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Title: Melting as a dislocation-mediated phase transition

Abstract

We present a theory of the melting of elements as a dislocation-mediated phase transition. We model dislocations near the melt as noninteracting closed loops on a lattice. In this framework we derive simple expressions for the melting temperature and latent heat of fusion that depend on the dislocation density at melt. We use experimental data for more than half the elements in the periodic table to determine the dislocation density from both relations. Melting temperatures yield a dislocation density of (0.61{+-}0.20)b{sup -2}, in good agreement with the density obtained from latent heats, (0.66{+-}0.11)b{sup -2}, where b is the length of the smallest perfect-dislocation Burgers vector. Melting corresponds to the situation where, on average, half of the atoms are within a dislocation core. (c) 2000 The American Physical Society.

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216775
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 22; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; MELTING; PHASE TRANSFORMATIONS; DISLOCATIONS; DENSITY; BURGERS VECTOR; FUSION HEAT; THEORETICAL DATA

Citation Formats

Burakovsky, Leonid, Preston, Dean L., and Silbar, Richard R. Melting as a dislocation-mediated phase transition. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.61.15011.
Burakovsky, Leonid, Preston, Dean L., & Silbar, Richard R. Melting as a dislocation-mediated phase transition. United States. doi:10.1103/PhysRevB.61.15011.
Burakovsky, Leonid, Preston, Dean L., and Silbar, Richard R. Thu . "Melting as a dislocation-mediated phase transition". United States. doi:10.1103/PhysRevB.61.15011.
@article{osti_20216775,
title = {Melting as a dislocation-mediated phase transition},
author = {Burakovsky, Leonid and Preston, Dean L. and Silbar, Richard R.},
abstractNote = {We present a theory of the melting of elements as a dislocation-mediated phase transition. We model dislocations near the melt as noninteracting closed loops on a lattice. In this framework we derive simple expressions for the melting temperature and latent heat of fusion that depend on the dislocation density at melt. We use experimental data for more than half the elements in the periodic table to determine the dislocation density from both relations. Melting temperatures yield a dislocation density of (0.61{+-}0.20)b{sup -2}, in good agreement with the density obtained from latent heats, (0.66{+-}0.11)b{sup -2}, where b is the length of the smallest perfect-dislocation Burgers vector. Melting corresponds to the situation where, on average, half of the atoms are within a dislocation core. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.61.15011},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 22,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}