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• W2054425480 abstract "The heat capacity and vibrational entropy of a calcium aluminate and three peraluminous calcium aluminosilicate glasses have been determined from 2 to 300 K by heat-pulse relaxation calorimetry. Together with previous adiabatic data for six other glasses in the system CaO–Al2O3–SiO2, these results have been used to determine partial molar heat capacities and entropies for five species namely, SiO2, CaO and three different sorts of Al2O3 in which Al is 4-, 5- and 6-fold coordinated by oxygen. Given the determining role of oxygen coordination on low-temperature heat capacity, the composition independent entropies found for SiO2 and CaO indicate that short-range order around Si and Ca is not sensitive to aluminum speciation up to the highest fraction of 25% observed for VAl by NMR spectroscopy. Because of the higher room-temperature vibrational entropy of IVAl2O3 (72.8 J/mol K) compared to VAl2O3 (48.5 J/mol K), temperature-induced changes from IVAl to VAl give rise to a small negative contribution of the order of 1 J/mol K to the partial molar configurational heat capacity of Al2O3 in melts. Near 0 K, pure SiO2 glass distinguishes itself by the importance of the calorimetric boson peak. On a g atom basis, the maximum of this peak varies with the composition of calcium aluminosilicate glasses by a factor of about 2. It does not show smooth variations, however, either as a function of SiO2 content, at constant CaO/Al2O3 ratio, or as a function of Al2O3 content, at constant SiO2 content." @default.
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• W2054425480 date "2009-07-01" @default.
• W2054425480 modified "2023-10-02" @default.
• W2054425480 title "Aluminum speciation, vibrational entropy and short-range order in calcium aluminosilicate glasses" @default.
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• W2054425480 doi "https://doi.org/10.1016/j.gca.2009.03.041" @default.
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