A. Navrotsky et al., THE BEHAVIOR OF H2O AND CO2 IN HIGH-TEMPERATURE LEAD BORATE SOLUTION CALORIMETRY OF VOLATILE-BEARING PHASES, The American mineralogist, 79(11-12), 1994, pp. 1099-1109
High-temperature oxide melt solution calorimetry with molten 2PbO.B2O3
as a solvent can be used for determining enthalpies of formation of c
arbonates and hydrous silicates. Under conditions of gas flow at 1-2 c
m3/s, all H2O and CO2 is expelled from the solvent, leading to a repro
ducible final thermodynamic state. Both analytical data and a number o
f thermodynamic cycles show that, under these conditions, the volatile
s neither dissolve in nor interact energetically with the melt.