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xxinusa

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[求助] 关于形成能的计算 已有1人参与

求大神指教“Simultaneous phase and size control of upconversion nanocrystals through lanthanide doping”文献中关于形成能的计算,在VASP中的具体计算步骤?
To shed more light on the effect of lanthanide doping, we performed first principles calculations based on density functional theory (DFT) for ground-state geometry and formation energy of NaYF4 and NaGdF4 nanocrystals in both cubic and hexagonal phases (Supplementary Fig. 1). The DFT calculations include the generalized gradient approximation, using a plane wave basis (kinetic energy cut-off 400 eV) and projector augmented-wave pseudo potential. The formation energy is defined as the energy difference per unit cell between the nanocrystal and isolated atoms. In cubic phase, the formation energy per atom decreases by about 0.07 eV when Y31 is replaced by Gd31, representing the fact that NaYF4 is more energetically stable than NaGdF4 in cubic phase. In contrast, the formation energy per atom in hexagonal phase increases by about 0.07 eV when Y31 is replaced by Gd31, indicating that NaGdF4 is more energetically stable than NaYF4 in hexagonal phase.
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dengc09

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6楼2015-06-19 14:17:30
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dengc09

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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
xxinusa: 金币+10, ★★★很有帮助, xx 2015-06-26 15:43:39
xxinusa: 金币+10, 有帮助 2015-11-06 09:13:58
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2楼2015-06-19 10:26:15
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xxinusa

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引用回帖:
2楼: Originally posted by dengc09 at 2015-06-19 10:26:15
The formation energy is defined as the energy difference per unit cell between the nanocrystal and isolated atoms. 文中给出形成能定义了,你分别计算单胞能量和各种孤立原子能量再做差就能算出来啊

请问一下,这个形成能和表面能有啥不一样,是值越大越稳定吗?
3楼2015-06-19 10:49:33
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dengc09

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4楼2015-06-19 11:47:05
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