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Cu-Zr alloy system,as a representative of transition metal-transition metal (TM-TM) metallic glass (MG),has attracted considerable attention due to its high glass-forming ability in a wide range of compositions.Many researchers have realized that the GFA of Cu-Zr alloy is intimately related to Cu-centered Cu-Zr icosahedral atomic cluster in supercooled liquid and rapidly solidified into amorphous solid.And lots of molecular dynamics simulations have shown that Cu-centered Cu-Zr icosahedral clusters not only affect the thermo-dynamical properties of metal or alloy melts,but also exhibit excellent structural stability and configuration heredity ability during the rapid solidification.Hereof a model of the metallic glass structure based on like icosahedron has become widely accepted,which plays an important role in the glass transition and its strong kinetic constraint on nucleation.However,though more and more standard and distorted Cu-Zr icosahedral clusters have been found and reported in Cu-Zr metallic glass,the fundamental understanding of these Cu-Zr icosahedral clusters of MGs is still lacking.More essential properties of Cu-centered Cu-Zr icosahedral cluster, especially on the electronic structure are still unclear.Based on this,as a further step towards in depth understanding the electronic structures of those icosahedral clusters,we will investigate the electronic structures of the stable Cucentered CunZr13-n (n=6,7,8,9) icosahedral clusters in this work,and consider all the possible atomic configurations for given chemical composition in view of originate in theory And a DMol3 molecular orbital package based on density functional theory (DFT) is adopted to calculate the energetics and electronic structures of Cu-centered Cu-Zr icosahedral clusters.During optimization and total energy calculation,electronic exchange-correlation energy functions in reciprocal space with the Perdew-Burke-Emzerhof type under general gradient approximate are used.A double-numerical basis set together with d-polarization functions (DNP) is chosen to describe the electronic wave functions of Cu and Zr atoms. And only core electrons described by the DFT Semi-core Pseudopots are calculated.All atomic positions in Cu-centered CunZr13-n (n=6,7,8,9) icosahedral clusters are relaxed by geometry optimization under a root mean square (RMS) force of 0.002 Ha/ and RMS displacement of 0.005 .The calculations of total energy and electronic structure are followed by the geometry optimization with self-consistent field tolerance of 110-5 Ha.It is found that homogeneous atoms in the shell of clusters with low binding energy prefer to bond to each other.In this case,the results of electronic structures reveal this segregation at low energy and stable configurations can be attributed to their low N (EF) at EF to some extent.A further analysis of Mulliken'population shows that these 4s and 4p of shell Cu atoms are all donees in the formation of icosahedral cluster,different from the donations of 3d and 4s of core Cu atoms and 5s of shell Zr atoms, and this charge transfer tendency does not change with order parameter nor chemical composition of Cu-centered Cu-Zr icosahedral cluster.In addition,calculating the infrared vibration spectrum of Cu-Zr icosahedral cluster is a new idea for accurately characterizing the cluster structure.
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[3] Cheng Y Q, Ma E 2011 Prog. Mater. Sci. 56 379
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[11] Wen D D, Peng P, Jiang Y Q, Tian Z A, Liu R S 2013 Acta Phys. Sin. 62 196101 (in Chinese) [文大东, 彭平, 蒋元祺, 田泽安, 刘让苏 2013 物理学报 62 196101]
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[14] Deng Y H, Wen D D, Peng C, Wei Y D, Zhao R, Peng P 2016 Acta Phys. Sin. 65 066401 (in Chinese) [邓永和, 文大东, 彭超, 韦彦丁, 赵瑞, 彭平 2016 物理学报 65 066401]
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[20] Sha Z D, Pan H, Pei Q X, Zhang Y W 2012 Intermetallics 26 8
[21] Jiang Y Q 2015 Ph. D. Dissertation (Changsha: Hunan University) (in Chinese) [蒋元祺 2015 博士学位论文 (长沙: 湖南大学)]
