Phase transitions and thermal-stress-induced structural changes in a ferroelectric Pb (Zr0.80Ti0. 20)O3 single crystal
Zirconium-rich lead-zirconate-titanate (PZT) Pb(Zr0.80Ti0.20)O3 single crystal is studied by polarized-Raman scattering experiments as a function of temperature. We show that the crystal possesses complex domain boundaries which show no sign of instability even 200 K above the ferroelectric-to-paraelectric phase transition. The boundary stabilized the domains which had the same orientation after cyclic heating and cooling up to 773 K. The domains transformed normally to the cubic paraelectric phase, but returned to their original state after cooling. Physical mechanism behind the reversible behavior is related to the strain between the boundary region and domain, which forces the domain to grow similarly after each heating and cooling cycle. Electron backscattering diffraction measurements show that macroscopic domains, lengths scale in hundreds of microns, are divided into regions whose Pb-displacements are not correlated. The results are notably interesting for non-volatile memory development as it implies that the original ferroelectric state can be restored after the material has been transformed to a paraelectric phase. Incoherent Pbdisplacements play a role for polarization switching.
- Finnish Research and Engineering, Helsinki (Finland)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Simon Fraser Univ., Burnaby, BC (Canada)
- Univ. of Oxford (United Kingdom). Clarendon Lab.
- Publication Date:
- OSTI Identifier:
- Grant/Contract Number:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. Condensed Matter
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 2; Journal ID: ISSN 0953-8984
- IOP Publishing
- Research Org:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org:
- USDOE Office of Science (SC)
- Country of Publication:
- United States
- 36 MATERIALS SCIENCE
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