TOF NEUTRON POWDER DIFFRACTION STUDIES ON F-ELECTRON SYSTEMS

The occurrence of quadrupolar ordering in tetragonal TmAu2 was investi gated by neutron powder diffraction. The present work revealed that a structural transition to an orthorhombic form occurs simultaneously. C eCu6 is a typical dense Kondo lattice compound. Appearance of a new Ko ndo state in CeInCu5 was studied crystallographically. The structure p arameters of CeInCu5 show that only one of 4c sites of space group Pnm a is fully occupied by In and that the rest of the four sites are comp letely by Cu. The decrease in one of the Ce-Cu(5) distances on In dopi ng was found, which might be related to the enhancement of T-K. (C) 19 98 Elsevier Science B.V. All rights reserved.