On oxoacidic properties and solubilities of beryllium and magnesium oxides in molten (CsCs + KCl + NaCl) eutectic at T = 783 K |
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| Institution: | 1. Institute for Scintillation Materials, National Academy of Sciences of Ukraine, Lenin Avenue, 60, Kharkov 61001, Ukraine;2. Karazin Kharkov National University, Svobody Sq., 4, Kharkov 61077, Ukraine;1. Division of Radiochemistry and Engineering, Shanghai Institute of Applied Physics (SINAP), Chinese Academy of Sciences (CAS), Shanghai 201800, China;2. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, Shanghai 201800, China;3. Center of Excellence TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. ICTM–Department of Electrochemistry, University of Belgrade, Njego?eva 12, Belgrade, Serbia;2. Institute for Multidisciplinary Research, University of Belgrade, Kneza Vi?eslava 1a, Belgrade, Serbia;1. LAS/INPE-Instituto Nacional de Pesquisas Espaciais, Av. dos Astronautas 1758, São José dos Campos-SP, Brazil;2. Universidade Federal de São Paulo, Instituto de Ciência e Tecnologia, R. Talin 330, José dos Campos-SP, Brazil |
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| Abstract: | Reactions of Be2+ and Mg2+ with O2– in molten eutectic mixture (CsCs + KCl + NaCl) (0.455:0.245:0.30) at T = 783 K were studied by a potentiometric method using Pt(O2)|ZrO2(Y2O3) indicator electrode. Addition of O2– ions to the melt containing Mg2+ results in precipitation of MgO (pKs,MgO = 11.89 ± 0.3, molality) whereas interaction of Be2+ with O2– is accompanied with sequential formation of Be2O2+ (pK = 15.68 ± 0.5, molality) and precipitation of BeO (pKs,BeO = 9.62 ± 0.3, molality). On the basis of the obtained and known data pKs,MgO–T?1 dependence in molten (CsCs + KCl + NaCl) eutectic is constructed. The slope of the said dependence in T/K = (from 583 to 1073) range is in good agreement with the value predicted by the Shreder equation, that extends the range of use of the Shreder equation for predictions of metal oxide solubilities in molten halides. |
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