EXAFS measures the thermal variation of average interatomic distances, while Bragg diffraction and dilatometric techniques measure the variation of distances between average atomic positions. The difference not only gives information on vibrational motion perpendicular to the bond direction, but can be exploited to study the local behaviour in systems affected by negative thermal expansion. Recent results on copper, germanium and Ag2O are presented and critically compared
EXAFS and local thermal expansion
SANSON, ANDREA;
2005
Abstract
EXAFS measures the thermal variation of average interatomic distances, while Bragg diffraction and dilatometric techniques measure the variation of distances between average atomic positions. The difference not only gives information on vibrational motion perpendicular to the bond direction, but can be exploited to study the local behaviour in systems affected by negative thermal expansion. Recent results on copper, germanium and Ag2O are presented and critically compared
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