Complete Sets of Material Constants of [001]-Poled 0.72Pb(Mg1/3Nb2/3)O3- 0.28PbTiO3 Single Crystals Using Alternating Current Poling

Alternating current poling (ACP) is an effective method to improve the piezoelectric performance of relaxor-PbTiO3 (PT) ferroelectric single crystal. 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-PT) single crystals have been used to fabricate piezoelectric transducers for medical imaging. Up to date, there are no reports about the full matrix material constants of PMN-0.28PT single crystals poled by ACP. Here, we report the complete sets of elastic, dielectric, and piezoelectric properties of [001]-poled PMN-0.28PT single crystals by direct current poling (DCP) and ACP through the resonance method. The results show that [001]-poled rhombohedral PMN-0.28PT single crystals exhibit the enhancement of longitudinal and transverse piezoelectric properties (
${d}_{33} \sim 2000$
pC/N,
${d}_{31} \sim -1010$
pC/N) after ACP. Compared with DCP samples (
${d}_{33} \sim 1660$
pC/N,
${d}_{31} \sim -780$
pC/N), the values of
${d}_{33}$
and
${d}_{31}$
increase 20% and 29%, respectively. While the
${d}_{15}$
value decrease from 110 pC/N for DCP sample to 90 pC/N for ACP sample, showing the decrease in transverse shear piezoelectric properties. In addition, the elastic stiffness coefficients
${c}_{11}$
,
${c}_{12}$
,
${c}_{13}$
, the elastic compliance coefficients
${s}_{11}$
,
${s}_{12}$
, and the dielectric constants
$\varepsilon _{11}$
,
$\varepsilon _{33}$
have great change compared with DCP and ACP samples. This variation of the property matrices provides a reference for high-performance piezoelectric device design.