Thermodynamic Properties of Alkali Silicates: Heat Capacity of Li2SiO3 and Lithium-Bearing Melts

The heat capacities of liquid Li2SiO3 and Li2Si3O7 have been determined through drop calorimetry measurements to complement available data on lithium, sodium, and potassium silicate melts. The composition and temperature dependences of the heat capacity depends specifically on the nature of the alka...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-09, Vol.75 (9), p.2601-2604
Main Authors: Téqui, Christophe, Grinspan, Paul, Richet, Pascal
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Thermal properties of condensed matter
Thermal properties of liquids: heat capacity, thermal expansion
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Summary:The heat capacities of liquid Li2SiO3 and Li2Si3O7 have been determined through drop calorimetry measurements to complement available data on lithium, sodium, and potassium silicate melts. The composition and temperature dependences of the heat capacity depends specifically on the nature of the alkali element, indicating that the temperature‐induced structural changes that take place in the melts are specific. The properties of crystalline Li2SiO3 have also been determined above 298 K. The enthalpy of fusion at 1474 K is 71.3 ± 0.6 kJ/mol, in agreement with previous measurements. In contrast to other silicate compounds, and especially the isostructural crystal Na2SiO3, Li2SiO3 shows almost no premelting effects.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb05621.x