The crystal structure of Tm2Ni12P7 has been determined by single crystal X-
ray diffraction. Tm2Ni12P7 crystallizes in the Zr2Fe12P7 structure type wit
h a=9.0577(13) Angstrom and c=3.6641(7) Angstrom. The sample was prepared b
y melting the elements in a tin flux. All crystals show racemic twinning. T
he long standing dispute over the the correct space group symmetry (P (6) o
ver bar or P6(3)/m) could be solved: Tm2Ni12P7 crystallizes in the non-cent
rosymmetric space group P (6) over bar. (C) 2000 Elsevier Science S.A. All
rights reserved.