Liquid boron: X-ray measurements and ab initio molecular dynamics simulations

We report results of a comprehensive study of liquid boron with x-ray measurements of the atomic structure and dynamics coupled with ab initio molecular dynamics simulations. There is no evidence of survival into the liquid of the icosahedral arrangements that characterize the crystal structures of...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2009-04, Vol.79 (13), Article 134201
Main Authors: Price, David L., Alatas, Ahmet, Hennet, Louis, Jakse, Noël, Krishnan, Shankar, Pasturel, Alain, Pozdnyakova, Irina, Saboungi, Marie-Louise, Said, Ayman, Scheunemann, Richard, Schirmacher, Walter, Sinn, Harald
Format: Article
Language:English
Subjects:
ATOMS
BONDING
BORON
Chemical Sciences
CORRELATION FUNCTIONS
CRYSTAL STRUCTURE
DAMPING
Engineering Sciences
GEOMETRY
Material chemistry
Materials
MATERIALS SCIENCE
MELTING
SILICON
VELOCITY
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Summary:We report results of a comprehensive study of liquid boron with x-ray measurements of the atomic structure and dynamics coupled with ab initio molecular dynamics simulations. There is no evidence of survival into the liquid of the icosahedral arrangements that characterize the crystal structures of boron but many atoms appear to adopt a geometry corresponding to the pentagonal pyramids of the crystalline phases. Despite similarities in the melting behavior of boron and silicon, there is little evidence of a significant structural shift with temperature that might suggest an eventual liquid-liquid phase transition. Relatively poor agreement with the observed damping of the sound excitations is obtained with the simple form of mode-coupling theory that has proved successful with other monatomic liquids, indicating that higher-order correlation functions arising from directional bonding and short-lived local structures are playing a crucial role. The large ratio of the high frequency to the isothermal sound velocity indicates a much stronger viscoelastic stiffening than in other monatomic liquids.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.79.134201