Abstract:
:Quantifying chemical compositions around nanovoids is a fundamental task for research and development of various materials. Atom probe tomography (APT) and scanning transmission electron microscopy (STEM) are currently the most suitable tools because of their ability to probe materials at the nanoscale. Both techniques have limitations, particularly APT, because of insufficient understanding of void imaging. Here, we employ a correlative APT and STEM approach to investigate the APT imaging process and reveal that voids can lead to either an increase or a decrease in local atomic densities in the APT reconstruction. Simulated APT experiments demonstrate the local density variations near voids are controlled by the unique ring structures as voids open and the different evaporation fields of the surrounding atoms. We provide a general approach for quantifying chemical segregations near voids within an APT dataset, in which the composition can be directly determined with a higher accuracy than STEM-based techniques.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Wang X,Hatzoglou C,Sneed B,Fan Z,Guo W,Jin K,Chen D,Bei H,Wang Y,Weber WJ,Zhang Y,Gault B,More KL,Vurpillot F,Poplawsky JDdoi
10.1038/s41467-020-14832-wsubject
Has Abstractpub_date
2020-02-24 00:00:00pages
1022issue
1issn
2041-1723pii
10.1038/s41467-020-14832-wjournal_volume
11pub_type
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