Abstract
Quantitative diffuse electron scattering in the vicinity of some Bragg reflections has been measured for the first time on a single Al 70.3Pd 21.5Mn 8.2 icosahedral quasicrystal in order to obtain information about elastic constants. The main contribution to the diffuse scattering comes from the phason disorder. The shape and the quantitative intensity distribution of diffuse scattering can be accounted for by considering only two phason elastic constants K 1 and K 2 with a ratio of K 2/ K 1=−0.50.
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