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Applications and limitations of electron correlation microscopy to study relaxation dynamics in supercooled liquids

TitleApplications and limitations of electron correlation microscopy to study relaxation dynamics in supercooled liquids
Publication TypeJournal Article
Year of Publication2017
AuthorsZhang, P, He, L, Besser, M, Liu, Z, Schroers, J, Kramer, MJ, Voyles, PM
JournalUltramicroscopy
Volume178
Pagination125-130
Date Published07
Type of ArticleArticle; Proceedings Paper
ISBN Number0304-3991
Accession NumberWOS:000403862900015
Keywordscoherent x-rays, diffraction, electron correlation microscopy, In-situ heating, Metallic glass, metallic glasses, microscopy, photon-correlation spectroscopy, relaxation time, structural, supercooled liquid, transition
Abstract

Electron correlation microscopy (ECM) is a way to measure structural relaxation times, tau, of liquids with nanometer-scale spatial resolution using coherent electron scattering equivalent of photon correlation spectroscopy. We have applied ECM with a 3.5 nm diameter probe to Pt57.5Cu14.7Ni53P22.5 amorphous nanorods and Pd40Ni40P20 bulk metallic glass (BMG) heated inside the STEM into the supercooled liquid region. These data demonstrate that the ECM technique is limited by the characteristics of the time series, which must be at least 40 tau to obtain a well-converged correlation function g(2)(t), and the time per frame, which must be less than 0.1 tau to obtain sufficient sampling. A high-speed direct electron camera enables fast acquisition and affords reliable g2(t) data even with low signal per frame. (C) 2016 Elsevier B.V. All rights reserved.

DOI10.1016/j.ultramic.2016.09.001
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