005

800

PZT5

0.74

0.02

70

PZT8

0.63

0.003

1100

BaTiO3

0.43

0.005

1300