Chain-like structure elements in Ni40Ta60 metallic glasses observed by scanning tunneling microscopy.

Abstract:

:The structure of metallic glasses is a long-standing question because the lack of long-range order makes diffraction based techniques difficult to be applied. Here, we used scanning tunneling microscopy with large tunneling resistance of 6 GΩ at low temperature in order to minimize forces between probe and sample and reduce thermal fluctuations of metastable structures. Under these extremely gentle conditions, atomic structures of Ni40Ta60 metallic glasses are revealed with unprecedented lateral resolution. In agreement with previous models and experiments, icosahedral-like clusters are observed. The clusters show a high degree of mobility, which explains the need of low temperatures for stable imaging. In addition to icosahedrons, chain-like structures are resolved and comparative density functional theory (DFT) calculations confirm that these structures are meta-stable. The co-existence of icosahedral and chain-like structures might be an key ingredient for the understanding of the mechanical properties of metallic glasses.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pawlak R,Marot L,Sadeghi A,Kawai S,Glatzel T,Reimann P,Goedecker S,Güntherodt HJ,Meyer E

doi

10.1038/srep13143

subject

Has Abstract

pub_date

2015-08-13 00:00:00

pages

13143

issn

2045-2322

pii

srep13143

journal_volume

5

pub_type

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