Decarbonation curves and associated thermodynamic data for synthetic Cd-dolomites CdMg(CO3)2, CdMn(CO3)2 and CdZn(CO3)2

Decarbonation curve for the synthetic dolomite analogues; (Cd-dolomites) were determined for CdMg(CO₃)₂, CdMn(CO₃)₂ and CdZn(CO₃)₂ under CO₂ pressure of up to 2.5 kbar. All the three double carbonates were completely disordered at the decomposition temperatures and hence the thermodynamic data (Standard enthalpy; ΔH _f ^o, Standard free energy; ΔG _f ^o) retrieved from the univariant decarbonation curve corresponds to the disordered phases. They are: The mixing enthalpies and free energies for the formation of the disordered 1∶1 solid solution phases are: The thermodynamic data (ΔH _f ^o, ΔG _f ^o and ΔH _r ^o, ΔG _r ^o) showed a positive correlation with the decomposition temperatures. The mixing energies of the disordered double carbonates also show a direct correlation with the cationic size differences.