2021年8月30日
High valence states of Pd supported on ferroelectric BaTiO3 driven by electric polarization
Applied Physics Letters
- 巻
- 119
- 号
- 9
- 開始ページ
- 092904
- 終了ページ
- 092904
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/5.0066289
- 出版者・発行元
- AIP Publishing
At a metal-ferroelectric junction, it has been considered that the electric polarization of the ferroelectric material can affect the electronic structure of the neighboring metal. Here, we demonstrate that the valence state of Pd can be shifted to the unstable high value of 4+ by the electric field of electric polarization in ferroelectric BaTiO3. Study of the absorption fine structure of both hard and soft x rays revealed the existence of Pd4+ states on the surface of Pd oxide nanoparticles. The positions of Pd and oxygen atoms are shifted in opposite directions by the electric field due to the electric polarization of ferroelectric BaTiO3. The atomic displacement of Pd and O forms a zigzag structure, in which the coordination number of Pd atoms is changed from four to six, producing a quadrivalent state. This report presents experimental evidence that ferroelectric polarization can control the electronic states of neighboring metal atoms, and we suggest that using the ferroelectric support effect may produce a new type of catalyst.
- リンク情報
- ID情報
-
- DOI : 10.1063/5.0066289
- ISSN : 0003-6951
- eISSN : 1077-3118
- Web of Science ID : WOS:000729154100011