Order in nanometer thick intergranular films at Au-sapphire interfaces

Mor Baram, Steve Garofalini, Wayne D. Kaplan

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In recent years extensive studies on interfaces have shown that ∼1 nm thick intergranular films (IGF) exist at interfaces in different material systems, and that IGF can significantly affect the materials' properties. However, there is great deal of uncertainty whether such films are amorphous or partially ordered. In this study specimens were prepared from Au particles that were equilibrated on sapphire substrates in the presence of anorthite glass, leading to the formation of 1.2 nm thick IGF at the Au-sapphire interfaces. Site-specific cross-section samples were characterized using quantitative high resolution transmission electron microscopy to study the atomistic structure of the films. Order was observed in the 1.2 nm thick films adjacent to the sapphire crystal in the form of "Ca cages", experimentally demonstrating that ordering is an intrinsic part of IGF, as predicted from molecular dynamics and diffuse interface theory.

Original languageEnglish
Pages (from-to)5710-5715
Number of pages6
JournalActa Materialia
Volume59
Issue number14
DOIs
Publication statusPublished - Aug 2011

Fingerprint

Aluminum Oxide
Thick films
Sapphire
Amorphous films
High resolution transmission electron microscopy
Molecular dynamics
Materials properties
Glass
Crystals
Substrates

Keywords

  • Alumina
  • Atomic ordering
  • High resolution electron microscopy
  • Interfaces
  • Intergranular films

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Order in nanometer thick intergranular films at Au-sapphire interfaces. / Baram, Mor; Garofalini, Steve; Kaplan, Wayne D.

In: Acta Materialia, Vol. 59, No. 14, 08.2011, p. 5710-5715.

Research output: Contribution to journalArticle

Baram, Mor ; Garofalini, Steve ; Kaplan, Wayne D. / Order in nanometer thick intergranular films at Au-sapphire interfaces. In: Acta Materialia. 2011 ; Vol. 59, No. 14. pp. 5710-5715.
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