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The title compound catena-poly[potassium [tri-μ-disulfido-μ-tetra­thiophos­pha­to-di[niobate(IV)/tantalate(IV)(0.885/0.115)]]], has been obtained through the reaction of the elements with KCl. The title compound is isostructural with KNb2PS10, with the Nb sites occupied by statistically disordered Nb (88.5%) and Ta (11.5%) atoms. The structure is composed of anionic 1[M2PS10] chains along [100] (M = Nb/Ta) and K+ ions. This chain is built up from distorted bicapped trigonal prisms [MS8] and [PS4] tetra­hedra. There are no inter­chain bonding inter­actions, except for electrostatic and van der Waals forces. The S22− and S2− anionic species and the M4+M4+ pair [MM = 2.8939 (3) Å] are observed. The classical charge balance is represented by [K+][M4+]2[PS43−][S22−]3.
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