Abstract
Li(H2O)2−x[Zr2(PO4)3] (x = 0) was synthesized under mild hydrothermal conditions. The crystal structure (single-crystal X-ray diffraction (XRD) data: cubic, space group P213 (No. 198), a = 10.2417(1) A, V = 1074.28(2) A3, Z = 4) contains a langbeinite-framework consisting of ZrO6 octahedra and PO4 tetrahedra sharing common corners. H2O molecules (crystal water) occupy the large cages extending along the 3-fold axes, thereby completing the langbeinite-type structural arrangement: {(H2O)2[Zr2(PO4)3]}− vs K2[Mg2(SO4)3]. The filled langbeinite variant is completed by additional Li+ ions taking positions between two neighboring water molecules and via the formation of linear arrangements H2O···Li+···OH2. The thermochemical properties of Li(H2O)2−x[Zr2(PO4)3] (0 ≤ x ≤ 2) were studied by thermogravimetry−differential thermal analysis (TG-DTA), as well as by isothermal annealing combined with powder XRD investigations. Above 200 °C, the crystal water of the cubic hydrate is irreversibly released and the dehydrate...
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