Ammonium oxofluorosilicates |
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| Authors: | E I Mel’nichenko G F Krysenko D G Epov T A Kaidalova |
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| Institution: | (1) Institute of Chemistry, Far-East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia |
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| Abstract: | The chemical and phase composition of the sublimates and nonvolatiles obtained as a result of the vaporization at 280°C of a mixture of silicon dioxide with (NH4)2SiF6 at ratios of (0.25–10): 1 (mol/mol) is studied. Ammonium oxofluorosilicates of the general formula (NH4)2SiF6 · nNH4SiOF3, where n = 1, 2, 4, or 8, are isolated from the gas phase and analyzed. These oxofluorosilicates have the structure of cubic (NH4)2SiF6, which allows them to be treated as solid solutions. The sublimate components (NH4)2SiF6 and NH4SiOF3 are in the ratio of 1: 2n, where n = 0, 1, 2, or 3. In the nonvolatile residue, the starting SiO2 undergoes deep chemical destruction. |
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