Ca segregation at Au–YSZ interfaces

Ting Mao, Hadar Nahor, Wayne D. Kaplan

Research output: Contribution to journalArticlepeer-review

Abstract

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/m 2 ) 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/nm 2 (detection limit of 0.12 atoms/nm 2 ). 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.

Original languageEnglish
Pages (from-to)7719-7727
Number of pages9
JournalJournal of Materials Science
Volume54
Issue number10
DOIs
StatePublished - 30 May 2019

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

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