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Title: Heteroepitaxy of FCC-on-FCC systems of large misfit

Abstract

Here, to understand the effects of lattice mismatch on heteroepitaxial growth, we have studied the equilibrium structure and orientation relationships (ORs) of FCC films grown epitaxially on FCC substrates, using molecular dynamics simulations in conjunction with embedded atom method potentials. Three film/substrate systems have been investigated, namely: Ag on Cu, Ag on Ni and Pb on Al. These systems cover a significant range of lattice mismatch, from 12.6% for Ag/Cu to 21.8% for Pb/Al. For each system, the ORs of films on six different substrate orientations, namely: (100), (511), (311), (211), (322) and (111), have been investigated. Films on these susbstrates cover a gradual transition from the oct-cube orientation relationship, which occurs only on (100) substrates, to the heterotwin orientation relationship, which often occurs on (111) substrates. It is found that the resulting ORs vary systematically with substrate orientation, but that the pattern of variation is almost identical for all three systems, and therefore largely independent of mismatch. However, the manner in which mismatch is accommodated does depend on the magnitude of mismatch. Simulations point to an important role for edge-to-edge matching and defects such as stacking faults. An analysis of these results in terms of transformation strains highlights themore » distinction between the ORs, which are largely independent of mismatch, and the local interfacial structure, which changes directly with mismatch.« less

Authors:
 [1];  [2];  [3]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Aix-Marseille Univ., Marseille (France)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Agence Nationale de la Recherche (ANR)
OSTI Identifier:
1906105
Alternate Identifier(s):
OSTI ID: 1836594
Grant/Contract Number:  
AC02-05CH11231; ANR-GIBBS-15-CE30-0016
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 225; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Orientation relationship; Molecular dynamics simulations; Stacking faults; Strain accommodation; Transformation strain

Citation Formats

Wynblatt, Paul, Chatain, Dominique, and Dahmen, Ulrich. Heteroepitaxy of FCC-on-FCC systems of large misfit. United States: N. p., 2022. Web. doi:10.1016/j.actamat.2021.117550.
Wynblatt, Paul, Chatain, Dominique, & Dahmen, Ulrich. Heteroepitaxy of FCC-on-FCC systems of large misfit. United States. https://doi.org/10.1016/j.actamat.2021.117550
Wynblatt, Paul, Chatain, Dominique, and Dahmen, Ulrich. Thu . "Heteroepitaxy of FCC-on-FCC systems of large misfit". United States. https://doi.org/10.1016/j.actamat.2021.117550. https://www.osti.gov/servlets/purl/1906105.
@article{osti_1906105,
title = {Heteroepitaxy of FCC-on-FCC systems of large misfit},
author = {Wynblatt, Paul and Chatain, Dominique and Dahmen, Ulrich},
abstractNote = {Here, to understand the effects of lattice mismatch on heteroepitaxial growth, we have studied the equilibrium structure and orientation relationships (ORs) of FCC films grown epitaxially on FCC substrates, using molecular dynamics simulations in conjunction with embedded atom method potentials. Three film/substrate systems have been investigated, namely: Ag on Cu, Ag on Ni and Pb on Al. These systems cover a significant range of lattice mismatch, from 12.6% for Ag/Cu to 21.8% for Pb/Al. For each system, the ORs of films on six different substrate orientations, namely: (100), (511), (311), (211), (322) and (111), have been investigated. Films on these susbstrates cover a gradual transition from the oct-cube orientation relationship, which occurs only on (100) substrates, to the heterotwin orientation relationship, which often occurs on (111) substrates. It is found that the resulting ORs vary systematically with substrate orientation, but that the pattern of variation is almost identical for all three systems, and therefore largely independent of mismatch. However, the manner in which mismatch is accommodated does depend on the magnitude of mismatch. Simulations point to an important role for edge-to-edge matching and defects such as stacking faults. An analysis of these results in terms of transformation strains highlights the distinction between the ORs, which are largely independent of mismatch, and the local interfacial structure, which changes directly with mismatch.},
doi = {10.1016/j.actamat.2021.117550},
journal = {Acta Materialia},
number = ,
volume = 225,
place = {United States},
year = {Thu Dec 08 00:00:00 EST 2022},
month = {Thu Dec 08 00:00:00 EST 2022}
}

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