Surface and grain-boundary energies as well as surface mass transport in polycrystalline yttrium oxide

G. Triantafyllou, G. N. Angelopoulos, P. Nikolopoulos*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The sessile drop technique has been used to measure the temperature dependence of the contact angle, theta, of the liquid metals Ag and Cu in contact with polycrystalline yttrium oxide (yttria, Y(2)O(3)) at the temperature range 1,333-1,773 K in Ar/4%H(2) atmosphere. Combination of the experimental results with literature data taken for nonwetted and nonreactive oxide/liquid metal systems permit the calculation of the surface energy of Y(2)O(3) as gamma(sv) (J/m(2)) = 2.278-0.391 x 10(-3) T. For the same atmospheric conditions, thermal etching experiments on the grain boundaries intersecting the surface of the polycrystalline ceramic allow to determine the groove angles, psi, with respect to temperature and time as well as the grain-boundary energy of Y(2)O(3) as gamma(ss) (J/m(2)) = 1.785-0.306 x 10(-3) T. Grain-boundary grooving studies on polished surfaces of Y(2)O(3) annealed in Ar/4%H(2) atmosphere between 1,553 K and 1,873 K have shown that surface diffusion is the dominant mechanism for the mass transport. The surface diffusion coefficient can be expressed according to the equation D (s) (m(2)/s) = 1.22 x 10(-3) exp(-343554/RT).

Original languageEnglish
Pages (from-to)2015-2022
Number of pages8
JournalJournal of Materials Science
Volume45
Issue number8
DOIs
Publication statusPublished - Apr 2010

Keywords

  • INTERFACIAL ENERGIES
  • LIQUID-METALS
  • URANIUM-DIOXIDE
  • SYSTEMS
  • WETTABILITY
  • ZIRCONIA
  • OXYGEN
  • DIFFUSION
  • ALUMINA
  • AL2O3

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