The crystal structures of the R12Ni6Pb (R=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho
) and the R12Co6Pb (R=Y: La, Pr, Nd, Sm, Gd) compounds were investigated by
powder X-ray diffraction method. They crystallize with Sm12Ni6In structure
type (space group Im3, Pearson code c138). (C) 2000 Elsevier Science S.A.
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