Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.12022 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910034353455104 |
|---|---|
| author | Jain, Sheetal Zhou, Zhengbang Horsley, Ezekiel Heath, Christopher J. S. Shakouri, Mohsen Xiao, Qunfeng Chen, Ning Chen, Weifeng King, Graham Kim, Young-June |
| author_facet | Jain, Sheetal Zhou, Zhengbang Horsley, Ezekiel Heath, Christopher J. S. Shakouri, Mohsen Xiao, Qunfeng Chen, Ning Chen, Weifeng King, Graham Kim, Young-June |
| contents | We carried out a comprehensive crystal structure characterization of Ti-doped lithium ruthenate (Li$_2$Ti$_x$Ru$_{1-x}$O$_3$), to investigate the effect of Ti-doping on the structural phase transition. Experimental tools sensitive to the average structure (X-ray diffraction), as well as those sensitive to local structure (Extended X-ray Absorption Fine Structure, EXAFS; pair distribution function, PDF) are used. We observed non-monotonic dependence of the structural transition temperature on the Ti-doping level. At low doping, the transition temperature slightly increases with doping, while at high doping, the temperature decreases significantly with doping. We note two important observations from our studies. First, Ti K-edge EXAFS data shows persistent Ti-Ru dimerization even with substantial Ti doping. Second, we were able to use the PDF data to estimate the dimer correlation length above the transition temperature, which would correspond to the size of the proposed local `dimer clusters' formed by Ru-Ru and Ti-Ru neighbours. The dimer correlation length is found to be around 10~Å, which remains robust regardless of doping. Our study therefore suggests that Ti$^{4+}$ with its $d^0$ electronic configuration is a special type of dopant when replacing Ru. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_12022 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effect of Ti-doping on the dimer transition in Lithium Ruthenate Jain, Sheetal Zhou, Zhengbang Horsley, Ezekiel Heath, Christopher J. S. Shakouri, Mohsen Xiao, Qunfeng Chen, Ning Chen, Weifeng King, Graham Kim, Young-June Materials Science We carried out a comprehensive crystal structure characterization of Ti-doped lithium ruthenate (Li$_2$Ti$_x$Ru$_{1-x}$O$_3$), to investigate the effect of Ti-doping on the structural phase transition. Experimental tools sensitive to the average structure (X-ray diffraction), as well as those sensitive to local structure (Extended X-ray Absorption Fine Structure, EXAFS; pair distribution function, PDF) are used. We observed non-monotonic dependence of the structural transition temperature on the Ti-doping level. At low doping, the transition temperature slightly increases with doping, while at high doping, the temperature decreases significantly with doping. We note two important observations from our studies. First, Ti K-edge EXAFS data shows persistent Ti-Ru dimerization even with substantial Ti doping. Second, we were able to use the PDF data to estimate the dimer correlation length above the transition temperature, which would correspond to the size of the proposed local `dimer clusters' formed by Ru-Ru and Ti-Ru neighbours. The dimer correlation length is found to be around 10~Å, which remains robust regardless of doping. Our study therefore suggests that Ti$^{4+}$ with its $d^0$ electronic configuration is a special type of dopant when replacing Ru. |
| title | Effect of Ti-doping on the dimer transition in Lithium Ruthenate |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.12022 |