Table 1.

Measured enthalpies of drop solution and enthalpies of formation from oxides

Source	ΔHds, kJ/mol	ΔHf,ox, kJ/mol
Coffinite-F	−121.43 ± 1.54*	24.6 ± 3.1
	−102.01 ± 3.10†	26.7 ± 4.7
Coffinite-G	44.14 ± 0.94*	(−5.5 ± 3.5)
	44.14 ± 0.94*	24.1 ± 3.5‡
	44.39 ± 0.94*	23.9 ± 4.0§

^*Measured in 3Na₂O·4MoO₃ solvent.

^†Measured in 2PbO·B₂O₃ solvent.

^‡This value obtained from a correction considering the water was strongly bonded and its interaction enthalpy was assumed to be −80 kJ/mol.

^§This value obtained from a correction considering metaschoepite as an impurity phase containing all of the water.