Abstract
Abstract : Enthalpy changes between temperatures ranging from 150 to 900 deg C were measured by drop calorimetry for the equimolar Na, K/CO3 minimum melting mixture (m. pt. 710 deg C) and the equimolar Li, K/CO3 mixture (m. pt. 505 deg C). Heats of fusion (kcal/mol) thus determined are: Na, K/CO3, 4.7; Li, K/CO3, 8.7 respectively. Entropies of fusion and specific heats are likewise reported. The heat of mixing (kcal/mol) and the excess entropy of mixing (cal/deg mol) at 898 deg C are, respectively, +1.8 and +0.2 for the Na, K/CO3 mixture, and -0.1 and -1.5 for the Li, K/CO3 mixture. The thermodynamic relations are discussed.
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