Phase diagram of the system NaF-SnF2 |
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| Authors: | V. Dvořák V. Danielik O. Matal Marta Chrenková M. Boca |
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| Affiliation: | (1) Department of Power Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic;(2) Department of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia;(3) ENERGOVYZKUM, Ltd., Božetěchova 17, 61200 Brno, Czech Republic;(4) Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia |
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| Abstract: | The phase diagram of the binary system NaF-SnF2 was determined by using the thermal analysis method. In addition to the crystallisation fields of pure components the formation of three other crystallisation fields was observed and these were attributed to the compounds: NaF·2SnF2, NaF·SnF2 and 2NaF·SnF2. The coordinates of the four eutectic points are: e 1: 70 mol% NaF, 30 mol% SnF2 and 255°C e 2: 58 mol% NaF, 42 mol% SnF2 and 238°C e 3: 44 mol% NaF, 56 mol% SnF2 and 246°C e 4: 18 mol% NaF, 82 mol% SnF2 and 191°C The model independent on the real structure of the melt was applied for the calculation of phase diagram comprising the calculation of excess molar Gibbs energy of mixing. The probable inaccuracy in the calculated phase diagram is σ=2.0°C. XRD analysis of solidified mixtures was performed in order to confirm the formation of expected compounds. |
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| Keywords: | excess molar Gibbs energy of mixing phase diagram thermal analysis tin fluoride |
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