Investigating Ca Segregated to a Grain Boundaries in MgO Using Multiple Scattering Analysis of Electron Energy Loss Spectra

Although grain boundaries typically account for only a small fraction of a material, they can have far reaching effects on the overall bulk scale properties. These effects are usually simply linked to the boundary having a different atomic arrangement to the bulk. A necessary first step in understan...

Full description

Saved in:
Bibliographic Details
Published in:Microscopy and microanalysis 1998-07, Vol.4 (S2), p.776-777
Main Authors: Buban, J. P., Zaborac, J., Moltaji, H., Duscher, G., Browning, N. D.
Format: Article
Language:English
Subjects:
Atomic structure
Boundaries
Electron energy loss spectroscopy
Energy dissipation
Energy loss
Grain boundaries
Image contrast
Multiple scatter
Oxygen atoms
Spatially-Resolved Characterization of Interfaces in Materials
Spectroscopy
Spectrum analysis
Structural models
Valence
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Although grain boundaries typically account for only a small fraction of a material, they can have far reaching effects on the overall bulk scale properties. These effects are usually simply linked to the boundary having a different atomic arrangement to the bulk. A necessary first step in understanding the structure-property relationships is therefore a detailed determination of the boundary structure. One means of obtaining detailed information on the structure of grain boundaries is through correlated Z-contrast imaging and electron energy loss spectroscopy (EELS). The Z-contrast image generates a map of the grain boundary which can be used to position the probe in defined locations for spectroscopy. In the case of oxides, a structural model of the metal atom positions can be determined directly from the image. Furthermore, using a simple bond-valence sum minimization routine, the oxygen atoms can be placed so that the structure contains atoms that have valences consistent with their expected formal valence state.
ISSN:1431-9276
1435-8115
DOI:10.1017/S1431927600024004