A method for complete characterization of the macroscopic geometry of grain boundaries
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Tartalom: http://real.mtak.hu/4634/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published

Type = Article
Cím:
A method for complete characterization of the macroscopic geometry of grain boundaries
Létrehozó:
Kiss, Ákos
Lábár, János
Kiadó:
Trans Tech Publications
Dátum:
2013
Téma:
T2 Technology (General) / műszaki tudományok általában
Tartalmi leírás:
In the current paper a new method is presented that determines the five macroscopic
parameters of a grain boundary (GB) from electron diffraction patterns and bright field (BF) images
in a transmission electron microscope. Usefulness of the method is demonstrated on a set of GBs
measured in laser crystallized Si thin films.
To characterize the geometry of a grain boundary, we have to determine the misorientation between
the neighboring grains, and the direction of the GB-plane. The misorientation is calculated from two
convergent beam electron diffraction (CBED) patterns taken on the neighboring grains, and the
plane-normal can be calculated from bright field (BF) images of the GB. The thickness of the
sample is also needed and it is measured from a CBED pattern taken in two-beam condition.
It has been previously observed in metallic thin films, that the GBs can minimize their energy in
two alternative ways in thin films: either forming a GB plane with low energy density or
minimizing the area of the plane. In the last case the GB plane is almost normal to the surface of the
specimen and has a general index. We found, that boundaries with exact ?3 misorientation
generally adopted low energy-density (111) boundary planes and formed coherent twins. The rest
of the boundaries adopted general index planes and minimized the surface area of the boundary.
The last group included boundaries with small deviation from ?3 misorientation, other special highangle
boundaries with ?-value>3 and boundaries with general misorientation.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Kiss, Ákos and Lábár, János (2013) A method for complete characterization of the macroscopic geometry of grain boundaries. Materials Science Forum, 729. pp. 97-102. ISSN 0255-5476
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