Published October 15, 1978 | Version v1
Journal article Metadata-only

Surface segregation in LaNi5 induced by oxygen

Creators

  • 1. Laboratory of Solid State Physics, ETH Hoenggerberg, 8093 Zuerich, Switzerland

Description

LEED and AES studies of LaNi5 single crystals cleaved in UHV and exposed to oxygen and hydrogen show that surface segregation of La is induced at room temperature by oxygen, but not by hydrogen. This segregation is driven by the chemical exchange reaction (La-Ni)+O→ (La-O)+Ni. A surface-layer model is derived supporting the important implications of the segregation for the excellent kinetics in hydrogenation and the resistance to contaminants

Additional details

Publishing Information

Journal Title
Appl. Phys. Lett.
Journal Volume
33
Journal Issue
8
Series
Appl. Phys. Lett.
Journal Page Range
689-691

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
10425954
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
AUGER ELECTRON SPECTROSCOPY; ELECTRON DIFFRACTION; HYDROGEN; LANTHANUM ALLOYS; MICROSTRUCTURE; MONOCRYSTALS; NICKEL BASE ALLOYS; OXYGEN; PHASE STUDIES; SEGREGATION; SURFACES
Descriptors DEC
ALLOYS; COHERENT SCATTERING; CRYSTAL STRUCTURE; CRYSTALS; DIFFRACTION; ELECTRON SPECTROSCOPY; ELEMENTS; NICKEL ALLOYS; NONMETALS; RARE EARTH ALLOYS; SCATTERING; SPECTROSCOPY; TRANSITION ELEMENT ALLOYS