Atomically ordered solute segregation behaviour in an oxide grain boundary

Bin Feng, Tatsuya Yokoi, Akihito Kumamoto, Masato Yoshiya, Yuichi Ikuhara and Naoya Shibata ()
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Bin Feng: Institute of Engineering Innovation, The University of Tokyo
Tatsuya Yokoi: Osaka University
Akihito Kumamoto: Institute of Engineering Innovation, The University of Tokyo
Masato Yoshiya: Osaka University
Yuichi Ikuhara: Institute of Engineering Innovation, The University of Tokyo
Naoya Shibata: Institute of Engineering Innovation, The University of Tokyo

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Grain boundary segregation is a critical issue in materials science because it determines the properties of individual grain boundaries and thus governs the macroscopic properties of materials. Recent progress in electron microscopy has greatly improved our understanding of grain boundary segregation phenomena down to atomistic dimensions, but solute segregation is still extremely challenging to experimentally identify at the atomic scale. Here, we report direct observations of atomic-scale yttrium solute segregation behaviours in an yttria-stabilized-zirconia grain boundary using atomic-resolution energy-dispersive X-ray spectroscopy analysis. We found that yttrium solute atoms preferentially segregate to specific atomic sites at the core of the grain boundary, forming a unique chemically-ordered structure across the grain boundary.

Date: 2016
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DOI: 10.1038/ncomms11079

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