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http://hdl.handle.net/10773/17629
Título: | First principles simulation of temperature dependent electronic transition of FM-AFM phase BFO |
Autor: | Bian, Liang Xu, Jin-Bao Song, Mian-Xin Dong, Fa-Qin Dong, Hai-Liang Shi, Fa-Nian Zhang, Xiao-Yan Duan, Tao |
Palavras-chave: | Bismuth ferrite Density functional theory Temperature dependent Two-dimensional correlation analysis |
Data: | 2015 |
Editora: | Springer |
Resumo: | Understanding how temperature affects the electronic transitions of BFO is important for design of BiFeO3 (BFO)-based temperature-sensitive device. Hitherto, however, there have been only very limited reports of the quantitative simulation. Here, we used density functional theory (DFT) and two-dimensional correlation analysis (2D-CA) techniques to calculate the systematic variations in electronic transitions of BFO crystal, over a range of temperature (50~1500 K). The results suggest that the heat accumulation accelerates the O-2p4 orbital splitting, inducing the Fe3+-3d5→Fe2+-3d5d0 charge disproportionation. The origin is observed as the temperature-dependent electron transfer process changes from threefold degeneracy to twofold degeneracy. Additionally, the crystallographic orientation (111) can be used to control the 2p-hole-induced electronic transition as O→unoccupied Fe3+-3d5, in comparison to the O→Bi-6p3+Fe3+-3d5d0 on the orientations (001) and (101). This study offers new perspective on the improvement of BFO-based temperature-sensitive device. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/17629 |
DOI: | 10.1007/s00894-015-2583-7 |
ISSN: | 0948-5023 |
Aparece nas coleções: | CICECO - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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First principles simulation of temperature dependent electronic transition of FM-AFM phase BFO_10.1007s00894-015-2583-7.pdf | 2.68 MB | Adobe PDF |
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