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Two-mode Ginzburg-Landau theory of crystalline anisotropy for fcc-liquid interfaces

Journal Article · · Physical Review. B
 [1];  [2];  [3]
  1. National Tsing Hua University, Hsinchu (Taiwan); Northeastern University
  2. National Tsing Hua University, Hsinchu (Taiwan)
  3. Northeastern University, Boston, MA (United States)

Here we develop a Ginzburg-Landau (GL) theory for fcc crystal-melt systems at equilibrium by employing two sets of order parameters that correspond to amplitudes of density waves of principal reciprocal lattice vectors and amplitudes of density waves of a second set of reciprocal lattice vectors. The choice of the second set of reciprocal lattice vectors is constrained by the condition that this set must form closed triangles with the principal reciprocal lattice vectors in reciprocal space to make the fcc-liquid transition first order. The capillary anisotropy of fcc-liquid interfaces is investigated by GL theory with amplitudes of $$\langle$$111$$\rangle$$ and $$\langle$$200$$\rangle$$ density waves. Furthermore, we explore the dependence of the anisotropy of the excess free energy of the solid-liquid interface on density waves of higher-order reciprocal lattice vectors such as $$\langle$$311$$\rangle$$ by extending the two-mode GL theory with an additional mode. The anisotropy calculated using GL theory with input parameters from molecular dynamics (MD) simulations for fcc Ni is compared to that measured in MD simulations.

Research Organization:
Northeastern University, Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Council of Taiwan
Grant/Contract Number:
FG02-07ER46400
OSTI ID:
1906129
Alternate ID(s):
OSTI ID: 1239431
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 93; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Kinetics of Crystallization and Orientational Ordering in Dipolar Particle Systems journal November 2020

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