Influences of perpendicular compressive stress on the dielectric and ferroelectric properties of electrostrictive and piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 ceramics

Abstract

The dielectric and ferroelectric properties of (1−x)Pb(Mg1/3Nb2/3)O3-(x)PbTiO3 or (1−x)PMN-(x)PT (x=0.1–0.4) ceramics were measured under compressive stress applied perpendicular to the electric field. For the dielectric properties, the experimental results revealed that the superimposed perpendicular compression stress reduced the dielectric constant but increased the dielectric loss tangent of all the compositions. On the other hand, for the ferroelectric properties the applied stress noticeably enhanced the dissipation energy, the polarizations, and the coercive field of all the compositions. These results were interpreted through the non-180° ferroelastic domain switching processes, the stress clamping of domain walls, the deaging mechanism, and the stress induced enhancement in the switchable part of spontaneous polarization. More importantly, the influences of the stress applied in the perpendicular direction to the electric field were generally opposite to those of the parallel stress.

Dielectric and tunable properties of barium strontium titanate ceramics under the stresses

“…However, dielectric loss increases continuously with increasing stress. Similar experimental phenomena have been obtained in Fe 3+ /Nb 5+ doped BaTiO 3 ceramics [18], and Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 ceramics [19], where dielectric constant decreases, and dielectric loss increases with increasing the external stresses. Interestingly, the stress-induced shift of cubic-tetragonal (C-T) phase transition of Ba 0.65 Sr 0.35 TiO 3 ceramics was observed.…”

Mechanical Confinement: An Effective Way of Tuning Properties of Piezoelectric Crystals

“…Most importantly, indium is a scarce element in the earth's crust and its estimated reserves are extremely limited. [14] Since there exists evidences that the domain structure and electrical properties could be altered in PMN-PT single crystals [15][16][17] and polycrystalline ceramics [18,19] by application of external stresses, we speculate that mechanical confinement could be an alternative way to enhance Ec without sacrificing the piezoelectric coefficients in relaxorbased piezocrystals.…”