Journal of Materials Science

, Volume 48, Issue 7, pp 3013–3026 | Cite as

Copper crystals on the (11\(\bf{\bar{2}}\)0) sapphire plane: orientation relationships, triple line ridges and interface shape equilibrium

  • Stefano Curiotto
  • Harry Chien
  • Hila Meltzman
  • Stephane Labat
  • Paul Wynblatt
  • Gregory S. Rohrer
  • Wayne D. Kaplan
  • Dominique Chatain
Article

Abstract

The orientation relationships (ORs) of copper crystals on a \( (11\bar{2}0) \) sapphire substrate equilibrated at 1253 K are presented. They barely depend on the procedures used in sample preparation, i.e. dewetting of a copper film in the liquid state or in the solid state. The most frequent OR found is Cu(111) || Al2O3\( (11\bar{2}0) \) and Cu\( [1\bar{1}0] \) within few degrees from Al2O3[0001]. A secondary, lower frequency OR is also observed: Cu(001) || Al2O3\( (11\bar{2}0) \) with Cu\( [1\bar{1}0] \) within a few degrees from either Al2O3\( [1\bar{1}00] \) or Al2O3[0001]. These ORs do not follow the Fecht and Gleiter model which proposes that dense directions of the metal should align with dense directions of the oxide. On annealing, even at a temperature about half of the melting point of sapphire, fast diffusion of sapphire at the copper/sapphire interface is observed: the copper particles tend to achieve their interfacial equilibrium shapes by sinking into the substrate, and sapphire ridges form at the triple line. Finally, it is shown that the Cu(111) || Al2O3\( (11\bar{2}0) \) interface remains flat at the atomic scale, and is therefore part of the copper/sapphire equilibrium interfacial shape.

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Stefano Curiotto
    • 1
  • Harry Chien
    • 2
  • Hila Meltzman
    • 3
  • Stephane Labat
    • 4
  • Paul Wynblatt
    • 2
  • Gregory S. Rohrer
    • 2
  • Wayne D. Kaplan
    • 3
  • Dominique Chatain
    • 1
  1. 1.Aix Marseille Université, CNRS, CINaM UMR 7325MarseilleFrance
  2. 2.Department of Materials Science and EngineeringCarnegie Mellon UniversityPittsburghUSA
  3. 3.Department of Materials Science and EngineeringTechnion-Israel Institute of TechnologyHaifaIsrael
  4. 4.Aix Marseille Université, CNRS, IM2NP UMR 6242MarseilleFrance

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