Heterogeneous grain-scale response in ferroic polycrystals under electric field

John E. Daniels, Marta Majkut, Qingua Cao, Søren Schmidt, Jon Wright, Wook Jo, Jette Oddershede

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Abstract

Understanding coupling of ferroic properties over grain boundaries and within clusters of grains in polycrystalline materials is hindered due to a lack of direct experimental methods to probe the behaviour of individual grains in the bulk of a material. Here, a variant of three-dimensional X-ray diffraction (3D-XRD) is used to resolve the non-180° ferroelectric domain switching strain components of 191 grains from the bulk of a polycrystalline electro-ceramic that has undergone an electric-field-induced phase transformation. It is found that while the orientation of a given grain relative to the field direction has a significant influence on the phase and resultant domain texture, there are large deviations from the average behaviour at the grain scale. It is suggested that these deviations arise from local strain and electric field neighbourhoods being highly heterogeneous within the bulk polycrystal. Additionally, the minimisation of electrostatic potentials at the grain boundaries due to interacting ferroelectric domains must also be considered. It is found that the local grain-scale deviations average out over approximately 10–20 grains. These results provide unique insight into the grain-scale interactions of ferroic materials and will be of value for future efforts to comprehensively model these and related materials at that length-scale.
Original languageEnglish
Article number22820
JournalScientific Reports
Volume6
Number of pages7
ISSN2045-2322
Publication statusPublished - 2016

Bibliographical note

This work is licensed under a Creative Commons Attribution 4.0 International License.

Projects

FTP-PIEZO Multi-scale mapping of strain mechanisms in lead-free piezoceramics

Oddershede, J., Schmidt, S. & Majkut, M.

01/01/201314/03/2016

Project: Research

Activities

  • 1 Conference presentations

Quantitative grain-scale ferroelectric domain volume fractions and domain switching strains measured by 3DXRD during in situ electrical poling

Jette Oddershede (Lecturer)

1 Oct 2015

Activity: Talks and presentationsConference presentations

Cite this

Daniels, J. E., Majkut, M., Cao, Q., Schmidt, S., Wright, J., Jo, W., & Oddershede, J. (2016). Heterogeneous grain-scale response in ferroic polycrystals under electric field. Scientific Reports, 6, [22820].