Abstract
The diffuse scattering located close to Bragg reflections has been studied as a function of the temperature on a single grain of the AlPdMnicosahedral phase. Between 600°C and 800°C there is areversible and continuous transition. When the temperature increases, thediffuse scattering diminishes whereas high-Q⊥ reflections havetheir intensity increased. All results are well interpreted within theelasticity theory of quasi-crystals: the changes in diffuse scatteringshape and intensity when lowering the temperature are due to a softeningof the K1 phason elastic constant. The time decay of these long-wavelength phason fluctuations is larger than 5 ns.
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