Lattice parameters and powder diffraction data for 14 RCo₂Ge₂ compounds (R=La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y)

Powder X-ray diffraction patterns were obtained for the series of synthesized compounds RCo₂Ge₂ with R = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y. The compounds have been indexed on the basis of a tetragonal unit cell with two formula units per cell. Except for YbCo₂Ge₂ the series shows the expected lanthanide contraction.