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Chinese Journal of High Pressure Physics  > 2005  >  19(4): 331-336 .
CHEN Chang-Bo, CUI Tian, LIU Zhi-Ming, ZOU Guang-Tian, WEI Meng-Fu, CHEN Chang-An. Pressure Effects on the Elastic Properties of the hcp Lithuim[J]. Chinese Journal of High Pressure Physics, 2005, 19(4): 331-336 . doi: 10.11858/gywlxb.2005.04.008
Citation: CHEN Chang-Bo, CUI Tian, LIU Zhi-Ming, ZOU Guang-Tian, WEI Meng-Fu, CHEN Chang-An. Pressure Effects on the Elastic Properties of the hcp Lithuim[J]. Chinese Journal of High Pressure Physics, 2005, 19(4): 331-336 . doi: 10.11858/gywlxb.2005.04.008
shu

Pressure Effects on the Elastic Properties of the hcp Lithuim

doi: 10.11858/gywlxb.2005.04.008
  • 1.

    National Laboratory of Superhard Materials, Jilin University, Changchun 130023, China;

  • 2.

    China Academy of Engineering Physics, Mianyang 621900, China

More Information
  • Corresponding author: CUI Tian
  • Received Date: 11 Oct 2004
  • Rev Recd Date: 01 Sep 2005
  • Publish Date: 05 Dec 2005
    Abstract
  • The elastic constants of bulk lithium with hexagonal close-packed (hcp) structure under high pressures have been calculated, by using Density Functional Theory and the relationship between stress and strain. From our results, C12 and C13 increase linearly with pressures, but pressure effects on C44 and C66 are not obvious. At each pressure, C33 is bigger than C11, indicating rigidity of lithium in z direction is harder than that in x, y direction. It has been found that C11 and C33 have step-like changes in the phase transition zone. The results of the compressional wave anisotropy (p) show that p is equal to 1 at zero pressure and still near 1 under high pressure, meaning hcp lithium have the compressional elastic isotropy. The shear wave anisotropy (s1, s2) are away from 1 and this tendency increases with the increasing of pressure, showing the shear elastic anisotropy. Pressure effects on the Cauchy relations and the normalized elastic constants of hcp lithium are also discussed in this paper.

     

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