Phase formation in the ZrO(NO3)2-NaF(HF)-H3PO4-H2O system at 20°C

被引：0
|
作者：
M. M. Godneva
V. Ya. Kuznetsov
M. P. Rys’kina
V. V. Semushin
N. L. Mikhailova
机构：
[1] Russian Academy of Sciences,Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center
来源：
Russian Journal of Inorganic Chemistry | 2014年 / 59卷
关键词：
Differential Thermal Analysis; Differential Thermal Analysis Curve; Hydrogen Fluoride; Fluorozirconates; Lithium Phosphate;
D O I：
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中图分类号：
学科分类号：
摘要：
Phase formation in the ZrO(NO3)2-NaF(HF)-H3PO4-H2O system was studied at 20°C and 2.0–14.5 wt % ZrO2 in the initial solution along sections with molar ratios PO43−/Zr = 0.5 and 1.5 and also in the presence of hydrogen fluoride at Na/Zr = 1 and PO43−/Zr = 0.5, 1.0, and 1.5. Crystalline zirconium hydrophosphate Zr(HPO4)2 · H2O, fluorozirconates Na5Zr2F13 and Na7Zr6F31 · 12H2O, fluorophosphatozirconates NaH2Zr3F3(PO4)4 · 3H2O and NaZr2F6(PO4) · 4H2O, and amorphous NaZrO0.5F(PO4) · 4H2O (provisional composition) were separated at room temperature. NaH2Zr3F3(PO4)4 · 3H2O and NaZr2F6(PO4) · 4H2O were prepared for the first time and were studied by crystal-optical, elemental, and thermal analyses, X-ray powder diffraction, IR spectroscopy, scanning electron microscopy (SEM), and X-ray microanalysis. Na7Hf6F31 · 12H2O was found to exist in a mixture with the hydrophosphate.
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页码：849 / 857
页数：8
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