Saturated domain switching textures and strains in ferroelastic ceramics

Abstract

This paper introduces saturated domain switching textures of three different ferroelastic ceramic crystal systems. The accompanying extrinsic domain switching strain is calculated exclusively using a volume-weighted integral of a single pole figure. In ceramics which are also ferroelectric, the electromechanical response is defined by the domain switching textures, strains, and strain asymmetry, which are found to be functions of the number and directions of possible ferroelastic structural distortions.

Electric-field-induced strain contributions in morphotropic phase boundary composition of (Bi1/2Na1/2)TiO3-BaTiO3 during poling

“…The higher degree of e D Tet is directly related to the large g Tet ($1.26% at E max ) that is approximately four times greater than the g Rh is $0.34%. 20 From the phase weighted calculated strain (green circles in Figures 3(c)-3(e)), it is evident that in the mixed phase BNT-7BT composition, extrinsic processes are the major contributors to the electric-field-induced strain, a result that is consistent with that reported for an MPB composition of Pb(Zr,Ti)O 3 . 48,49 The comparison of calculated total strain and measured macroscopic strain is shown in Figure 3(f).…”

“…Quantification of microscopic origins from in situ diffraction data in different materials has been successfully conducted using selected reflection-fitting methods. [20][21][22][23][24] However, this method to quantify domain texture, lattice strain, and phase transformation strain for mixed-phase materials is difficult due to significant peak overlap. This difficulty can be overcome using full pattern Rietveld refinements.…”

Nonlinear stress-strain behavior and stress-induced phase transitions in soft Pb(Zr1−xTix)OSeo1, Franzbach2, Koruza3 et al. 2013Phys. Rev. BSelf Cite496261View full textAdd to dashboardCite

“…Previous researchers have calculated the theoretical maximum ε r /ε s for the rhombohedral and the tetragonal phases for electrical and mechanical loading. 37,38 It was found that the maximum ε r /ε s during compressive mechanical loading of polycrystalline samples that have an initial random orientation (i.e., untextured) was −0.269 and −0.285 for the tetragonal and rhombohedral phases, respectively. Here it was assumed that the single crystalline grains do not interact, must remain within their initial crystal phase (i.e., phase transitions were not allowed), have the same lattice distortion and retain it throughout loading, and are permitted to ferroelastically switch (i.e., no clamping effects, etc.).…”

Statistical electric field and switching time distributions in PZT 1Nb2Sr ceramics: Crystal- and microstructure effects

“…Generally, high Zr containing rhombohedral materials in both film and ceramic forms exhibit a higher ratio of switched unit cells than tetragonal ones. 44,45 This is in favor of a narrower spatial distribution of principal axes of the random dielectric tensor e ik which approaches a uniform tensor and, consequently, produces a more uniform spatial field distribution. The latter is described by a statistical field distribution as in Fig.…”