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| 【獎(jiǎng)勵(lì)】 本帖被評(píng)價(jià)6次,作者zrfssh增加金幣 5.5 個(gè) | ||||
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zrfssh木蟲(chóng) (小有名氣)
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[資源]
【分享】Calculation of Ideal strength by ab initio DFT
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采用第一性原理計(jì)算力學(xué)性質(zhì)一直僅限于彈性常數(shù)等近于平衡的物性的計(jì)算。最近關(guān)于理想強(qiáng)度的計(jì)算得到了進(jìn)一步的發(fā)展,比如說(shuō)以下參考文獻(xiàn) (最近,只要配合晶體學(xué)投影或者重新定義晶體取向方法,各向異性的力學(xué)強(qiáng)度可以很方便的計(jì)算出來(lái))。本人覺(jué)得大家可能會(huì)對(duì)其感興趣。 Ideal Shear Strengths of fcc Aluminum and Copper D. Roundy, C. R. Krenn, Marvin L. Cohen, and J. W. Morris Physical Review Letters 82 2713 (1999) The ideal strength of tungsten [Inspec] D. Roundy, C. R. Krenn, Marvin L. Cohen, and J. W. Morris Philos. Mag. A 81, 1725 (2001). Zhang, R. F., Sheng, S. H. and Veprek, S. (2007): Mechanical strengths of silicon nitrides studied by ab initio calculations, Appl. Phys. Lett. 90, 191903. Zhang, R. F., Sheng, S. H. and Veprek, S. (2007): First principles studies of ideal strength and bonding nature of AlN polymorphs in comparison to TiN, Appl. Phys. Lett. 91, 031906. [ Last edited by wuchenwf on 2009-6-13 at 23:03 ] |
VASP blabla | 我的分享 |
木蟲(chóng) (小有名氣)
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關(guān)于術(shù)語(yǔ)(比如ab initio)的應(yīng)用有時(shí)確實(shí)令人為難。在計(jì)算化學(xué)領(lǐng)域,對(duì)于如何區(qū)分ab initio,first principles 和density functional theory 的討論確實(shí)很多,不同觀(guān)點(diǎn)也很明顯。 比如Prof. Hafner 研究組(VASP) 就將Hartree-Fock看作一種DFT 參照Hafner, J. J Comput Chem 2008, 29, 2044., ...the implementation of various DFT functionals [local-density approximation (LDA), generalized gradient approximation (GGA), meta-GGA, hybrid functional mixing DFT, and exact (Hartree-Fock) exchange] and post-DFT approaches [DFT + U for strong electronic correlations ... 其文章廣泛使用ab initio ...However, even with the radical simplification introduced by DFT, ab initio calculations for solids were restricted, for a long time, to simple systems with small unit cells... ...VASP is a plane-wave code for ab-initio density-functional calculations... 而M C Prof. Payne (CASTEP) 對(duì)區(qū)別很明確J. Phys.: Condens. Matter 14 (2002) 2717–2744), ..First-principles simulation, meaning density-functional theory calculations with plane waves and pseudopotentials, has become a prized technique in condensed-matter theory... 詳細(xì)介紹參照各自的文章。本人不敢妄加判斷誰(shuí)對(duì)誰(shuí)錯(cuò),這里貼出各自不同觀(guān)點(diǎn)供大家參考,根據(jù)情況還是自己判斷吧 ![]() [ Last edited by zrfssh on 2009-10-23 at 17:10 ] |
金蟲(chóng) (初入文壇)
鐵桿木蟲(chóng) (著名寫(xiě)手)
| 我也正在做這方面的工作,但是計(jì)算結(jié)果不對(duì)。主要是晶體學(xué)投影或者重新定義晶體取向方法不太明白,不知道可否提供些資料看看,謝謝!郵箱是ejzhao@ciac.jl.cn |
木蟲(chóng) (小有名氣)



















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