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7.28】Prof. Artem R. Oganov
Topic: Crystal structure ...
 
2012-07-09 | 文章来源:材料加工模拟研究部        【 】【打印】【关闭

Topic: Crystal structure prediction and computational materials discovery

Speaker: Prof. Artem R. Oganov

     Department of Geosciences and Department of Physics and Astronomy,

     State University of New York, Stony Brook, NY 11794-2100

Time: 14:30 PM, Saturday, July 28, 2012

Venue: Room 408, R & D center, IMR CAS

welcome to attend!

Abstract

While most of the known materials have been discovered through experiments, one wonders if theory will ever become capable of leading materials discovery. The evolutionary methodology USPEX [1] has been a major step towards this goal as it provides, given just the chemical composition and pressure/temperature conditions, the stable structure and a set of low-energy metastable structures. Some of the applications are: 1) New stable high-pressure phase of boron, γ-B28 [2]. This superhard phase shows a surprising degree of charge transfer between boron sites, which affects many physical properties [2]. 2) Transparent insulating phase of sodium [3] and new phases of calcium [4], CaLi2 [5], nitrogen [6]. 3) Unusual high-pressure behavior of methane CH4, silane SiH4 [7], germane GeH4 [8] and stannane SnH4 [9].

Many methodological developments happened recently. The method has been extended to molecular crystals, nanoparticles, and crystalline surfaces. It can now deal with systems with up to several hundred atoms in the unit cell. Its extension to variable-composition systems allows simultaneous finding of stable chemical compositions and the corresponding crystal structures in multinary A-B-C… systems. It is now also possible to search for compositions and structures possessing optimal values of a given physical property [10]. For a recent review of this method and its applications, see [11]. I will also discuss recent extension of this method to molecular crystals [12] and a new method – evolutionary metadynamics [14], which opens new prospects for computational materials discovery.

References

[1] Oganov A.R., Glass C.W., J. Chem. Phys. 124, 244704 (2006)
  [2] Oganov A.R., Chen J., Gatti C., et al., Nature 457, 863-867 (2009)
  [3] Ma Y., Eremets M.I., Oganov A.R., et al., Nature 458, 182-185. (2009)
  [4] Oganov A.R., Ma Y.M., Xu Y., et al. Proc. Natl. Acad. Sci. 107, 7646-7651 (2010).
  [5] Xie Y., Oganov A.R., Ma Y. Phys. Rev. Lett. 104, 177005 (2010).
  [6] Ma Y., Oganov A.R., Xie Y., et al., Phys. Rev. Lett. 102, 065501 (2009)
  [7] Martinez-Canales M., Oganov A.R., Lyakhov A.O., et al., Phys. Rev. Lett. 102, 087005 (2009)
  [8] Gao G., Oganov A.R., Bergara A., et al., Phys. Rev. Lett. 101, 107002 (2008).
  [9] Gao G., Oganov A.R., Li Z., et al. Proc. Natl. Acad. Sci. 107, 1317-1320 (2010).  
  [10] Oganov A.R., Lyakhov A.O. J. Superhard Mater. 32, 143-147 (2010).
  [11] Oganov A.R., Lyakhov A.O., Valle M. Acc. Chem. Res. 44, 227-237 (2011).
  [12] Zhu Q., Oganov A.R., Glass C.W., Stokes H.T. (2012). Acta Cryst. B68, 215-226(Feature Article).
  [13] Zhu Q., Oganov A.R., Lyakhov A.O. (2012). Cryst.Eng.Comm. 14, 3596-3601.

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