CO <sub>2</sub> -broken Ti–O bonds in the TiO <sub>6</sub> octahedron of CaTiO <sub>3</sub> for greatly enhanced room-temperature ferromagnetism
Preparation of two-dimensional (2D) ferromagnetic nanomaterials and the study of their magnetic sources are crucial for the exploration of new materials with multiple applications. Herein, two-dimensional room-temperature ferromagnetic (FM) CaTiO<sub>3</sub> nanosheets are successfully constructed with the assistance of supercritical carbon dioxide (SC CO<sub>2</sub>). In this process, the SC CO<sub>2</sub>-induced strain effect can lead to lattice expansion and introduction of O vacancies. More importantly, experimentally it can be found out that the breakage of the Ti-O<sub>2</sub> bond by CO<sub>2</sub> directly results in the equatorial plane of the TiO<sub>6</sub> octahedron being exposed. This leads to more opportunities for oxygen vacancies and low-valent titanium to appear, where Ti<sup>3+</sup> can optimize the spin structure, releasing the macroscopic magnetization. Greatly improved room-temperature ferromagnetic behavior, with an optimal magnetization of 0.1661 emu g<sup>-1</sup> and a high Curie temperature (Tc) of 300 K can be achieved.
Authors
- Bo Gao (ORCID: https://orcid.org/0000-0002-8684-5199)
- Qun Jie Xu (ORCID: https://orcid.org/0000-0002-2264-0266)
- Lianyu Li (ORCID: https://orcid.org/0009-0008-9797-3306)
- Yuqi Ouyang
- Yaozheng Tang (ORCID: https://orcid.org/0009-0008-8093-057X)
Institutions
- Zhengzhou University (CN)
Publication Details
- Journal
- Chemical Science
- Published
- 2024-12-10
- DOI
- https://doi.org/10.1039/d4sc05607h
- Citations
- 11
- Primary Topic
- Magnetic and transport properties of perovskites and related materials
- Type
- article
- Field-Weighted Citation Impact
- 1.30
Funders
- National Natural Science Foundation of China
- National Natural Science Foundation of China-Henan Joint Fund