Synthesis of potassium fluorophosphate hafnates at 20°C |
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| Authors: | M M Godneva |
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| Institution: | 1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Research Center, Russian Academy of Sciences, ul. Fersmana 26A, Apatity, Murmansk oblast, 184200, Russia
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| Abstract: | Potassium fluorophosphate hafnates (PFPH) K3H3Hf3F3(PO4)5 and KHf2F3(PO4)2 · 2H2O were synthesized for the first time, and a KZr2F3(PO4)2 · 2H2O phase was found to exist. The compounds were studied by crystal-optical, elemental, X-ray powder diffraction, thermogravimetric, IR spectroscopic, and electron microscopic analyses. It was found that PFPH crystallize as one-dimensional nanoparticles. The IR spectra showed that PFPH K3H3M3F3(PO4)5 (M = Zr, Hf) are crystal solvate K3M3(PO4)5 · 3HF. Annealing of K3H3Hf3F3(PO4)5 and KHf2F3(PO4)2 · 2H2O at 1000°C gives rise to mixtures that mostly contain various phosphate hafnates. |
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