Composition-dependent ordering transformations in Pt-Fe nanoalloys

SignificanceDynamically understanding the microscopic processes governing ordering transformations has rarely been attained. The situation becomes even more challenging for nanoscale alloys, where the significantly increased surface-area-to-volume ratio not only opens up a variety of additional free...

Full description

Saved in:
Bibliographic Details
Published inProceedings of the National Academy of Sciences - PNAS Vol. 119; no. 14; p. e2117899119
Main Authors Chen, Xiaobo, Zhang, Siming, Li, Can, Liu, Zhijuan, Sun, Xianhu, Cheng, Shaobo, Zakharov, Dmitri N, Hwang, Sooyeon, Zhu, Yimei, Fang, Jiye, Wang, Guofeng, Zhou, Guangwen
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 05.04.2022
Proceedings of the National Academy of Sciences
Subjects
Alloys
Composition
Counterdiffusion
Diffusion
Electron microscopy
ENERGY STORAGE
In-situ electron microscopy
Intermetallic compounds
MATERIALS SCIENCE
Nanoalloys
Nanoparticles
Nucleation
Ordering transformation
Oxidation
Physical Sciences
Platinum
Pt-Fe nanoparticles
Size effects
Skin
Stimuli
Transformations
Vacancies
Vacuum annealing
in situ electron microscopy
Pt–Fe nanoparticles
chemical ordering
alloy composition
Online AccessGet full text

Cover

More Information
Summary:SignificanceDynamically understanding the microscopic processes governing ordering transformations has rarely been attained. The situation becomes even more challenging for nanoscale alloys, where the significantly increased surface-area-to-volume ratio not only opens up a variety of additional freedoms to initiate an ordering transformation but also allows for kinetic interplay between the surface and bulk due to their close proximity. We provide direct evidence of the microscopic processes controlling the ordering transformation through the surface-bulk interplay in Pt-Fe nanoalloys and new features rendered by variations in alloy composition and chemical stimuli. These results provide a mechanistic detail of ordering transformation phenomena which are widely relevant to nanoalloys as chemical ordering occurs in most multicomponent materials under suitable environmental bias.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
USDOE
BNL-223021-2022-JAAM
National Science Foundation (NSF)
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
SC0012704; SC0001135; SC0019445; ACI-1053575; DMR-1905422; DMR-1905572; DMR-1808383
Author contributions: G.Z. designed research; X.C., S.Z., and C.L. performed research; C.L., Z.L., X.S., S.C., D.N.Z., S.H., Y.Z., J.F., and G.W. contributed new reagents/analytic tools; X.C. and S.Z. analyzed data; and X.C. and G.Z. wrote the paper.
Edited by Alexis Bell, University of California, Berkeley, CA; received September 29, 2021; accepted February 7, 2022
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2117899119