Abstract
The crystal structures of several new compounds have been determined using X-ray analysis. The intermetallic compound HoZn 5 Al 3 (a = 8.586(3), c = 16.538(5) Å , RF = 0.0413, RW = 0.0521) has its own structure type (space group I4/mmm), which has been found for the first time. The following compounds are isostructural with the previous one: YZn 5.52 Al 2.48 (a = 8.6183(1), c = 16.5048(3) Å , RI = 0.078, RP = 0.116), DyZn 4.96 Al 3.04 (a = 8.5887(1), c = 16.5002(3) Å , RI = 0.077, RP = 0.114), ErZn 5.37 Al 2.63 (a = 8.5525(2), c =16.3997(5) Å , RI = 0.081, RP = 0.111), TmZn 5.64 Al 2.36 (a = 8.70429(8), c = 16.3943(4) Å , RI = 0.088, RP = 0.095), LuZn 5.58 Al 2.42 (a = 8.5616(1), c= 16.3052(3) Å , RI =0.081, RP =0.101). The intermetallic compound Yb 4 Zn 20.3 Al 12.7 (a = 8.6183(1), c = 16.5048(3) Å , RI = 0.085, RP = 0.112) adopts the Yb 8 Cu 17 Al 49 - type structure (space group I4/mmm). The relationship between the HoZn 5 Al 3 -type and the Yb 8 Cu 17 Al 49 -type structures is discussed.