We present our results in growing large single quasicrystals of the icosahe
dral phase in the Zn-Mg-Ho system with the top-seeded solution growth metho
d. We also show new results of investigations on the Zn-Mg-Y phase diagram
focussing on the sector with low Y content, to obtain some information abou
t the solidification behavior of the decagonal phase. In addition, the R-ph
ase, a novel cubic approximant for the icosahedral phase in the Zn-Mg-Er sy
stem, is presented. (C) 2000 Elsevier Science B.V. All rights reserved.