Crystal Growth and X-Ray Structure of Metastable «-KC0 PO
نویسندگان
چکیده
Crystals of KC0PO4 were obtained by growth in a gel of tetramethoxysilane/water at 64 °C. The hexagonal crystals have space group P 63, a = 18.206(1), c = 8.5135(8) [Ä], V = 2443.8(4) [A3]. Z = 24. The structure was solved by single crystal X-ray diffraction methods. The struc ture is isotypic with a-K Z nP 04. It comprises an ordered three dimensional network of alter nating CoÖ4 and P 0 4 tetrahedra. which has rings of six tetrahedra in the xy plane. These rings form tunnels in the [001] direction, where the potassium ions are located. Upon heating, the compound undergoes a phase transition at about 565 °C; on cooling, the phase transition occurs at 449 °C, where it transforms into another structure which is yet unknown. This indicates that the hexagonal structure is a metastable phase.
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