Kristallstrukturen aus CaBe 2 Ge 2 ‐ und CeMg 2 Si 2 ‐analogen Blöcken: Die Phosphide Ln Pt 2 P 2−x ( Ln : La, Sm)

Crystal Structures of CaBe 2 Ge 2 and CeMg 2 Si 2 analogous Units: The Phosphides Ln Pt 2 P 2−x ( Ln : La, Sm) Single crystals of LaPt 2 P 1.44 ( a = 4.174(1), c = 19.212(5) Å) were grown by reaction of vaporous phosphorus with LaPt 2 at 1050 °C during two weeks, whereas SmPt 2 P 1.50 ( a = 4.131(1), c = 19.086(4) Å) was synthesized by heating mixtures of the elements at 900 and 1100 °C (60 h) and annealing at 1050 °C (300 h). Both phosphides were investigated by single crystal X‐ray methods. Their crystal structures ( I 4/ mmm ; Z = 4) consist of CaBe 2 Ge 2 and CeMg 2 Si 2 analogous units alternating with each other along [001]. The positions of the P1 atoms are occupied incompletely causing the deviation to the 1:2:2 stoichiometry. Another compounds Ln Pt 2 P 2−x were studied by X‐ray powder diffraction resulting in the following lattice constants: a = 4.150(1), c = 19.132(5) Å for CePt 2 P 2–x , a = 4.137(1), c = 19.085(4) Å for PrPt 2 P 2−x , and a = 4.127(1), c = 19.040(2) Å for NdPt 2 P 2−x .