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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.12378 |
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| _version_ | 1866908831554994176 |
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| author | Kothalawala, Veenavee Nipunika Suzuki, Kosuke Nokelainen, Johannes Makkonen, Ilja West, Erica Roininen, Lassi Leinonen, Jere Tynjälä, Pekka Laine, Petteri Välikangas, Juho Lassi, Ulla Devi, Assa Aravindh Sasikala Alatalo, Matti Mizuno, Yuki Tsuji, Naruki Usami, Hikaru Nagasaki, Yuju Takami, Tsuyoshi Sakurai, Yoshiharu Sakurai, Hiroshi Babar, Mohammad Vishwanathan, Venkat Bansil, Arun Barbiellini, Bernardo |
| author_facet | Kothalawala, Veenavee Nipunika Suzuki, Kosuke Nokelainen, Johannes Makkonen, Ilja West, Erica Roininen, Lassi Leinonen, Jere Tynjälä, Pekka Laine, Petteri Välikangas, Juho Lassi, Ulla Devi, Assa Aravindh Sasikala Alatalo, Matti Mizuno, Yuki Tsuji, Naruki Usami, Hikaru Nagasaki, Yuju Takami, Tsuyoshi Sakurai, Yoshiharu Sakurai, Hiroshi Babar, Mohammad Vishwanathan, Venkat Bansil, Arun Barbiellini, Bernardo |
| contents | We discuss electronic and magnetic properties of Na$_x$Fe$_{1/2}$Mn$_{1/2}$O$_2$, a promising Na-ion battery cathode material. Using x-ray Compton scattering, SQUID magnetometry, and density-functional-theory based modeling, we probe how electrons and spins evolve during sodiation. By comparing Compton profiles of sodiated and desodiated samples, we show that oxygen 2$p$ orbitals drive the redox process, while transition-metal 3$d$ electrons become more delocalized, explaining the metallic phase at $x=2/3$. These profile differences define a quantitative descriptor for the sodiation range associated with improved conductivity. Electron holes on oxygen, reflected in oxygen magnetization, confirm the important role of oxygen in the electrochemical activity of the cathode. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12378 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Investigating the Electronic and Magnetic Properties of Na$_x$Fe$_{1/2}$Mn$_{1/2}$O$_2$ Cathode Materials with X-ray Compton Scattering Kothalawala, Veenavee Nipunika Suzuki, Kosuke Nokelainen, Johannes Makkonen, Ilja West, Erica Roininen, Lassi Leinonen, Jere Tynjälä, Pekka Laine, Petteri Välikangas, Juho Lassi, Ulla Devi, Assa Aravindh Sasikala Alatalo, Matti Mizuno, Yuki Tsuji, Naruki Usami, Hikaru Nagasaki, Yuju Takami, Tsuyoshi Sakurai, Yoshiharu Sakurai, Hiroshi Babar, Mohammad Vishwanathan, Venkat Bansil, Arun Barbiellini, Bernardo Materials Science We discuss electronic and magnetic properties of Na$_x$Fe$_{1/2}$Mn$_{1/2}$O$_2$, a promising Na-ion battery cathode material. Using x-ray Compton scattering, SQUID magnetometry, and density-functional-theory based modeling, we probe how electrons and spins evolve during sodiation. By comparing Compton profiles of sodiated and desodiated samples, we show that oxygen 2$p$ orbitals drive the redox process, while transition-metal 3$d$ electrons become more delocalized, explaining the metallic phase at $x=2/3$. These profile differences define a quantitative descriptor for the sodiation range associated with improved conductivity. Electron holes on oxygen, reflected in oxygen magnetization, confirm the important role of oxygen in the electrochemical activity of the cathode. |
| title | Investigating the Electronic and Magnetic Properties of Na$_x$Fe$_{1/2}$Mn$_{1/2}$O$_2$ Cathode Materials with X-ray Compton Scattering |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.12378 |