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We have employed ab-initio plane-wave pseudopotential density functional theory to calculate the equilibrium lattice parameters, elastic constants, under the hydrostatic pressures from 0 to 100 GPa for P1 -IrB with Pnma space group and P5 -IrB2 with Pmmn structures. Results show that the P1 -IrB structure is stable, and the incompressibility is enhanced with the increase of pressure. And the elastic constants, bulk modulus, shear modulus for P5 -IrB2 structure exhibit the regular changes under the hydrostatic pressures from 0 to 100 GPa. But when the pressure becomes 50 GPa, the Young's modulus and the lattice constant in the direction b for P5 -IrB2 structure will change exceptionally. Results show that both are not of obvious band gaps in P1 -IrB and P5 -IrB2 electronic structures under zero pressure, because of the covalent effect between Ir and B atoms. The analysis of band structure and the figure of density of states for P1 -IrB and P5 -IrB2 indicate that the two kinds of structure have metal properties.
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Keywords:
- P1-IrB /
- P5-IrB2 /
- first-principles /
- mechanical properties
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[1] Teter D M 1998 MRS Bull. 23 22
[2] [3] Liu Y L, Kong F J, Yang B W, Jiang G 2007 Atca Phys. Sin. 56 5413 (in Chinese) [刘以良, 孔凡杰, 杨缤维, 蒋刚 2007 物理学报 56 5413]
[4] [5] Cohen M L 1985 Phys. Rev. B 32 7988
[6] [7] Solozhenko V L, Dubrovinskaia N A, Dubrovinsky L S 2004 Appl. Phys. Lett. 85 1508
[8] Song H, Zhang Y, Chen C F 2005 Physics 34 414 (in Chinese) [孙弘, 张翼, 陈长风 2005 物理 34 414]
[9] [10] Jiang Y L, Zhang B, Pan H 2006 Jiangsu Build. Mater. 1 35 (in Chinese) [姜亚林, 张斌, 潘虎 2006 江苏建材 1 35]
[11] [12] Tian Y J, Xu B, Zhao Z S 2012 Int. J. Refract. Met. Hard Mater. 3 93
[13] [14] Li Q, Wang H, Ma Y M 2009 J. Superhard Mater. 32 192
[15] [16] [17] Sproul W D 1996 Science 273 889
[18] [19] Zhao Y, He D W, Daemen L L, Shen T D, Schwarz R B, Zhu Y, Bish D L, Huang J, Zhang J, Shen G, Qian J, Zerda T W 2002 J. Mater. Res. 17 3139
[20] Solozhenko V L, Kurakevych O O, Andrault D, Godec Y L, Mezouar M 2009 Phys. Rev. Lett. 102 015506
[21] [22] [23] Solozhenko V L, Andrault D, Fiquet G, Mezouar M, David C R 2001 Appl. Phys. Lett. 78 1385
[24] Li Q, Wang M, Artem R O, Cui T, Ma Y M 2009 J. Appl. Phys. 105 053514
[25] [26] [27] Li Q, Wang H, Tian Y J, Xia Y, Cui T 2010 J. Appl. Phys. 108 023507
[28] Li D H, Su W J, Zhu X L 2012 Acta Phys. Sin. 61 023103 (in Chinese) [李德华, 苏文晋, 朱晓玲 2012 物理学报 61 023103]
[29] [30] [31] Zhu X L, Li D H, Cheng X L 2008 Solid State Commun. 147 301
[32] Yao Y S, John S T, Dennis D, Klug 2009 Phys. Rev. B 80 094106
[33] [34] [35] Zhao L K, Zhao E J, Wu Z J 2013 Acta Phys. Sin. 62 046201 (in Chinese) [赵立凯, 赵二俊, 武志坚 2013 物理学报 62 046201]
[36] Zhang X H, Gregory E H, William G, Fahrenholtz 2008 Mater. Lett. 62 4251
[37] [38] Gu Q, Krauss G, Steurer W 2008 Adv. Mater. 20 3620
[39] [40] Rau J V, Latini A 2009 Chem. Mater. 21 1407
[41] [42] Alessandro L, Julietta V Rau, Roberto T, Amanda G, Valerio R A 2010 ACS Appl. Mater. Interfaces 2 581
[43] [44] Zhao W J, Wang Y X J 2009 Solid State Chem. 182 2880
[45] [46] [47] Wang Y, Chen W, Chen X, Liu X H, Dingc Z H 2012 Alloys and Compounds 538 115
[48] Wang D Y, Wang B, Wang Y X 2012 J. Phys. Chem. C 116 21961
[49] [50] Wang Y C, Lv J, Zhu L, Ma Y M 2010 Phys. Rev. B 82 094116
[51] [52] [53] Gui L J, Liu Y L, Wang W T, Zhang Y, Lv G H, Yao J E 2013 Chin. Phys. B 22 106109
[54] Yang C Y, Zhang R 2014 Chin. Phys. B 23 026301
[55] [56] Zhang L, Ji G F, Zhao F, Gong Z Z 2011 Chin. Phys. B 20 047102
[57] [58] [59] Biermann S, Aryasetiawan F, Georges A 2003 Phys. Rev. Lett. 90 086402
[60] Xu G L, Zhu Z H 2008 J. Sichuan Normal University (Natural Science) 31 325 (in Chinese) [徐国亮, 朱正和 2008 四川师范大学学报 31 325]
[61] [62] Tian M F, Deng X Y, Fang Z, Dai X 2011 Phys. Rev. B 84 205124
[63] [64] [65] Segall M D, Lindan P J D, Probert M J, Pickard C J, Hasnip P J, ClarkS J, Payne M C 2002 J. Phys. Condens. Matter 14 2717
[66] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 45 566
[67] [68] [69] Ceperley D M, Alder B J 1980 Phys. Rev. B 45 566
[70] Perdew J P, Burke K, Zunger A 1981 Phys. Rev. B. 23 5048
[71] [72] [73] Vanderbilt D 1990 Phys. Rev. B 41 7892
[74] [75] Monkhorst H J, Pack J D 1977 Phys. Rev. B 13 5188
[76] Pack J D, Monkhorst H J 1977 Phys. Rev. B 16 1748
[77] [78] [79] Peng F, Chen D, Yang X D 2009 Solid State Commun. 149 2135
[80] [81] Wang D Y 2013 M. S. Thesis (Kaifeng:Henan University) (in Chinese) [王德玉2013硕士学位论文(开封: 河南大学)]
[82] [83] [84] [85] [86] [87] [88] [89] [90] [91] [92] [93] [94] [95] [96] [97] [98] [99] [100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] [129] [130] [131] [132] [133] [134] [135] [136] [137] [138] [139] [140] [141] [142] [143] [144] [145] [146] [147] [148] [149] [150] [151] [152] [153] [154] [155] [156] [157] [158] [159] [160] [161]
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