Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization
Lead-free alkali niobates Na0.5K0.5NbO3 (NKN) ceramics, with significantly enhanced ferroelectric remanent polarization (Pr), were prepared using Spark Plasma Sintering (SPS). Three types of boundaries were observed in the ceramics, being grain boundaries between faceted grains, domain boundaries th...
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| Format: | Article |
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Elsevier
2017-12-01
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| Series: | Journal of Materiomics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352847817300552 |
| _version_ | 1797726937543606272 |
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| author | Zhijian Shen Daniel Grüner Mirva Eriksson Lyubov M. Belova Ce-Wen Nan Haixue Yan |
| author_facet | Zhijian Shen Daniel Grüner Mirva Eriksson Lyubov M. Belova Ce-Wen Nan Haixue Yan |
| author_sort | Zhijian Shen |
| collection | DOAJ |
| description | Lead-free alkali niobates Na0.5K0.5NbO3 (NKN) ceramics, with significantly enhanced ferroelectric remanent polarization (Pr), were prepared using Spark Plasma Sintering (SPS). Three types of boundaries were observed in the ceramics, being grain boundaries between faceted grains, domain boundaries that separate ferroelectric domains inside individual grains, and nanoscale sub-grain boundaries that reveal the nano-scale mosaicity of individual grains. Part of the sub-grain boundaries were from initial powder particles. The other sub-grain boundaries were built by ordered coalescence of nano-crystals during rapid SPS process. It was worthwhile to emphasize that the ordered coalescence of nano-crystals in bulk ceramics during sintering takes place and completes within minutes. These sub-grain features would disappear at higher temperature by long time sintering. Rapid Spark Plasma Sintering allowed us to capture this transient microstructure. The significantly enhanced ferroelectric Pr of NKN was attributed to nanoscale sub-boundaries, which stimulated the dynamics of ferroelectric domain formation and switching. |
| first_indexed | 2024-03-12T10:52:38Z |
| format | Article |
| id | doaj.art-844bcf156fb34f2c9205fe628e4cf24c |
| institution | Directory Open Access Journal |
| issn | 2352-8478 |
| language | English |
| last_indexed | 2024-03-12T10:52:38Z |
| publishDate | 2017-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj.art-844bcf156fb34f2c9205fe628e4cf24c2023-09-02T06:45:14ZengElsevierJournal of Materiomics2352-84782017-12-013426727210.1016/j.jmat.2017.08.004Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarizationZhijian Shen0Daniel Grüner1Mirva Eriksson2Lyubov M. Belova3Ce-Wen Nan4Haixue Yan5Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, SwedenDepartment of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, SwedenDepartment of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, SwedenDepartment of Materials Science and Engineering, Royal Institute of Technology, 100 44, Stockholm, SwedenSchool of Materials Science and Engineering, Tsinghua University, Beijing, 100084, ChinaSchool of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UKLead-free alkali niobates Na0.5K0.5NbO3 (NKN) ceramics, with significantly enhanced ferroelectric remanent polarization (Pr), were prepared using Spark Plasma Sintering (SPS). Three types of boundaries were observed in the ceramics, being grain boundaries between faceted grains, domain boundaries that separate ferroelectric domains inside individual grains, and nanoscale sub-grain boundaries that reveal the nano-scale mosaicity of individual grains. Part of the sub-grain boundaries were from initial powder particles. The other sub-grain boundaries were built by ordered coalescence of nano-crystals during rapid SPS process. It was worthwhile to emphasize that the ordered coalescence of nano-crystals in bulk ceramics during sintering takes place and completes within minutes. These sub-grain features would disappear at higher temperature by long time sintering. Rapid Spark Plasma Sintering allowed us to capture this transient microstructure. The significantly enhanced ferroelectric Pr of NKN was attributed to nanoscale sub-boundaries, which stimulated the dynamics of ferroelectric domain formation and switching.http://www.sciencedirect.com/science/article/pii/S2352847817300552Lead-freeNKNSPSRemanent polarizationOrdered coalescence |
| spellingShingle | Zhijian Shen Daniel Grüner Mirva Eriksson Lyubov M. Belova Ce-Wen Nan Haixue Yan Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization Journal of Materiomics Lead-free NKN SPS Remanent polarization Ordered coalescence |
| title | Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization |
| title_full | Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization |
| title_fullStr | Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization |
| title_full_unstemmed | Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization |
| title_short | Ordered coalescence of nano-crystals in alkaline niobate ceramics with high remanent polarization |
| title_sort | ordered coalescence of nano crystals in alkaline niobate ceramics with high remanent polarization |
| topic | Lead-free NKN SPS Remanent polarization Ordered coalescence |
| url | http://www.sciencedirect.com/science/article/pii/S2352847817300552 |
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