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http://hdl.handle.net/10773/19459
Title: | First principles simulation of temperature dependent electronic transition of FM-AFM phase BFO |
Author: | Bian, Liang Xu, Jin-bao Song, Mian-xin Dong, Fa-qin Dong, Hai-liang Shi, Fa-Nian Zhang, Xiao-Yan Duan, Tao |
Keywords: | MULTIFERROIC BIFEO3 ROOM-TEMPERATURE MAGNETIC-PROPERTIES NANOPARTICLES FILMS 1ST-PRINCIPLES POLARIZATION DYNAMICS |
Issue Date: | 2015 |
Publisher: | SPRINGER |
Abstract: | 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 similar to 1500 K). The results suggest that the heat accumulation accelerates the O-2p(4) orbital splitting, inducing the Fe3+-3d(5) -> Fe2+-3d(5)d(0) 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+-3d(5), in comparison to the O -> Bi-6p(3)+ Fe3+-3d(5)d(0) 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/10773/19459 |
DOI: | 10.1007/s00894-015-2583-7 |
ISSN: | 1610-2940 |
Publisher Version: | 10.1007/s00894-015-2583-7 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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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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