Microstructural phase coexistence kinetics near the polymorphic phase boundary
| dc.contributor.author | Torres-Matheus OA | |
| dc.contributor.author | García RE | |
| dc.contributor.author | Bishop CM | |
| dc.date.accessioned | 2021-02-23T22:34:40Z | |
| dc.date.available | 2021-02-23T22:34:40Z | |
| dc.date.issued | 2021 | en |
| dc.date.updated | 2021-02-12T04:58:39Z | |
| dc.description.abstract | © 2020 Acta Materialia Inc. By implementing a novel multiphase field model for ferroelectric systems, the phase coexistence of the tetragonal (T) and rhombohedral (R) phases in Pb-free BZT-40BCT was analyzed. Metastable coexistence of the T and R phases is predicted between a thermodynamic upper limit at TC,R=49.90∘C and a kinetic lower limit determined by the time-temperature-transformation behaviour. Predicted domain microstructures exhibit faceted domain walls and curved T-R phase interfaces that are consistent with recent TEM studies in the vicinity of the polymorphic phase boundary (PPB). Further, miniaturization of the domain structure near the PPB is a result of the relatively low interfacial energies and a pinning effect caused by the large metastable phase fraction that originates from the vanishing macroscopic driving force for phase transformation. Particularly, the vanishing of rhombohedral domain wall energies as T→TC,R enables a phase transformation-induced polarization rotation mechanism and predicts a hierarchical domain morphology for the R phase. These results are in agreement with the higher piezoelectric response reported near the maximum temperature for R+T coexistence and the observations of a miniaturized nanodomains structure within micron-sized, wedge-shaped domains in the R phase for the BZT-xBCT system. | en |
| dc.identifier.citation | Torres-Matheus OA, García RE, Bishop CM (2021). Microstructural phase coexistence kinetics near the polymorphic phase boundary. Acta Materialia. 206. 116579-116579. | en |
| dc.identifier.doi | http://doi.org/10.1016/j.actamat.2020.116579 | |
| dc.identifier.issn | 1359-6454 | |
| dc.identifier.uri | https://hdl.handle.net/10092/101667 | |
| dc.language | en | |
| dc.language.iso | en | |
| dc.publisher | Elsevier BV | en |
| dc.rights | All rights reserved unless otherwise stated | en |
| dc.rights.uri | http://hdl.handle.net/10092/17651 | en |
| dc.subject | phase field model | en |
| dc.subject | ferroelectric domain coarsening | en |
| dc.subject | surface energy (anisotropy) | en |
| dc.subject | phase coexistence | en |
| dc.subject | phase transformation kinetics | en |
| dc.subject.anzsrc | Fields of Research::51 - Physical sciences::5103 - Classical physics::510303 - Electrostatics and electrodynamics | en |
| dc.subject.anzsrc | Fields of Research::51 - Physical sciences::5103 - Classical physics::510304 - Thermodynamics and statistical physics | en |
| dc.title | Microstructural phase coexistence kinetics near the polymorphic phase boundary | en |
| dc.type | Journal Article | en |
| uc.college | Faculty of Engineering | |
| uc.department | Mechanical Engineering |