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.
Local lattice dynamics and negative thermal expansion in crystals / P. FORNASINI, A. SANSON, M. VACCARI, G. ARTIOLI, M. DAPIAGGI. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 92:1(2007), pp. 012153.012153-1-012153.012153-4.
Local lattice dynamics and negative thermal expansion in crystals
M. DAPIAGGIUltimo
2007
Abstract
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.
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