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Polymorphic transitions in single crystals: A new molecular dynamics method

Parrinello, M., Rahman, A.·1981·Journal of Applied Physics

Abstract

A new Lagrangian formulation is introduced. It can be used to make molecular dynamics (MD) calculations on systems under the most general, externally applied, conditions of stress. In this formulation the MD cell shape and size can change according to dynamical equations given by this Lagrangian. This new MD technique is well suited to the study of structural transformations in solids under external stress and at finite temperature. As an example of the use of this technique we show how a single crystal of Ni behaves under uniform uniaxial compressive and tensile loads. This work confirms some of the results of static (i.e., zero temperature) calculations reported in the literature. We also show that some results regarding the stress-strain relation obtained by static calculations are invalid at finite temperature. We find that, under compressive loading, our model of Ni shows a bifurcation in its stress-strain relation; this bifurcation provides a link in configuration space between cubic and hexagonal close packing. It is suggested that such a transformation could perhaps be observed experimentally under extreme conditions of shock.

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Research works printed but not linked: 7

  1. 1976, Phys. Rev. B, 14, 1758, 10.1103/PhysRevB.14.1758 · DOI
  2. 1980, Phys. Rev. Lett., 45, 1196, 10.1103/PhysRevLett.45.1196 · DOI
  3. 1973, J. Appl. Phys., 44, 3825, 10.1063/1.1662857 · DOI
  4. 1973, J. Appl. Phys., 44, 3833, 10.1063/1.1662858 · DOI
  5. 1980, Phys. Rev. Lett., 44, 277, 10.1103/PhysRevLett.44.277 · DOI
  6. 1980, J. Chem. Phys., 72, 2384, 10.1063/1.439486 · DOI
  7. 1980, Phys. Rev. A, 22, 1690, 10.1103/PhysRevA.22.1690 · DOI

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Metadata

Authors
Parrinello, M., & Rahman, A.
Venue
Journal of Applied Physics
Published
1981-12-01
Volume
52
Issue
12
Pages
7182-7190
ISSN
  • 0021-8979 (ISSN-L)
  • 1089-7550
OpenAlex
W2081693079
Cited by
19,790
References
0
FWCI
14.49
Type
journal article
Language
en
Open access
closed

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