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論文名稱 Title |
BC2N的原子結構與力學性質 Atomic structure and mechanical properties of of BC2N |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
42 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2010-05-28 |
繳交日期 Date of Submission |
2010-07-06 |
關鍵字 Keywords |
貪婪演算法 greedy algorithm, first principle, BC2N |
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統計 Statistics |
本論文已被瀏覽 5717 次,被下載 1045 次 The thesis/dissertation has been browsed 5717 times, has been downloaded 1045 times. |
中文摘要 |
基於貪婪演算法的系統化搜尋發現 BC2N 超晶格的結構排列。使用樹狀資料結構, 我們已經獲得先前 Sun 等人發現的七種 c-BC2N 1x1x1 晶格的原子結構 [Phys. Rev. B 64, 094108 (2001)]。 而且, 將貪婪演算法應用在樹狀資料結構上, 發現在 c-BC2x2x2 , 3x3x3, 和4x4x4的超晶格上擁有最大數目碳-碳鍵結的原子結構。這些新的結構排列仍未被之前的文獻提出。在 c-BC2N 超晶格上已經搜索到512顆原子。這些原子在超晶格上的位置皆為類鑽石結構形式。並且碳原子與硼、氮原子分別形成八面體的結構。這些碳原子構成的八面體結構被{111}面所包圍著,同時每個面和鄰近硼與氮原子所構成的八面體接觸。新發現的低能量結構的電性與力學也已被分析。 |
Abstract |
Structural motifs for the BC2N superlattices were identified from a systematic search based on a greedy algorithm. Using a tree data structure, we have retrieved seven structural models for c-BC2N 1x1x lattice which were identified previously by Sun et al. [Phys. Rev. B 64, 094108 (2001)]. Furthermore, the atomic structures with the maximum number of C-C bonds for c-BC2N 2x2x2, 3x3x3, and 4x4x4 superlattices were found by imposing the greedy algorithm in the tree data structure. This new structural motif has not been previously proposed in the literature. A total of up to 512 atoms in the c-BC2N superlattice are taken into consideration. The atoms in these superlattices are in diamond-like structural form. Furthermore, the C atoms, as well as B and N atoms, form the octahedral motif separately. The octahedral structure consisting of C is bounded with {111} facets, and each facet is interfaced to a neighboring octahedral structure consisting of B and N atoms. The electronic and mechanical properties of newly identified low energy structures were analyzed. |
目次 Table of Contents |
摘要 i ABSTRACT ii LIST OF FIGURES v LIST OF TABLES vi 1 Introduction 1 2 Theory 3 2.1 Born-Oppenheimer approxmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Density functional theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2.1 Thomas-Fermi model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2.2 Honhenberg-Kohn theorem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.3 Kohn-Sham equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.4 Exchange-correlation energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Psuedopotential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.1 Norm-Conserving pseudopotential . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3.2 Project augmented plane wave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 Geometry optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.4.1 Hellman-Feynman theorem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.4.2 Linear search . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.5 Struactural searach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.5.1 Tree structure and greedy algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.5.2 Choice of fitness function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.5.3 Structural comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.6 Computational details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3 Results and discussions 19 3.1 Structural models and energetics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2 X-ray diffraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.3 Ideal strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4 Conclusions 30 References 31 |
參考文獻 References |
[1] E. Knittle, R. B. Kaner, R. Jeanloz, and M. L. Cohen, Phys. Rev. B 51, 12149 (1995). [2] H. Sun, Seung-Hoon Jhi, D. Roundy, M. L. Cohen, and S. G. Louie, Phys. Rev. B 64, 094108 (2001). [3] V. L. Solozhenko, D. Andrault, G. Fiquet, M.Mezouar, and D. C. Rubie, Appl. Phys. Lett. 78, 1385 (2001). [4] S. N. Tkachev, V. L. Solozhenko, P. V. Zinin, M. H.Manghnani, and L. C.Ming, Phys. Rev. B 68, 052104 (2003). [5] E. Kim, T. Pang,W.Utsumi, V. L. Solozhenko, and Y. Zhao, Phys. Rev. B 75, 184115 (2007). [6] W. Utsumi, S. Nakano, K. Kimoto, T. Okada, M. Isshiki, T. Taniguchi, K. Funakoshi, M. Akaishi, and O. Shimomura, Proceedings of AIRAPT-18, Beijing, China, 2001 (unpublished), p. 186. [7] Y. Zhao, D.W. He, L.L. Daemen, T.D. Shen, R. B. Schwarz, Y. Zhu, D. L. Bish, J. Huang, J.Zhang, G.Shen, J. Qian, and T.W. Zerda, J.Mater. Res. 17, 3139(2002). [8] T. Komatsu, M. Nomura, Y. Kakudate, and S. Fujiwara, J.Mater. Chem. 6, 1799 (1996). [9] H. Dong, D. He, T. S. Duffy, and Y. Zhao, Phys. Rev. B 79, 014105 (2009). [10] S. Nakano, M. Akaishi, T. Sasaki, and S. Yamaoka, Chem.Mater. 