Liu, Na ; Acosta, Matias ; Wang, Shuai ; Xu, Bai-Xiang ; Stark, Robert W. ; Dietz, Christian (2016)
Revealing the core-shell interactions of a giant strain relaxor ferroelectric 0.75Bi1/2Na1/2TiO3-0.25SrTiO3.
In: Scientific Reports, 6 (36910)
Article
Abstract
Lead-free relaxor ferroelectrics that feature a core-shell microstructure provide an excellent electromechanical response. They even have the potential to replace the environmentally hazardous lead-zirconia-titanate (PZT) in large strain actuation applications. Although the dielectric properties of core-shell ceramics have been extensively investigated, their piezoelectric properties are not yet well understood. To unravel the interfacial core-shell interaction, we studied the relaxation behaviour of field-induced ferroelectric domains in 0.75Bi1/2Na1/2TiO3-0.25SrTiO3 (BNT-25ST), as a typical core-shell bulk material, using a piezoresponse force microscope. We found that after poling, lateral domains emerged at the core-shell interface and propagated to the shell region. Phase field simulations showed that the increased electrical potential beneath the core is responsible for the in-plane domain evolution. Our results imply that the field-induced domains act as pivotal points at the coherent heterophase core-shell interface, reinforcing the phase transition in the non-polar shell and thus promoting the giant strain.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Liu, Na ; Acosta, Matias ; Wang, Shuai ; Xu, Bai-Xiang ; Stark, Robert W. ; Dietz, Christian |
| Type of entry: | Bibliographie |
| Title: | Revealing the core-shell interactions of a giant strain relaxor ferroelectric 0.75Bi1/2Na1/2TiO3-0.25SrTiO3 |
| Language: | English |
| Date: | 14 November 2016 |
| Publisher: | Nature |
| Journal or Publication Title: | Scientific Reports |
| Volume of the journal: | 6 |
| Issue Number: | 36910 |
| URL / URN: | http://dx.doi.org/10.1038/srep36910 |
| Abstract: | Lead-free relaxor ferroelectrics that feature a core-shell microstructure provide an excellent electromechanical response. They even have the potential to replace the environmentally hazardous lead-zirconia-titanate (PZT) in large strain actuation applications. Although the dielectric properties of core-shell ceramics have been extensively investigated, their piezoelectric properties are not yet well understood. To unravel the interfacial core-shell interaction, we studied the relaxation behaviour of field-induced ferroelectric domains in 0.75Bi1/2Na1/2TiO3-0.25SrTiO3 (BNT-25ST), as a typical core-shell bulk material, using a piezoresponse force microscope. We found that after poling, lateral domains emerged at the core-shell interface and propagated to the shell region. Phase field simulations showed that the increased electrical potential beneath the core is responsible for the in-plane domain evolution. Our results imply that the field-induced domains act as pivotal points at the coherent heterophase core-shell interface, reinforcing the phase transition in the non-polar shell and thus promoting the giant strain. |
| Identification Number: | doi:10.1038/srep36910 |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials 11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces DFG-Collaborative Research Centres (incl. Transregio) DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres Exzellenzinitiative Exzellenzinitiative > Clusters of Excellence Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI) DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D6: The effect of electric field-induced phase transitions on the blocking force in lead-free ferroelectrics |
| Date Deposited: | 01 Dec 2016 07:11 |
| Last Modified: | 20 Dec 2018 12:12 |
| PPN: | |
| Funders: | N.L., R.W.S. and C.D. thank the Center of Smart Interfaces for their financial support., M.A. thanks the Deutsche Forschungsgemeinschaft through the Sonderforschungsbereich 595/D6 “Electrical Fatigue in Functional Materials”., S.W. and B.X.X. appreciate the financial support from the ‘Excellence Initiative’ of the German Federal and State Governments and the Graduate School of Computational Engineering at Technische Universität Darmstadt. |
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