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Dislocation Core Structure at Finite Temperature Inferred by Molecular Dynamics Simulations for 1,3,5-Triamino-2,4,6- trinitrobenzene Single Crystal

Article dans une revue avec comité de lecture
Author
LAFOURCADE, Paul
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
DENOUAL, Christophe
7841 Département de Physique Théorique et Appliquée [DPTA]
119523 DAM Île-de-France [DAM/DIF]
MAILLET, Jean-Bernard
7841 Département de Physique Théorique et Appliquée [DPTA]
119523 DAM Île-de-France [DAM/DIF]

URI
http://hdl.handle.net/10985/12458
DOI
10.1021/acs.jpcc.6b11576
Date
2017
Journal
Journal of Physical Chemistry C

Abstract

The dislocation core structures and elastic properties of the insensitive energetic molecular crystal 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) are investigated as a function of pressure and temperature. A new method is proposed to compute the generalized stacking fault surfaces (noted γ-surfaces) and the complete second-order elastic tensor at finite temperature through molecular dynamics (MD) simulations. The energy landscapes in the two glide planes are shown to be similar between 0 and 300 K, thus leading to almost no modification on the dislocation evolution. A spreading of the dislocation cores over a hundred Burgers vectors is observed along the [100] and [010] directions for the edge and screw dislocations at 0 and 300 K, showing that dislocations should exhibit a very low friction for these glide systems at ambient pressure. For pressures varying between 0 and 10 GPa, the γ-surfaces' energy barriers that drive the width of partial dislocations follow the increase of shear elastic constants within the considered glide planes, thus limiting the changes of the dislocation core structure.

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