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 language | English |
|---|---|
| Pages (from-to) | 5710-5715 |
| Number of pages | 6 |
| Journal | Acta Materialia |
| Volume | 59 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - Aug 2011 |
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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 journal › Article
}
TY - JOUR
T1 - Order in nanometer thick intergranular films at Au-sapphire interfaces
AU - Baram, Mor
AU - Garofalini, Steve
AU - Kaplan, Wayne D.
PY - 2011/8
Y1 - 2011/8
N2 - 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.
AB - 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.
KW - Alumina
KW - Atomic ordering
KW - High resolution electron microscopy
KW - Interfaces
KW - Intergranular films
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UR - http://www.scopus.com/inward/citedby.url?scp=79960389354&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2011.05.046
DO - 10.1016/j.actamat.2011.05.046
M3 - Article
VL - 59
SP - 5710
EP - 5715
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 14
ER -