| Issue |
Eur. Phys. J. AP
Volume 2, Number 2, May 1998
|
|
|---|---|---|
| Page(s) | 157 - 161 | |
| DOI | https://doi.org/10.1051/epjap:1998179 | |
| Published online | 15 May 1998 | |
https://doi.org/10.1051/epjap:1998179
Observation of the elastic field related to a structural domain boundary along a {111}NiSi2//{115}Si heterotwin interface*
1
Institut National Polytechnique de
Grenoble (LTPCM (UMR 5614)),
ENSEEG, BP. 75, 38402, Saint-Martin-d'Hères, France
2
HRTEM Lab., Materials Science Centre,
National Tsing-Hua University, Hsinchu, Taiwan,
Republic of China
Corresponding author: rbonnet@ltpcm.inpg.fr
Received:
28
October
1997
Revised:
26
December
1997
Accepted:
20
February
1998
Published online: 15 May 1998
A
heterotwin interface has been observed by high resolution
electron microscopy (HREM) along the common
direction ![$\rm [\bar{1}\bar{1}0]NiSi_2 //[\bar{1}\bar{1}0]Si$](/articles/epjap/abs/1998/05/ap7029/ap7029_tex_eq3.png)
to identify the long
period atomic structural units (ASU's). Coexistence of two different structural doMayns has been
found with ASU's corresponding to two different cycles of five-, six-, and
seven-atom rings. A
dislocation/ledge (DL) has been particularly studied because its separates these two unusual cycles of
ASU's. The elastic displacement field u
of the atom columns around the DL has been calculated using
both crystallographic and anisotropic elasticity
properties of the crystals, assuming a two-dimensional
u field. From a comparison between the positions of the atom columns as
derived from elasticity
calculations and as deduced from the HREM image, it is concluded that the DL is a mixed dislocation
with the Burgers vector
![$\rm (-1/4)[111]NiSi_2 + (1/2)[1\bar{1}0]Si= (1/12)[515]Si$](/articles/epjap/abs/1998/05/ap7029/ap7029_tex_eq4.png)
,
a result also in
agreement with the imperceptible ledge height associated with the DL core. Such a Burgers vector
underlines the role of the Si matrix dislocations for producing such structural doMayns.
PACS: 68.35.Bs – Surface structure and topography
© EDP Sciences, 1998
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