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Figure 1 A view of the bicapped trigonal biprismatic [M2S12] unit (M=Nb/Ta) and its neighboring tetrahedral [PS4] groups. Yellow circles are S atoms, blue circles are Nb atoms, pink and dark green circles are P and K atoms, respectively. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry code: (v) 0.5 − x, y, −0.5 + z; (vi) −0.5 + x, −y, z; (viii) 1 − x, −y, −0.5 + z] |