Key indicators Powder X-ray study T = 295 K Mean (P-O) = 0.016 Å R factor = 0.066 wR factor = 0.089 Data-to-parameter ratio = 7.9 For details of how these key indicators were automatically derived from the article, see The crystal structure of barium tetraammonium poly{hexakis[phosphate(V)]} was solved by direct methods from laboratory X-ray powder diffraction data collected at room temperature. The trigonal crystal structure is isostructural with BaCs 4 (PO 3 ) 6 . The Ba 2+ cation and one of

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... he N atoms lie on a threefold axis, whereas all remaining non-H atoms are in general positions. The Ba 2+ cation is bonded to nine O atoms from three polyphosphate chains to form a distorted tricapped trigonal prism as coordination polyhedron. Links between the polyphosphate chains and the Ba 2+ ions result in a threedimensional network, with tunnels and cavities filled by ammonium cations.