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

Pawlak, Remy and Marot, Laurent and Sadeghi, Ali and Kawai, Shigeki and Glatzel, Thilo and Reimann, Peter and Goedecker, Stefan and Guentherodt, Hans-Joachim and Meyer, Ernst. (2015) Chain-like structure elements in Ni40Ta60 metallic glasses observed by scanning tunneling microscopy. Scientific Reports, 5. p. 13143.

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Official URL: http://edoc.unibas.ch/40345/

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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 G Omega 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 metastable. The co-existence of icosahedral and chain-like structures might be an key ingredient for the understanding of the mechanical properties of metallic glasses.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst and Glatzel, Thilo and Pawlak, Rémy and Marot, Laurent and Sadeghi, Ali and Kawai, Shigeki and Reimann, Peter and Goedecker, Stefan and Güntherodt, Hans-Joachim
Item Type:Article, refereed
Publisher:Nature Publishing Group
e-ISSN:2045-2322
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Oct 2017 09:43
Deposited On:02 May 2016 13:55

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