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Thermodynamic properties of calcium aluminates

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j150619a028· OSTI ID:5949810
Enthalpy and entropy values for solid calcium aluminates have been compared with activity measurements and the known phase diagram to obtain improved revised values and an accurate calculated phase diagram for this binary system. The revised entropies (J mol/sup -1/ K/sup -1/) at 298/sup 0/K are 205.05 +- 0.8 for Ca/sub 3/Al/sub 2/O/sub 6/, 114.22 +- 0.8 for CaAl/sub 2/O/sub 4/, and 188.73 +- 0.8 for CaAl/sub 4/O/sub 7/. The excess enthalpy of mixing of CaO and AlO/sub 1/ /sub 5/ liquids has been calculated and plotted. Heats of fusion can be calculated from these values, but all the pure calcium aluminates melt incongruently.
Research Organization:
Montana State Univ., Bozeman
DOE Contract Number:
ET-78-C-01-3087
OSTI ID:
5949810
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 85:19; ISSN JPCHA
Country of Publication:
United States
Language:
English