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[求助]
请教,如何总Total energy mapping?
如题,今天看文章Ab initio calculations of zirconium adsorption and diffusion on graphene,看到了一幅图,文中图5,附件中图1,这幅图是Zr原子在石墨烯上吸附的Total energy mapping,用于表述扩散壁垒(个人理解),文中提到了如何做这幅图,描述如下:
In these calculations, we fix the coordinates of two C atoms, away from the absorbed Zr atom, in the graphene surface with the previously calculated and relaxed distances. The two fixed atoms neglect the movement of the graphene center-of-mass during relaxations. We relax all the other C atoms. We nullify the forces of the Zr atom in the x and y axes at every step while the z coordinate is relaxed. The total-energy mapping of the Zr atom on a graphene surface is shown in Fig. 5.
这句话的大概意思是:固定住不靠着被吸附原子的C原子,并且固定Zr的x y坐标,只弛豫z坐标,同时,其余的C原子的所有坐标都弛豫?
但是这段话还有不明白的地方,请各位前辈指教:
1. The two fixed atoms neglect the movement of the graphene center-of-mass during relaxations. 这句话是什么意思?什么是center-of-mass???
2. 如何实现:固定住不靠着被吸附原子的C原子,并且固定Zr的x y坐标,只弛豫z坐标,同时,其余的C原子的所有坐标都弛豫?使用Dynamic形式的POSCAR吗?
类似:
C 0 0 0 F F T
C 0.3 0.3 0 T T T
……………
Zr 0.5 0.5 0.1 F F T
这样的一类格式吗???
还是使用什么别的方式做出来?
3. 最后一个问题,所有能量点的数据计算出来之后,如何用origin作图???有些想不出来……
问题比较难,请各位前辈指教,谢谢 ![请教,如何总Total energy mapping?]()
Fig. 1.jpg |
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