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Atomic structure and lattice defects in nanolaminated ternary transition metal borides
Journal article   Open access

Atomic structure and lattice defects in nanolaminated ternary transition metal borides

Jun Lu, Sankalp Kota, Michel W. Barsoum and Lars Hultman
Materials research letters, v 5(4)
04 Jul 2017
DOI: https://doi.org/10.1080/21663831.2016.1245682
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https://doi.org/10.1080/21663831.2016.1245682View
Published, Version of Record (VoR)CC BY V4.0,  Open

Abstract

crystal structure defects EDX Nanolaminated ternary transition metal borides STEM Z-contrast images
We use analytical aberration-corrected high-resolution scanning transmission electron microscopy to image the atomic structure of the layered ternary transition metal (M) borides, Cr 2 AlB 2 , Fe 2 AlB 2 , and MoAlB. In these ternaries, MB layers and Al single or double atomic layers are interleaved. The atomic positions of the M elements and Al are clearly resolved by Z-contrast images. The following structural defects are also found and described herein: a 90° twist boundary along [010] in Cr 2 AlB 2 , a tilt boundary in Fe 2 AlB 2 , and Mo 2 AlB 2 -like stacking faults in MoAlB, where some of the MB-based structures are intercalated by one (instead of two) Al layer(s). IMPACT STATEMENT Atomic structures of ternary transition metal borides Cr 2 AlB 2 , Fe 2 AlB 2 , and MoAlB are observed for the first time by HRSTEM. Some structural defects are also found in those borides.

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Domestic collaboration
International collaboration
Web of Science research areas
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
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