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Abstract
The decarbonation curve for ZnCO 3 has been determined in the pressure range 3–20 kbar by using a combination of cold-seal vessels and piston-cylinder apparatus with NaCl assemblies. Heat capacities for both synthetic and natural ZnCO 3 samples were measured by differential scanning calorimetry at temperatures ranging from 340 to 497 K. The results of these experiments indicate that the enthalpy of formation for smithsonite, ΔH f (1,298.15), is approximately −817. kJ/mol. which is about 4 kJ more negative than most tabulated values.
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