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Insulator–conductor transition in liquid aluminium trichloride

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
372
Issue
31
Identifiers
DOI: 10.1016/j.physleta.2008.06.006
Keywords
  • Condensed Matter

Abstract

Abstract We report molecular-dynamics simulations of ionic structure and diffusion in a pseudoclassical model of AlCl 3 over a wide region of the pressure–temperature ( p , T ) plane. The model melts from a layer crystal into a molecular liquid at low ( p , T ) and into a dissociated ionic liquid at high ( p , T ) , in accord with x-ray diffraction studies of the AlCl 3 material. We show that pressure drives a broad liquid–liquid transition from a molecular insulator to an ionic conductor and trace the transition line in the ( p , T ) plane. This line has a negative d p / d T slope and appears to branch out from an anomaly in the melting curve.

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