EXAFS and thermal expansion

Dalba, G.; Fornasini, P.; Grisenti, R.; Rocca, F.
May 2000
AIP Conference Proceedings;2000, Vol. 514 Issue 1, p148
Academic Journal
The sensitivity of EXAFS to thermal expansion has been experimentally studied on several crystals: Ge, CdSe, and AgI. In no case does the first cumulant reproduce the thermal expansion, owing to relative atomic vibrations normal to the bond. By converse, EXAFS can give original information on the average perpendicular relative displacement <Δu ⊥2>. The thermal expansion of germanium can be determined from the 3rd cumulant, provided that quantum effects are taken into account. For CdSe and AgI, on the contrary, the 3rd cumulant does not reproduces the thermal expansion. © 2000 American Institute of Physics.


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