Debye temperature at the fivefold- and threefold-symmetry surface of the Al-Pd-Mn quasicrystal
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Date
2004
Publication Type
Conference Paper
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yes
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Abstract
Specular-beam intensity profiles are measured in low-energy electron diffraction as a function of temperature for the fivefold- and threefold-symmetry surfaces of the icosahedral quasicrystal Al-Pd-Mn. The resulting shifts of the Bragg-peaks to lower energies are accounted for mainly by a lattice expansion perpendicular to the surface and allow us to determine the thermal expansion coefficient of atomic layers to be (24.5 ± 2.0) × 10-6 K -1 for both surfaces. As a result of several measurements, a surface Debye temperature of 298 ± 7 K is found for the pentagonal and 301 ± 10 K for the threefold-symmetry surface. This similarity implies comparable bonding forces for the atoms at these surfaces. Additionally, the derived thermal expansion coefficient supports a layer-based structural model for both surfaces investigated here.
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Publication status
published
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Book title
Quasicrystals 2003 - Preparation, Properties and Applications
Journal / series
Volume
805
Pages / Article No.
299 - 304
Publisher
Materials Research Society
Event
Symposium on Quasicrystals 2003 - Preparation, Properties and Applications held at the 2003 MRS Fall Meeting