Thiel Research Goup
Chalcogens on Low-Index Silver Surfaces
Thin Films on NiAl(110)
LEED
Thin Films on Metallic Glass
Reseach Images
Fivefold icosahedral Al-Pd-Mn quasicrystal surfaceIcosahedral phases can be regarded as quasiperiodic in three dimensions
consisting of clusters of concentric shells containing a few tens of atoms.
The dark star in STM image below is universally interpreted as a hollow
site corresponding to a sliced cluster. The favored terminations in i-Al-Pd-Mn
and i-Al-Cu-Fe consist of pairs of planes, in which the outermost plane
is 90–100 at% Al, and the second plane is roughly half Al and half Pd. The
two planes are separated by only 0.04 nm, so they are aptly described as
a single rumpled layer with a composite.
Terrace, 15 nm x 15 nm Terrace-Step, 250 nm x 250 nm
Chalcogens on Low-Index Silver Surfaces
"Dot-Row" Structure: A strong case, based partly on energy calculations and the height of the dots in STM, can be made for assigning the dots as Ag3S3 clusters.
0.4 ML S/Ag(111), 200 K, 8 nm x 8 nm
0.1 ML S/Ag(111), 60 nm x 60 nm
Several hours after adsorption at 200 K ends and after heating to 300 K and re-cooling to 200 K. Review publication for more details.
See also earlier Oxygen on Silver STM images.
Thin Films on NiAl(110)
LEED images of the clean surface at 120 K
64 eV 111 eV
165 eV 222 eV
Thin Films on Metallic Glass
STM images following deposition of 12 ML Ag at different substrate temperatures on Bulk Metallic Glass surface.
300 K 260 K
240 K 190 K
Image size: 250 nm x 250 nm. Review publication for more details.