Temperature coefficient of piezoelectric constants in Pb(Mg1/3 Nb2/3)O3 - PbTiO3 ceramics

Abstract

In this work, the thermal stability of piezoelectric constants of PMN-PT ceramics in the tetragonal and rhombohedral phases were investigated in a wide range of temperatures. The results showed that the tetragonal PMN-PT presented higher thermal stability and, consequently, the temperature coefficients for the piezoelectric constants were approximately zero. This result revealed to be much better than that commonly found for PZT ceramics. Although the rhombohedral PMN-PT presented a slight lower thermal stability, the values found for the coupling factor were significantly higher than the tetragonal composition

Influence of strain on the magnetization and magnetoelectric effect inLa0.7A0.3MnO3∕PMN−PT

“…In order to avoid both hysteresis and risk of cracks due to mechanical forces at polarization reversal, most experiments are carried out at > > E E max 0 after applying max E to the crystal. The temperature dependence of the piezoelectric strain is assumed to be sufficiently weak 39 to be neglected here, apart from an increase of the ferroelectric coercive fields at low temperature. Further, the negligibility of the magnetic signal from the current flowing through the piezo-crystal (limited to 1 µ A, but usually being < 0.1 µ A) has been verified in the paramagnetic state of the films.…”

Piezoresponse Force Microscopy Imaging of Ferroelectric Domains in Bi(Zn 1/2 Ti 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 Piezoelectric Ceramics

“…[4,5] However, PMN-PT ceramics close to the MPB show inferior temperature stabilities of dielectric and piezoelectric properties, which inhibits their wide temperature range applications. [6,7] Bismuth zinc titanate Bi(Zn 1/2 Ti 1/2 )O 3 (BZT) is a novel lead-free polar compound which displays extremely large cation displacements and is tetragonality analogous to PT. [8,9] Recently, first-principles calculations and experimental investigations of the BZT-PT solid solution indicate that hybridization between Zn 4𝑠 and 4𝑝 and O 2𝑝 orbitals allows the formation of short covalent Zn-O bonds, enabling favorable coupling between A-site and B-site displacements in perovskite structures.…”