Abstract

The crystal structures of the R(Ag,Pb) 2 (R=Y, Er, Tm) compounds were investigated using X-ray powder diffraction. The compounds crystallize with the CaIn 2 structure type (space group P6 3/mmc , Pearson symbol hP6). The lattice parameters are following: a=4.7414(2) Å, c=7.4346(4) Å for YAg 0.78Pb 1.22; a=4.7170(2) Å, c=7.3711(4) Å for ErAg 0.70Pb 1.30 and a=4.7035(2) Å, c=7.3564(5) Å for TmAg 0.62Pb 1.38.

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