Title
The nature of the transition from supercooled liquid metal Si to the disordered solid phase, with possible implications for B The nature of the transition from supercooled liquid metal Si to the disordered solid phase, with possible implications for B
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Physics
Source (journal)
Physics and chemistry of liquids. - London
Volume/pages
47(2009) :1 , p. 111-112
ISSN
0031-9104
ISI
000263093300011
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The melting of crystalline silicon is well known to result in a metallic liquid. But when this is supercooled, it leads to a 'glass' transition to a non-metallic solid. This prompts us to first propose that in this 'metastable' phase transition the driving mechanism is the Coulomb repulsion between the electrons, the atomic structure remaining largely intact across the transition. This proposal then leads us to draw attention to the likely interest of the now very complex bonding in crystalline boron. Again, as with the simple sp3 bonding in Si, melting produces a metallic liquid in which supercooling is possible and for which earlier diffraction studies have proved possible using levitation techniques. It will be of interest to determine experimentally whether a glassy state exists for B, as single-component glasses are rare, only Si and S being known currently from diffraction experiments.
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