HIGH TEMPERATURE HEAT CONTENT AND FUSION PROPERTIES FOR BINARY CARBONATE MIXTURES. LI,K|CO3 AND NA,K|CO3
Technical rept. no. 21
RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CHEMISTRY
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Enthalpy changes between temperatures ranging from 150 to 900 deg C were measured by drop calorimetry for the equimolar Na, KCO3 minimum melting mixture m. pt. 710 deg C and the equimolar Li, KCO3 mixture m. pt. 505 deg C. Heats of fusion kcalmol thus determined are Na, KCO3, 4.7 Li, KCO3, 8.7 respectively. Entropies of fusion and specific heats are likewise reported. The heat of mixing kcalmol and the excess entropy of mixing caldeg mol at 898 deg C are, respectively, 1.8 and 0.2 for the Na, KCO3 mixture, and -0.1 and -1.5 for the Li, KCO3 mixture. The thermodynamic relations are discussed.