Title: Stabilisation and phase transformation of hexagonal rare-earth silicides on Si(111)
Authors: Vantomme, AndrĂ© ×
Wu, MF
Hogg, Susan
Wahl, Ulrich
Deweerd, W
Pattyn, Hugo
Langouche, Guido
Jin, S
Bender, H #
Issue Date: Jan-1999
Publisher: Elsevier science bv
Series Title: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms vol:147 issue:1-4 pages:261-266
Abstract: Epitaxial, hexagonal rare-earth silicides, such as ErSi1.7, can be formed using channeled ion beam synthesis. In the case of Gd-silicide, an orthorhombic GdSi2 phase exists at high temperature; the transition temperature is related to the thickness and crystalline quality of the silicide. In the case of the lightest rare-earth metals, such as Nd, silicides only exist in a tetragonal or orthorhombic phase, which cannot grow epitaxially on Si(111). However, introduction of a fraction of yttrium (YSi1.7 also possesses the aforementioned hexagonal lattice) drives the Nd-Si system into a hexagonal lattice structure. A combined backscattering and channeling spectrometry (RBS/C), X-ray diffraction (XRD) and transmission electron microscopy (TEM) study shows that an epitaxial, continuous ternary silicide is formed land not a mixture of binaries) with a hexagonal structure, which is stable up to 950 degrees C. Further annealing, however, results in a gradual transformation into polycrystalline phases. The experimental results are compared to total energy calculations of these (meta-)stable rare-earth silicides, using the density functional theory (DFT). (C) 1999 Elsevier Science B.V. All rights reserved.
ISSN: 0168-583X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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