Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM
Barium titanate, BiTaO3 (BTO), is a highly researched material due to being one of the oldest ferroelectric materials and also its remarkable properties. Its ferroelectric properties give rise to applications in devices such as ferroelectric random-access memories, capacitors and more. To underst...
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| Format: | Thesis-Master by Research |
| Language: | English |
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Nanyang Technological University
2024
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| Online Access: | https://hdl.handle.net/10356/180284 |
| _version_ | 1824455099465859072 |
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| author | Li, Patrick Wen Feng |
| author2 | Lam Yeng Ming |
| author_facet | Lam Yeng Ming Li, Patrick Wen Feng |
| author_sort | Li, Patrick Wen Feng |
| collection | NTU |
| description | Barium titanate, BiTaO3 (BTO), is a highly researched material due to being one of the oldest ferroelectric materials and also its remarkable properties. Its ferroelectric properties give rise to applications in devices such as ferroelectric random-access memories, capacitors and more.
To understand more about the dynamics and interactions within BTO in order to improve its functionality, the ferroelectric domains in the material have to be studied. However, these domains are on the nanoscale and need a technique such as transmission electron microscopy (TEM) to image them. Inside the TEM, these domains can be imaged and influenced in situ using an applied external electric field. This requires special equipment and training.
Furthermore, BTO has four main temperature dependent crystal structures, three of which are ferroelectric. Two of the ferroelectric phases exist below room temperature and therefore will require cooling to reach. In summary, the equipment required to fully explore the different ferroelectric domains associated with each phase of BTO will need the ability to apply an external electric bias whilst also cooling the sample down to below room temperature ranges.
Nanyang Technological University (NTU) has one such TEM specimen holder capable for such experiments. Unfortunately, it is proprietary and lacks any sort of consistent workflow to produce the suitable specimen.
In this work, not only is a consistent workflow for these experiments created but also a new and more efficient design for the micro electromechanical systems (MEMS) chips is devised from the experience of preparing the specimens for such experiments. Finally, the workflow is successfully carried on the aforementioned BTO material, showing the ability to cool, heat and apply and electrical bias. Thus, proving the success of the workflow and demonstrating the capabilities and potential of this technique. |
| first_indexed | 2025-02-19T03:32:49Z |
| format | Thesis-Master by Research |
| id | ntu-10356/180284 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:32:49Z |
| publishDate | 2024 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1802842024-10-07T01:58:14Z Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM Li, Patrick Wen Feng Lam Yeng Ming School of Materials Science and Engineering Facility for Analysis, Characterisation, Testing and Simulation YMLam@ntu.edu.sg Chemistry Engineering Physics Transmission electron microscopy In situ TEM Focused ion beam Scanning electron microscopy FIB-SEM Barium titanate Ferroelectricity Barium titanate, BiTaO3 (BTO), is a highly researched material due to being one of the oldest ferroelectric materials and also its remarkable properties. Its ferroelectric properties give rise to applications in devices such as ferroelectric random-access memories, capacitors and more. To understand more about the dynamics and interactions within BTO in order to improve its functionality, the ferroelectric domains in the material have to be studied. However, these domains are on the nanoscale and need a technique such as transmission electron microscopy (TEM) to image them. Inside the TEM, these domains can be imaged and influenced in situ using an applied external electric field. This requires special equipment and training. Furthermore, BTO has four main temperature dependent crystal structures, three of which are ferroelectric. Two of the ferroelectric phases exist below room temperature and therefore will require cooling to reach. In summary, the equipment required to fully explore the different ferroelectric domains associated with each phase of BTO will need the ability to apply an external electric bias whilst also cooling the sample down to below room temperature ranges. Nanyang Technological University (NTU) has one such TEM specimen holder capable for such experiments. Unfortunately, it is proprietary and lacks any sort of consistent workflow to produce the suitable specimen. In this work, not only is a consistent workflow for these experiments created but also a new and more efficient design for the micro electromechanical systems (MEMS) chips is devised from the experience of preparing the specimens for such experiments. Finally, the workflow is successfully carried on the aforementioned BTO material, showing the ability to cool, heat and apply and electrical bias. Thus, proving the success of the workflow and demonstrating the capabilities and potential of this technique. Master's degree 2024-09-30T12:04:05Z 2024-09-30T12:04:05Z 2024 Thesis-Master by Research Li, P. W. F. (2024). Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/180284 https://hdl.handle.net/10356/180284 10.32657/10356/180284 en This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University |
| spellingShingle | Chemistry Engineering Physics Transmission electron microscopy In situ TEM Focused ion beam Scanning electron microscopy FIB-SEM Barium titanate Ferroelectricity Li, Patrick Wen Feng Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM |
| title | Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM |
| title_full | Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM |
| title_fullStr | Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM |
| title_full_unstemmed | Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM |
| title_short | Understanding the dynamic behaviour and evolution of electric domains in BTO under applied electric field using in situ TEM |
| title_sort | understanding the dynamic behaviour and evolution of electric domains in bto under applied electric field using in situ tem |
| topic | Chemistry Engineering Physics Transmission electron microscopy In situ TEM Focused ion beam Scanning electron microscopy FIB-SEM Barium titanate Ferroelectricity |
| url | https://hdl.handle.net/10356/180284 |
| work_keys_str_mv | AT lipatrickwenfeng understandingthedynamicbehaviourandevolutionofelectricdomainsinbtounderappliedelectricfieldusinginsitutem |