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- W2938382602 abstract "Abstract The orbital selective external potential (OSEP) method, recently developed by the authors, allows the energy level of a specific atomic orbital to be shifted, thus allowing for the identification of the role of this orbital in the chemical and physical properties of the system. Using OSEP, the origins of ferroelectricity in two classic ferroelectric perovskites, BaTiO 3 and PbTiO 3 , are systematically revisited. The fact that the hybridization between the Ti 3d state and the O 2p state is essential for the formation of ferroelectricity in both BaTiO 3 and PbTiO 3 is reproduced, which validates this method. Particularly, for PbTiO 3 , the Pb 6s lone‐pair electron states can also be tuned using the OSEP method, and its influence on the ferroelectricity is unveiled in detail. Surprisingly, it is found that the electric dipoles formed by lone‐pair lobes contribute only slightly to the overall ferroelectric polarization, whereas the concomitant ionic displacements and lattice distortions are prominently favorable for ferroelectricity. Indeed, it is found that the Pb–O hybridization plays an important role in the ferroelectricity of PbTiO 3 , which makes the polarization of PbTiO 3 significantly larger than that of BaTiO 3 . This study provides a simple yet straightforward way to demonstrate the mechanisms of ferroelectricity in perovskite oxides, which can be applied to the study of ferroelectric mechanism in other relevant materials." @default.
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- W2938382602 date "2019-04-15" @default.
- W2938382602 modified "2023-10-17" @default.
- W2938382602 title "Role of Lone‐Pairs in Driving Ferroelectricity of Perovskite Oxides: An Orbital Selective External Potential Study" @default.
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- W2938382602 doi "https://doi.org/10.1002/adts.201900029" @default.
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