Contribution from Ferroelastic Domain Switching Detected Using X‐ray Diffraction to R‐Curves in Lead Zirconate Titanate Ceramics

Abstract

In Pb(Zr,Ti)O 3 ceramics, which are characterized by different magnitudes of coercive tensile stress, the ferroelastic domain switching induced during crack growth was measured using X-ray diffraction, and was compared with the R-curve behavior. The following correlation was established: material with smaller coercive stress has a larger amount of domain switching, and a higher toughness increment in the R-curve. The half-width of the process zone was determined for one of the four studied compositions from the spatial distribution of domain switching measured using X-ray diffraction from synchrotron source. Its value, 60 -80 m, was in good agreement with the estimate from fracture mechanics.

Nonlinear stress-strain behavior and stress-induced phase transitions in soft Pb(Zr1−xTix)OSeo1, Franzbach2, Koruza3 et al. 2013Phys. Rev. B496261View full textAdd to dashboardCite

“…23 The different crystallographic phases and lattice distortions are accompanied by different ferroelectric and ferroelastic responses under electrical and mechanical fields, resulting from changes in the critical energy barrier to switch domains. 24,25 As a direct consequence of the temperature-and composition-dependence of the crystal lattice distortion, the ferroelectric-ferroelastic behavior of PZT is both composition and temperature-dependent.…”

Anomalous toughening in nanoscale ferroelectrics with polarization vortices

“…The intense stress concentration with the form of a singular field at a crack tip and significant crosscoupling between the ferroelectric spontaneous polarization and mechanical stress/strain induces local polarization switching near the tip [16][17][18][19][20][21][22][23][24][25][26][27], which often shields (or anti-shields) the crack from applied mechanical loads and thus apparently toughens (or weakens) these ferroelectric materials [17,18,25,27]. Therefore, an understanding of the mechanical behavior of cracks in ferroelectric materials is of central importance, not only for the reliability of ferroelectric devices, but also with respect to fundamental physics and mechanics.…”

“…Therefore, an understanding of the mechanical behavior of cracks in ferroelectric materials is of central importance, not only for the reliability of ferroelectric devices, but also with respect to fundamental physics and mechanics. To date, the mechanical behavior of cracks and the polarization switching characteristics have been intensively studied both experimentally and theoretically [16][17][18][19][20][21][22][23][24][25][26][27], which has mostly elaborated on macroscale ferroelectrics where the cracks are simply assumed to behave in a uniform (monodomain) polarization.…”

Effect of Nb and K doping on the crack propagation behaviour of lead zirconate titanate ceramics

“…They are rather modified by the introduction of substitutionals in the A or B sites of their perovskite structure ABO 3 . The role of the doping agents is to improve material properties for the adaptation to quite specific applications.…”

“…Recent works have been focused on mechanical behaviour of PZT ceramics. [1][2][3][4] Their aptitude to reinforcement by ferroelastic domain switching 5 is of a great interest as it enhances their reliability by increasing flaw tolerance.…”