Ca segregation at Au–YSZ interfaces


Au thin films deposited on (111) YSZ single-crystal substrates were dewetted and equilibrated in a low oxygen partial pressure (10−20 atm) at 950 °C. Electron backscattered diffraction of 150 equilibrated Au particles shows that there is no preferred low-index orientation relationship (in-plane orientation relationship) but rather a strong preferred orientation of {111} Au || {111} YSZ. This result is associated with identical interface energies (1.75 ± 0.02 J/m2) measured using Winterbottom analysis from three equilibrated Au particles with different orientation relationships with the YSZ substrate. Energy dispersive spectroscopy in a scanning transmission electron microscope of the interfaces showed a Ca excess of Γ = 1.65 ± 0.20 atoms/nm2 (detection limit of 0.12 atoms/nm2). It is believed that Ca segregation reduces the interface energy of the system, resulting in a more isotropic orientation distribution instead of a low-index orientation relationship normally seen between fcc metals and YSZ.

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This research was partially supported by the Israel Science Foundation (grant 381/14). The authors acknowledge Y. Kauffmann, A. Berner, A. Kosinova, and L. Rudnik for assistance with the characterization process.

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Correspondence to Wayne D. Kaplan.

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Mao, T., Nahor, H. & Kaplan, W.D. Ca segregation at Au–YSZ interfaces. J Mater Sci 54, 7719–7727 (2019).

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