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[求助]
真的頭都炸了,對第一性原理真的懂得不多,翻譯不來,希望能有大佬幫助
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| All of the structures considered in this study were fully relaxed until all of the forces were <0.02 eVÅ . In this study, we used a U value of 3.5 eV, which has been found to be suitable as a proper description of the anatase crystal compared with experiments . The PBE + U-computed optimal lattice parameters for bulk anatase TiO2 were a = b = 3.85Å, c = 9.72Å . The anatase TiO2(101) surface was modelled with three O-Ti-O layers (Fig. 6a) along the (001) direction and a 15Å vacuum thickness between the slabs. All of the atoms in the system were allowed to relax, except for the bottom O-Ti-O layer, which was kept fixed to mimic the bulk structure. In this work we also studied the doping of a Ho atom on a reduced TiO2(101) surface. To model the reduced TiO2(101) surface, we created a surface oxygen vacancy (VOsur) and a subsurface vacancy (VOsub) by removing one bridging oxygen or titanium atom from the system, as depicted in Fig. 6. In conclusion, for the sake of comparison, 144-atom supercells were used to construct all of the calculation models. In addition, one oxygen/titanium atom in the supercell was replaced by a holmium atom to generate a Ho-TiO2 system. |
木蟲 (正式寫手)
| 本研究中考慮的所有結構都完全放松到所有力都小于0.02 eVÅ為止,在這項研究中,我們使用的U值為3.5 eV,與實驗相比,已發(fā)現(xiàn)它適合作為銳鈦礦晶體的適當描述。大塊銳鈦礦型TiO2的PBE + U計算的最佳晶格參數為a = b =3.85Å,c =9.72Å。銳鈦礦型TiO2(101)表面由三層O-Ti-O層(圖6a)沿(001)方向和板間15Å真空厚度建模。除底部O-Ti-O層保持固定以模仿本體結構外,系統(tǒng)中其它所有原子均允許弛豫。在這項工作中,我們還研究了還原的TiO2(101)表面上Ho原子的摻雜。 為了對還原的TiO2(101)表面進行建模,我們通過從系統(tǒng)中除去一個橋接氧或鈦原子來創(chuàng)建表面氧空位(VOsur)和次表面空位(VOsub),如圖6所示。 總之,為了便于比較,我們使用144個原子超級電池來構建所有的計算模型。此外,超級電池中的一個氧/鈦原子被一個鈥原子取代,以生成Ho-TiO2系統(tǒng)。 |

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