Local lattice dynamics and negative thermal expansion in crystals

Local lattice dynamics and negative thermal expansion in crystals

The investigations on the origin of negative thermal expansion (NTE) in crystals can greatly benefit from the joint use of Bragg diffraction and extended x-ray absorption fine structure (EXAFS). In this paper, the relative merits of the two techniques are critically discussed, and recent results on...

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Veröffentlicht in:Journal of physics. Conference series 2007-12, Vol.92 (1), p.012153
Hauptverfasser: Fornasini, P, Sanson, A, Vaccari, M, Artioli, G, Dapiaggi, M
Format: Artikel
Sprache:eng
Schlagworte:
Anisotropy
Copper chloride
Crystal lattices
Fine structure
Physics
Thermal expansion
X ray absorption
Zincblende
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Zusammenfassung:The investigations on the origin of negative thermal expansion (NTE) in crystals can greatly benefit from the joint use of Bragg diffraction and extended x-ray absorption fine structure (EXAFS). In this paper, the relative merits of the two techniques are critically discussed, and recent results on CuCl (zincblende structure) and Cu2O and Ag2O (cuprite structure) are compared. The tension effect giving rise to NTE can be correlated to the anisotropy of the mean square relative displacements.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/92/1/012153