[22] Sha Z D, Pei Q X 2015 J. Alloys Compd. 619 16
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[26] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
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[28] Moruzzi V L, Oelhafen P, Williams A R 1983 Phys. Rev. B 27 7194
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[31] Mulliken R S 1955 J. Chem. Phys. 23 1841
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[33] Peng L, Peng P, Wen D D, Liu Y G, Wei H, Sun X F, Hu Z Q 2011 Modell. Simul. Mater. Sci. Eng. 19 065002
[34] Segall M D, Pickard C, Shah J R, Payne M C 2010 Mol. Phys. 89 571
[35] Ohmura S, Shimojo F 2010 Phys. Rev. B. 81 014208
[36] Segall M D, Shah R, Pickard C J, Payne M C 1996 Phys. Rev. B 54 16317
[37] Yang L, Ge T, Guo G Q, Huang C L, Meng X F, Wei S H, Chen D, Chen L Y 2013 Intermetallics 34 106
[38] Zhao L Z, Ma C L, Fu M W, Zeng X R 2012 Chem.Phys. Lett. 549 44
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[1] Klement W, Wiliens R H, Duwez P 1960 Nature 187 870
[2] Wang W H 2013 Prog. Phys. 33 177 (in Chinese) [汪卫华 2013 物理学进展 33 177]
[3] Cheng Y Q, Ma E 2011 Prog. Mater. Sci. 56 379
[4] Jiang Y Q, Peng P, Wen D D, Han S C, Hou Z Y 2015 Comput. Mater. Sci. 99 156
[5] Li M Z 2017 Acta Phys. Sin. 66 176107 (in Chinese) [李茂枝 2017 物理学报 66 176107]
[6] Jiang Y Q, Wen D D, Peng P 2017 J. Molec. Liquids 230 271
[7] Hirata A, Kang L J, Fujita T, Klumov B, Matsue K, Kotani M, Yavari A R, Chen M W 2013 Science 341 376
[8] Yang L, Guo G Q, Chen L Y, Huang C L, Ge T, Chen D, Liaw P K, Saksl K, Ren Y, Zeng Q S, LaQua B, Chen F G, Jiang J Z 2012 Phys. Rev. Lett. 109 105502
[9] Shen Y T, Kim T H, Gangopadhyay A K, Kelton K F 2009 Phys. Rev. Lett. 102 057801
[10] Sheng H W, Luo W K, Alamgir F M, Bai J M, Ma E 2006 Nature 439 419
[11] Wen D D, Peng P, Jiang Y Q, Tian Z A, Liu R S 2013 Acta Phys. Sin. 62 196101 (in Chinese) [文大东, 彭平, 蒋元祺, 田泽安, 刘让苏 2013 物理学报 62 196101]
[12] Hwang J, Melgarejo Z H, Kalay Y E, Kalay I, Kramer M J, Stone D S, Voyles P M 2012 Phys. Rev. Lett. 108 195505
[13] Lee M, Lee M, Lee C, Lee K, Ma E, Lee J 2011 Acta Mater. 59 159
[14] Deng Y H, Wen D D, Peng C, Wei Y D, Zhao R, Peng P 2016 Acta Phys. Sin. 65 066401 (in Chinese) [邓永和, 文大东, 彭超, 韦彦丁, 赵瑞, 彭平 2016 物理学报 65 066401]
[15] Leocmach M, Tanaka H 2012 Nat. Commun. 3 974
[16] Wen D D, Peng P, Jiang Y Q, Tian Z A, Liu R S, Dong K J 2014 J. Non-Cryst. Solids 388 75
[17] Liu A C Y, Neish M J, Stokol G, Buckley G A, Smillie L A, de Jonge M D, Ott R T, Kramer M J, Bourgeois L 2013 Phys. Rev. Lett. 110 205505
[18] Lekka C E, Evangelakis G A 2009 Scripta Mater. 61 974
[19] Bokas G B, Lagogianni A E, Almyras G A, Lekka Ch E, Papageorgiou D G, Evangelakis G A 2013 Intermetallics 43 138
[20] Sha Z D, Pan H, Pei Q X, Zhang Y W 2012 Intermetallics 26 8
[21] Jiang Y Q 2015 Ph. D. Dissertation (Changsha: Hunan University) (in Chinese) [蒋元祺 2015 博士学位论文 (长沙: 湖南大学)]
[22] Sha Z D, Pei Q X 2015 J. Alloys Compd. 619 16
[23] Wang D, Zhao S J, Liu L M 2015 J. Phys. Chem. A 119 806
[24] Delley B 2000 J. Chem. Phys. 113 7756
[25] Delley B 1990 J. Chem. Phys. 92 508
[26] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[27] Nagel S R, Tauc J 1975 Phys. Rev. Lett. 35 380
[28] Moruzzi V L, Oelhafen P, Williams A R 1983 Phys. Rev. B 27 7194
[29] Goldberg A, Halls M D, Kung P, Liang J J 2009 J. Phys. B: Atomic, Molecular and Optical Physics 42 125103
[30] Mulliken R S 1955 J. Chem. Phys. 23 1833
[31] Mulliken R S 1955 J. Chem. Phys. 23 1841
[32] Mulliken R S 1962 J. Chem. Phys. 36 3428
[33] Peng L, Peng P, Wen D D, Liu Y G, Wei H, Sun X F, Hu Z Q 2011 Modell. Simul. Mater. Sci. Eng. 19 065002
[34] Segall M D, Pickard C, Shah J R, Payne M C 2010 Mol. Phys. 89 571
[35] Ohmura S, Shimojo F 2010 Phys. Rev. B. 81 014208
[36] Segall M D, Shah R, Pickard C J, Payne M C 1996 Phys. Rev. B 54 16317
[37] Yang L, Ge T, Guo G Q, Huang C L, Meng X F, Wei S H, Chen D, Chen L Y 2013 Intermetallics 34 106
[38] Zhao L Z, Ma C L, Fu M W, Zeng X R 2012 Chem.Phys. Lett. 549 44
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