Soft-Chemical Synthesis, Structure Evolution, and Insulator-to-Metal Transition in a Prototypical Metal Oxide, λ-RhO$_2$
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929233829298176 |
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| author | Chamorro, Juan R. Zuo, Julia L. Bassey, Euan N. Watkins, Aurland K. Zhu, Guomin Zohar, Arava Wyckoff, Kira E. Kinnibrugh, Tiffany L. Lapidus, Saul H. Stemmer, Susanne Clément, Raphaële J. Wilson, Stephen D. Seshadri, Ram |
| author_facet | Chamorro, Juan R. Zuo, Julia L. Bassey, Euan N. Watkins, Aurland K. Zhu, Guomin Zohar, Arava Wyckoff, Kira E. Kinnibrugh, Tiffany L. Lapidus, Saul H. Stemmer, Susanne Clément, Raphaële J. Wilson, Stephen D. Seshadri, Ram |
| contents | $λ$-RhO$_2$, a prototype 4d transition metal oxide, has been prepared by oxidative delithiation of spinel LiRh$_2$O$_4$ using ceric ammonium nitrate. Average-structure studies of this RhO$_2$ polytype, including synchrotron powder X-ray diffraction and electron diffraction, indicate the room temperature structure to be tetragonal, in the space group I41/amd, with a first-order structural transition to cubic Fd-3m at T = 345 K on warming. Synchrotron X-ray pair distribution function analysis and $^7$Li solid state nuclear magnetic resonance measurements suggest that the room temperature structure displays local Rh-Rh bonding. The formation of these local dimers appears to be associated with a metal-to insulator transition with a non-magnetic ground state, as also supported by density functional theory-based electronic structure calculations. This contribution demonstrates the power of soft chemistry to kinetically stabilize a surprisingly simple binary oxide compound. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2310_07053 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Soft-Chemical Synthesis, Structure Evolution, and Insulator-to-Metal Transition in a Prototypical Metal Oxide, λ-RhO$_2$ Chamorro, Juan R. Zuo, Julia L. Bassey, Euan N. Watkins, Aurland K. Zhu, Guomin Zohar, Arava Wyckoff, Kira E. Kinnibrugh, Tiffany L. Lapidus, Saul H. Stemmer, Susanne Clément, Raphaële J. Wilson, Stephen D. Seshadri, Ram Materials Science Strongly Correlated Electrons $λ$-RhO$_2$, a prototype 4d transition metal oxide, has been prepared by oxidative delithiation of spinel LiRh$_2$O$_4$ using ceric ammonium nitrate. Average-structure studies of this RhO$_2$ polytype, including synchrotron powder X-ray diffraction and electron diffraction, indicate the room temperature structure to be tetragonal, in the space group I41/amd, with a first-order structural transition to cubic Fd-3m at T = 345 K on warming. Synchrotron X-ray pair distribution function analysis and $^7$Li solid state nuclear magnetic resonance measurements suggest that the room temperature structure displays local Rh-Rh bonding. The formation of these local dimers appears to be associated with a metal-to insulator transition with a non-magnetic ground state, as also supported by density functional theory-based electronic structure calculations. This contribution demonstrates the power of soft chemistry to kinetically stabilize a surprisingly simple binary oxide compound. |
| title | Soft-Chemical Synthesis, Structure Evolution, and Insulator-to-Metal Transition in a Prototypical Metal Oxide, λ-RhO$_2$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.07053 |