Media type: E-Article Title: EXAFS studies of negative thermal expansion materials Contributor: Fornasini, Paolo; Ahmed, Sameh I.; Sanson, Andrea; Vaccari, Marco Published: Wiley, 2008 Published in: physica status solidi (b), 245 (2008) 11, Seite 2497-2503 Language: English DOI: 10.1002/pssb.200880257 ISSN: 0370-1972; 1521-3951 Keywords: Condensed Matter Physics ; Electronic, Optical and Magnetic Materials Origination: Footnote: Description: AbstractExtended X‐ray absorption fine structure (EXAFS) can give information on the local dynamical behavior of crystals, opening new perspectives for understanding the origin of negative thermal expansion (NTE). In this paper, after a short review on the effects of thermal disorder in EXAFS spectra and on the relation between EXAFS and Bragg diffraction, some recent results on crystals with the zincblende and cuprite structures are presented and critically compared. The tension effect giving rise to NTE can be correlated to the anisotropy of the mean square relative displacements measured by EXAFS. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)