Band gap tuning by structural phase transition in Sm-substituted BiFeO3 powders
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arXiv
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| Hauptverfasser: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915236807704576 |
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| author | Hill, Christina Melchiorre, Michele Milesi-Brault, Cosme Gemeiner, Pascale Karolak, Fabienne Bogicevic, Christine Dkhil, Brahim Canero-Infante, Ingrid Guennou, Mael |
| author_facet | Hill, Christina Melchiorre, Michele Milesi-Brault, Cosme Gemeiner, Pascale Karolak, Fabienne Bogicevic, Christine Dkhil, Brahim Canero-Infante, Ingrid Guennou, Mael |
| contents | The substitution of bismuth by samarium in BiFeO3 is known to induce a structural phase transition from the polar phase to a non-polar phase, with a possible antiferroelectric intermediate structure. In this paper, we investigate the impact of this phase change on the optical properties. The optical band gap was measured by diffuse reflectance as a function of temperature for several samarium concentrations across the structural phase transition. We found that the optical band gap for each of the pure phases varies linearly with temperature and that the phase transitions are revealed by smooth transitions between those linear regimes. This allows us to quantify the contribution of the structural change in the optical absorption. We find that a difference in optical band gap of about 130meV can be attributed to the phase change. We anticipate that the same change could be obtained by applying an electric field in an antiferroelectric composition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08093 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Band gap tuning by structural phase transition in Sm-substituted BiFeO3 powders Hill, Christina Melchiorre, Michele Milesi-Brault, Cosme Gemeiner, Pascale Karolak, Fabienne Bogicevic, Christine Dkhil, Brahim Canero-Infante, Ingrid Guennou, Mael Materials Science The substitution of bismuth by samarium in BiFeO3 is known to induce a structural phase transition from the polar phase to a non-polar phase, with a possible antiferroelectric intermediate structure. In this paper, we investigate the impact of this phase change on the optical properties. The optical band gap was measured by diffuse reflectance as a function of temperature for several samarium concentrations across the structural phase transition. We found that the optical band gap for each of the pure phases varies linearly with temperature and that the phase transitions are revealed by smooth transitions between those linear regimes. This allows us to quantify the contribution of the structural change in the optical absorption. We find that a difference in optical band gap of about 130meV can be attributed to the phase change. We anticipate that the same change could be obtained by applying an electric field in an antiferroelectric composition. |
| title | Band gap tuning by structural phase transition in Sm-substituted BiFeO3 powders |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.08093 |