Design of ferroelectric domain structure for independent control of piezoelectricity and electricity

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01616
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Kumamoto University (2022-2023); Tokyo Institute of Technology (2021)
• Principal Investigator: Shiraishi Takahisa 熊本大学, 先進マグネシウム国際研究センター, 准教授 (50758399)
• Co-Investigator(Kenkyū-buntansha): 木口 賢紀 熊本大学, 先進マグネシウム国際研究センター, 教授 (70311660)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 強誘電体薄膜 / 低温合成 / ドメイン構造 / 振動発電

Outline of Final Research Achievements

Purpose of this study is to establish the material design guidelines to achieve both high piezoelectric and low dielectric constants in order to develop the high-performance vibration energy harvesters. As a result, it was found that achieving a self-polarized state is essential. In addition, we proposed that the hydrothermal method, which is a low-temperature film formation technology that does not cause phase transition during the cooling process, is one of the effective methods to achieve a unique polarization state. Furthermore, by adapting the method to several typical ferroelectric materials, we demonstrated the validity of our findings.

Free Research Field

強誘電体材料

Academic Significance and Societal Importance of the Research Achievements

強誘電体を用いた振動発電用薄膜材料の開発において、圧電定数と誘電率のトレードオフ関係を打開することが困難とされてきた。本研究では、未解決課題に対する有効な材料設計指針を提案した点で学術的意義がある。また、振動発電はバッテリーフリーなデバイスの実現に有効であるとされており、高性能な発電デバイスの実現に資する点で社会的意義は大きい。