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The equiatomic indide ScPtIn (ZrNiAl type, space group  P6  ‾$&amp;#x203e;{6}$2 m ) shows an extended solid solution Sc 3 Pt 3–x In 3 . Several samples of the Sc 3 Pt 3–x In 3  series were synthesized from the elements by arc-melting and subsequent annealing, or directly in a high frequency furnace. The lowest platinum content was observed for Sc 3 Pt 2.072(3) In 3 . All samples were characterized by powder X-ray diffraction and their lattice parameters and several single crystals were studied on the basis of precise single crystal X-ray diffractometer data. The correct platinum occupancy parameters were refined from the diffraction data. Decreasing platinum content leads to decreasing  a  and  c  lattice parameters. Satellite reflections were observed for the Sc 3 Pt 3–x In 3  crystals with  x  = 0.31–0.83. These satellite reflections could be described with a modulation vector(    1  3   ,   1  3   ,  γ   )$\left(\frac{1}{3},\frac{1}{3},\gamma \right)$(γ  =   1  2$\gamma =\frac{1}{2}$c * for all crystals) and are compatible with trigonal symmetry. The interplay of platinum filled vs. empty In 6  trigonal prisms is discussed for an approximant structure with space group  P 3 m 1.

Superstructure formation in the solid solution Sc 3 Pt 3−x In 3 (x = 0–0.93)