Cerium oxides and cerium-platinum surface alloys on Pt(111) single-crystal surfaces studied by scanning tunneling microscopy

2002 ◽  
Vol 65 (23) ◽  
Author(s):  
Ulrich Berner ◽  
Klaus-Dieter Schierbaum
Keyword(s):  
Single Crystal ◽  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Surface Alloys ◽  
Tunneling Microscopy ◽  
Crystal Surfaces ◽  
Platinum Surface ◽  
Single Crystal Surfaces ◽  
Cerium Oxides

Scanning tunneling microscopy of stepped single crystal surfaces of gold

1992 ◽  
Vol 273 (1-2) ◽  
pp. L425-L429 ◽  
Author(s):  
R.R. Adzic ◽  
M.W. Hsiao ◽  
E.B. Yeager ◽  
G. Pruett
Keyword(s):  
Single Crystal ◽  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces

SEGREGATION PHENOMENA ON PtxNi1−x LOW INDEX SINGLE CRYSTAL SURFACES STUDIED BY STM

1996 ◽  
Vol 03 (05n06) ◽  
pp. 1831-1845 ◽  
Author(s):  
P. VARGA ◽  
M. SCHMID ◽  
W. HOFER
Keyword(s):  
Single Crystal ◽  
Surface Segregation ◽  
Elevated Temperatures ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Chemical Ordering ◽  
Preferential Sputtering ◽  
Altered Layer

Surface segregation changes the composition of alloy surfaces. It influences both the geometrical and the chemical structure of the surface. In this paper segregation phenomena are shown for low index single crystal surfaces of different PtNi alloys which can be seen only by scanning tunneling microscopy (STM). STM experiments performed with atomic resolution revealed the existence of subsurface dislocation networks. A closer study of the conditions of their existence allowed us to understand the effects of preferential sputtering and annealing on the segregation behavior (i.e. building up a rather stable altered layer and its disappearance only at elevated temperatures). In addition, local chemical ordering in small domains and shifted row reconstructions with a large and varying periodicity (i.e. phenomena that are hardly seen by other methods like e.g. LEED) have been observed.

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