6, 2246 (1994). [11] S. Nakano, M. Akaishi, and T. Sasaki, Chem.Mater. 13, 350 (2001). [12] V. L. Solozhenko, S. N. Dub, and N. V. Novikov, Diamond Relat.Mater. 10, 2228 (2001). [13] Z. C. Pan, H. Sun, and C. F. Chen, Phys. Rev. Lett. 98, 135505 (2007). [14] S. Chen, X. G. Gong, and S.H.Wei, Phys. Rev. Lett. 98, 015502 (2007). [15] X. Luo, X. Guo, B. Xu, Q. Wu, Q. Hu, Z. Liu, J. He, D. Yu, Y. Tian, and H. T. Wang, Phys. Rev. B 76, 094103 (2007). [16] Quan Li, Mei Wang, Artem R. Oganov, Tian Cui, Yanming Ma, and Guangtian Zou, J. Appl. Phys. 105, 053514 (2009). [17] J.Maddox, Nature 335 201 (1988). [18] A. R. Oganov and C.W. Glass, J. Chem. Phys. 124, 244704 (2006). [19] X.F. Fan, H.Y. Wu, Z.X. Shen, Jer-Lai Kuo, Diamond and Related Materials, 18, 1278, (2009). [20] N. L. Abraham and M.I.J. Probert, Phys. Rev. B 73, 224104 (2006). [21] N. L. Abraham and M.I.J. Probert, Phys. Rev. B 77, 134117 (2008). [22] Volker Blum, Gus L. W. Hart, Michael J. Walorski, and Alex Zunger, Phys. Rev. B 72, 165113 (2005). [23] Giancarlo Trimarchi, Arthur J. Freeman, and A. Zunger, Phys. Rev. B 80, 092101 (2009). [24] Laura Filion andMarjolein Dijkstra, Phys. Rev. E 79, 046714 (2009). [25] Yansun Yao, John S. Tse, and Kaori Tanaka, Phys. Rev. B 77, 052103 (2008). [26] Scott M.Woodley and Richard Catlow, NatureMaterials 7, 937(2008). [27] TL Chan, CV. Ciobanu, F.-C. Chuang, N. Lu, C.-Z.Wang and K.-M. Ho, Nano Letters 6(2) 277 (2006). [28] N. Lu, C.V. Ciobanu, T.L. Chan, F.C. Chuang, C.Z.Wang, and K.M.Ho, Journal of Physical Chemistry C 111, 7933 (2007). [29] Nathan Luke Abraham, Ph. D thesis, A Genetic Algorithm for Crystal Structure Prediction, Ch. 7, (2006). [30] M. Born and J. R. Oppenheimer, Ann. Physik, 84, 457 (1927). [31] L. H. Thomas, Proc. Cambridge Phil. Roy. Soc. 23, 542 (1927). [32] E. Fermi, Rend. Accad. Naz. Lincei, 6, 602 (1927). [33] P. A. M. Dirac, Proc. Cambridge Phil. Roy. Soc. 26, 376 (1930). [34] E. Teller, Rev.Mod. Phys. 34, 627 (1962). [35] N. L. Balazs, Phys. Rev. 156, 42 (1967). [36] P. Hohenberg andW. Kohn, Phys. Rev. 136, B864 (1964). [37] W. Kohn and L. J. Sham, Phys. Rev. 140, A1135 (1965). [38] D. R. Hamann, M. Schluter, and C. Chiang, Phys. Rev. Lett. 43, 1494 (1979). [39] P. E. Blochl, Phy. Rev. B. 50, 17953 (1994). [40] R. P. Feynman, Phys. Rev. 56, 340 (1939). [41] Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein, Introduction to Algorithms 2nd. edition, The MIT Press (2001). [42] D.M. Ceperley and B. J. Alder, Phys. Rev. Lett. 45 566 (1980). [43] J. P. Perdew and A. Zunger, Phys. Rev. B 23, 5048 (1981). [44] J. P. Perdew, K. Burke, and M. Ernzerhof, Phys. Rev. Lett. 77, 3865 (1996). [45] G. Kresse and D. Joubert, Phys. Rev. B 59, 1758 (1999). [46] G. Kresse and J. Hafner, Phys. Rev. B 47, 558 (1993); G. Kresse and J. Furthmuller, Phys. Rev. B 54, 11169 (1996). [47] H. J.Monkhorst and J. D. Pack, Phys. Rev. B 13, 5188 (1976). [48] D.M. Deaven, K.M. Ho, Phys. Rev. Lett. 75, 288 (1995). [49] K.M. Ho, A.A. Shvartsburg, B.C. Pan, Z.Y. Lu, C.Z. Wang, J. Wacker, J.L. Fye, and M.F. Jarrold, Nature 392 582 (1998). [50] F.-C. Chuang, C.Z.Wang, and K.M. Ho, Phys. Rev. B 73 125431 (2006). [51] F.-C. Chuang, Cristian V. Ciobanu, V. B. Shenoy, Cai-Zhuang Wang, and Kai-Ming Ho, Surf. Sci. Lett. 573, L375 (2004). [52] 20. F.-C. Chuang, B. Liu, C.Z. Wang, T.L. Chan and K.-M. Ho, Surf. Sci. Lett. 598 L339 (2005). [53] Diamond Demonstration Version 3.2c is publised by CRYSTAL IMPACT. [54] Y. Zhang, H. Sun, and C. Chen, Phys. Rev. Lett. 93, 195504 (2004). [55] D. Roundy, C. R. Krenn, Marvin L. Cohen, and J. W. Morris, Phys. Rev. Lett. 82, 2713 (1999). [56] D. Roundy, C. R. Krenn,Marvin L. Cohen, and J.W.Morris Jr, PhilosophicalMagazine A 81, 1725-1747 (2001). [57] Faming Gao, Julong He, Erdong Wu, Shimin Liu, Dongli Yu, Dongchun Li, Siyuan Zhang, and Yongjun Tian, Phys. Rev. Lett. 91, 015502 (2003). [58] A. Simunek and J. Vackar, Phys. Rev. Lett. 96, 085501 (2006). |
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