Effect of Mn on Dielectric and Piezoelectric Properties of 71PMN-29PT [71Pb(Mg1/3Nb2/3)O3-29PbTiO3] Single Crystals and Polycrystalline Ceramics

Abstract

In order to investigate the effect of Mn on the dielectric and piezoelectric properties of PMN-PT [Pb(Mg 1 / 3 Nb 2 / 3)O 3-PbTiO 3 ], four different types of 71PMN-29PT samples were prepared using the solid-state single crystal growth (SSCG) method: (1) Undoped single crystals, (2) undoped polycrystalline ceramics, (3) Mn-doped single crystals, and (4) Mn-doped polycrystalline ceramics. In the case of single crystals, the addition of 0.5 mol% Mn to PMN-PT decreased the dielectric constant (K 3 T), piezoelectric charge constant (d 3 3), and dielectric loss (tan δ) by about 50%, but increased the coercive electric field (E C) by 50% and the electromechanical quality factor (Q m) by 500%, respectively. The addition of Mn to PMN-PT induced an internal bias electric field (E I) and thus specimens changed from piezoelectrically soft-type to piezoelectrically hard-type. This Mn effect was more significant in single crystals than in ceramics. These results demonstrate that Mn-doped 71PMN-29PT single crystals, because they are piezoelectrically hard and simultaneously have high piezoelectric and electromechanical properties, have great potential for application in fields of SONAR transducers, high intensity focused ultrasound (HIFU), and ultrasonic motors.

Piezoelectric and pyroelectric properties of Mn-doped 0.36Pb(In1/2Nb1/2)O3–0.36Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 ceramics

“…The reason was that the dipole deflecting could not keep up with the external field and further lag behind with increasing the frequency. Compared to PMNT ceramics [16], they had high values of EC, making Mn-PIMNT appropriate to be the materials using in high power applications. With the increasing electric field amplitude (E0), the Pr, EC, and hysteresis area <A> all increased gradually, indicating that domain motions and polarization switching became completely.…”

“…The mechanical quality factor Qm was calculated by the equation, According to the admittance spectrum as shown in Fig. 7(b), of the output characteristic parameters for high-power piezoelectric applications [16] was also calculated by the formula,…”

“…The defect dipoles formed by the oxygen vacancies can decrease the mobility of charge carriers on the domain wall and disrupted the stability of the ferroelectric domain [14,15]. This led to a substantially decreased dielectric and mechanical loss, and meanwhile enhanced piezoelectric and pyroelectric properties were achieved [12,15,16].…”

Current status of solid-state single crystal growth

“…Fe, Mn) PMN-PT single crystals with very high quality and excellent dielectric and piezoelectric properties [47]. Recently, growth of undoped and Mn-doped 71PMN-29PT high-quality single crystals using the SSCG method were reported [46], in which excellent piezoelectric and electromechanical properties of both single crystals were demonstrated. With such results, these materials, and especially Mndoped single crystal, could be utilized as high-power piezoelectric transducers in sonars and medical devices.…”

Dielectric, Ferroelectric, Energy Storage, and Pyroelectric Properties of Mn-Doped (Pb0.93La0.07)(Zr0.82Ti0.18)O3 Anti-Ferroelectric Ceramics

“…Mn-doping has been used not only for modulation of the dielectric, ferroelectric, and piezoelectric 15,[18][19][20][21][22] energy storage properties 23) but also for improving the pyroelectric 24) and multicaloric effects. 25,26) Moreover, the effects of MnO 2 content on the permeability and electrical resistance of porous alumina-based ceramics have also been reported.…”