Phosphosulfides with P/S = 1. The non-thiophosphate compounds with P/S = 1 in the MP database are an intermediate case between the two extremes of "textbook" P-S polyanions and separate P and S anions that are independent of each other. A common anionic motif is a simple P-S bond among materials containing two anions among O, P, N, S, and an arbitrary number of metals. The "synthesised" bar refers to materials that have also been synthesised in bulk form according to the ICSD database . b) Number of unique, thermodynamically stable PSs available in the MP database, grouped by number of elements and coloured by anion stoichiometry. Throughout this paper, "stable" means that the energy above the calculated stability hull (Ehull) is lower or equal to 0.2 eV. c) Summary of general features found in PSs grouped by the anion stoichiometry including the formula of the most common polyanions, the known oxidation states of phosphorus in these polyanions, their structure represented as a ball and stick model visualized with VESTA and the bonds found in the materials with the respective anion ratio. (as in FePS), or two P-S bonds linked by P-P bonds (as in PdPS). Unlike the case of thiophosphates, here P participates in bonding with the metal cations, so it typically appears in intermediate oxidation states (-1 or -2). Among the known compounds with P/S = 1, there are also cases where P-S bonds are completely absent and only metal-S and metal-P bonds exist as in conventional multi-anion materials like oxynitrides or oxyhalides. In these cases (such as YPS and TaPS) the P oxidation state can be between -3 and -1, depending on whether P only bonds to metal atoms or also to other P atoms.