| 查看: 6390 | 回复: 16 | ||||
| 【奖励】 本帖被评价6次，作者zrfssh增加金币 5.5 个 | ||||
| 当前主题已经存档。 | ||||
[资源]
【分享】Calculation of Ideal strength by ab initio DFT
|
||||
|
采用第一性原理计算力学性质一直仅限于弹性常数等近于平衡的物性的计算。最近关于理想强度的计算得到了进一步的发展，比如说以下参考文献 （最近，只要配合晶体学投影或者重新定义晶体取向方法，各向异性的力学强度可以很方便的计算出来）。本人觉得大家可能会对其感兴趣。 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 ] |
回复此楼» 收录本帖的淘帖专辑推荐
 VASP blabla | 我的分享 |
» 猜你喜欢
写了一篇“相变储能技术在冷库中应用”的论文，论文内容以实验为主，投什么期刊合适？
已经有6人回复
-
带资进组求博导收留
已经有10人回复
-
最近几年招的学生写论文不引自己组发的文章
已经有11人回复
-
需要合成515-64-0，50g，能接单的留言
已经有3人回复
-
中科院杭州医学所招收博士生一名（生物分析化学、药物递送）
已经有3人回复
-
临港实验室与上科大联培博士招生1名
已经有8人回复
-
想换工作。大多数高校都是 评职称时 认可5年内在原单位取得的成果吗？
已经有4人回复
★
zeoliters(金币+1,VIP+0):谢谢讨论！ 10-21 19:59
zeoliters(金币+1,VIP+0):谢谢讨论！ 10-21 19:59
| 我也正在做这方面的工作，但是计算结果不对。主要是晶体学投影或者重新定义晶体取向方法不太明白，不知道可否提供些资料看看，谢谢！邮箱是ejzhao@ciac.jl.cn |
3楼2008-12-20 20:01:54
2楼2008-12-20 17:51:14
5楼2008-12-21 06:00:55
6楼2008-12-21 17:30:54
7楼2009-06-13 22:02:48
8楼2009-06-17 16:26:02
10楼2009-10-19 22:09:33
12楼2009-10-20 05:55:18
★ ★
zeoliters(金币+2,VIP+0):谢谢回帖讨论！ 10-21 20:00
zeoliters(金币+2,VIP+0):谢谢回帖讨论！ 10-21 20:00
|
DFT 是密度泛函理论，不知楼上的想阐明什么 如下摘自http://en.wikipedia.org/wiki/Computational_chemistry Density functional theory (DFT) methods are often considered to be ab initio methods for determining the molecular electronic structure, even though many of the most common functionals use parameters derived from empirical data, or from more complex calculations. In DFT, the total energy is expressed in terms of the total one-electron density rather than the wave function. 下面是ab initio 的介绍 From Wikipedia, the free encyclopedia 参照http://en.wikipedia.org/wiki/Ab_initio_quantum_chemistry_methods The Latin term ab initio means from the beginning and is used in several contexts， Ab initio quantum chemistry methods are computational chemistry methods based on quantum chemistry.[1] The term ab initio indicates that the calculation is from first principles and that no empirical data is used. Robert Parr claims in an interview that the term was first used in a letter to him by David Craig and was put into the manuscript of their paper on the excited states of benzene published in 1950.[2] [3] The simplest type of ab initio electronic structure calculation is the Hartree–Fock (HF) scheme, in which the instantaneous Coulombic electron-electron repulsion is not specifically taken into account. [ Last edited by zrfssh on 2009-10-21 at 22:48 ] |
13楼2009-10-21 22:42:33
14楼2009-10-22 03:10:13
15楼2009-10-22 14:22:24
16楼2009-10-23 02:51:40
|
关于术语（比如ab initio）的应用有时确实令人为难。在计算化学领域，对于如何区分ab initio，first principles 和density functional theory 的讨论确实很多，不同观点也很明显。 比如Prof. Hafner 研究组(VASP） 就将Hartree-Fock看作一种DFT 参照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 ... 其文章广泛使用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) 对区别很明确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... 详细介绍参照各自的文章。本人不敢妄加判断谁对谁错，这里贴出各自不同观点供大家参考，根据情况还是自己判断吧  [ Last edited by zrfssh on 2009-10-23 at 17:10 ] |
17楼2009-10-23 17:03:49
简单回复
fegg75024楼
2008-12-20 21:22
回复
2009-10-19 16:23
回复
mingdong11楼
2009-10-19 23:07
回复
