Phase formation in the HfO(NO3)2-H3PO4-CsF(HF)-H2O system |
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| Authors: | M M Godneva A T Belyaevskii O A Zalkind |
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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, 184209, Russia
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| Abstract: | The phase formation in the system HfO(NO3)2-H3PO4-CsF(HF)-H2O was studied along the sections at the molar ratios PO 4 3? /Hf = 0.5, 1.5, and 2.0 and RbF:Hf = 1?C5, and also in the presence of HF at CsF: Hf = 1. The initial solutions contained 2?C24 wt % HfO2. The synthesis was performed at room temperature. The following substances were isolated: crystalline cesium fluorophosphate hafnates CsHf2F6PO4 · 4H2O, CsHfF2PO4 · 0.5H2O, and CsH2Hf2F2(PO4)3 · 2H2O; X-ray amorphous cesium fluorophosphate hafnate of the average composition Cs2Hf3O1.5F5(PO4)2 · 5H2O; and X-ray amorphous cesium fluorophosphate nitrate hafnate Cs5H4Hf3F7(PO4)3.66(NO3)3 · 5H2O. The compositions of the amorphous phases should be refined. Cesium fluorophosphate hafnates were obtained for the first time. The compounds were studied by crystal-optical, elemental, X-ray diffraction, IR spectroscopic, and electron microscopic analyses. |
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