QUASI-CRYSTAL STRUCTURE - ONE DRAWBACK OF PATTERSON ANALYSES

Six-dimensional Patterson functions as measured for AlCuFe and AlPdMn perfect quasi-crystals show only two correlation features located at lattice sites and body centres of a cubic unit cell. They have been interpreted in terms of a CsCl-like 6-dim structure. In the present work, the uniqueness of this interpretation has been addressed. Another structure with weak mid-edge decoration happens to be also consistent with the observed Patterson functions. A significant 5% density difference should make a selection of the good model possible.