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真的头都炸了,对第一性原理真的懂得不多,翻译不来,希望能有大佬帮助
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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. |
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musapir
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| 本研究中考虑的所有结构都完全放松到所有力都小于0.02 eVÅ为止,在这项研究中,我们使用的U值为3.5 eV,与实验相比,已发现它适合作为锐钛矿晶体的适当描述。大块锐钛矿型TiO2的PBE + U计算的最佳晶格参数为a = b =3.85Å,c =9.72Å。锐钛矿型TiO2(101)表面由三层O-Ti-O层(图6a)沿(001)方向和板间15Å真空厚度建模。除底部O-Ti-O层保持固定以模仿本体结构外,系统中其它所有原子均允许弛豫。在这项工作中,我们还研究了还原的TiO2(101)表面上Ho原子的掺杂。 为了对还原的TiO2(101)表面进行建模,我们通过从系统中除去一个桥接氧或钛原子来创建表面氧空位(VOsur)和次表面空位(VOsub),如图6所示。 总之,为了便于比较,我们使用144个原子超级电池来构建所有的计算模型。此外,超级电池中的一个氧/钛原子被一个钬原子取代,以生成Ho-TiO2系统。 |

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