DFT study on the electronic and magnetic properties of the Sr2FeNbO6 compound
| Autor: | J. M. Cervantes, M. Romero, J. León-Flores, E. Carvajal, J.A. Arenas, J.L. Rosas, Raul Escamilla |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Band gap Oxide Crystal structure Metal Condensed Matter::Materials Science Tetragonal crystal system chemistry.chemical_compound chemistry Ferromagnetism Mechanics of Materials visual_art Electrode Materials Chemistry visual_art.visual_art_medium Condensed Matter::Strongly Correlated Electrons General Materials Science Orthorhombic crystal system |
| Zdroj: | Materials Today Communications. 23:100844 |
| ISSN: | 2352-4928 |
| DOI: | 10.1016/j.mtcomm.2019.100844 |
| Popis: | The Sr2FeNbO6 (SFNO) compound is a material with potential applications to be used as an electrode in solid oxide fuel cells, as well as a photocatalyst material for hydrogen generation. However, there is much controversy on the crystal structure related to this compound. Establishing a crystal structure that correctly describes the electronic and magnetic properties presented by this compound is important to understand the origin of its properties. Theoretical DFT calculations were performed on the cubic, tetragonal, and orthorhombic structure based on the generalized gradient approximation (GGA) and the corrected local density of Hubbard approximation (LDA + U). Our results reveal that the orthorhombic and tetragonal structures are suitable models for reproducing an A-type AFM arrangement and an indirect energy band gap for SFNO in agreement with the reported experimental results if UFe = 10 and 9 eV are used respectively. Meanwhile, the cubic structure does not reproduce the SFNO properties since this modeled structure exhibits a metallic and ferromagnetic behavior. |
| Databáze: | OpenAIRE |
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