Table 4.

Thermodynamic data at 25°C calculated from solubility experiments for rhabdophanes and using data from (Navrotsky et al., 2015) for monazites. Standard molar entropies are given as calculated from enthalpy and free energy of formation from oxides [${\text{S}}_{\text{m}}^{°}$(ox)] with Equation (9) and from elements [${\text{S}}_{\text{m}}^{°}$(el)] with Equation (10).

	$\Delta {\text{G}}_{\text{f},\text{el}}^{°}$,	$\Delta {\text{G}}_{\text{f},\text{ox}}^{°}$,	$\Delta {\text{S}}_{\text{f},\text{el}}^{°}$,	$\Delta {\text{S}}_{\text{f},\text{ox}}^{°}$,	$\Delta {\text{S}}_{\text{m}}^{°}$(ox),	$\Delta {\text{S}}_{\text{m}}^{°}$(el),
	J mol−1 K−1	J mol−1 K−1	J mol−1 K−1	J mol−1 K−1	J mol−1 K−1	J mol−1 K−1
RHABDOPHANES
LaPO4 · 0.804 H2O	−2036 ± 6	−313.1 ± 6.4	−618.7 ± 7.4	−100.2 ± 7.7	77.6 ± 7.8	77.1 ± 7.8
CePO4 · 0.732 H2O	−2012 ± 8	−303.3 ± 10.9	−594.9 ± 12.2	−83.9 ± 13.1	99.3 ± 13.1	96.7 ± 14.8
PrPO4 · 0.709 H2O	−2013 ± 8	−304.2 ± 9.6	−565.6 ± 10.2	−58.2 ± 11.3	125.7 ± 11.3	125.2 ± 11.0
NdPO4 · 0.746 H2O	−2013 ± 6	−295.2 ± 7.5	−556.7 ± 7.8	−48.5 ± 8.8	141.0 ± 8.8	139.8 ± 8.8
SmPO4 · 0.636 H2O	−1982 ± 10	−282.6 ± 10.5	−587.6 ± 11.1	−109.2 ± 11.3	82.0 ± 11.3	81.6 ± 11.3
EuPO4 · 0.555 H2O	−1869 ± 13	−280.2 ± 14.3	−580.3 ± 14.2	−77.0 ± 14.9	97.5 ± 15.0	81.3 ± 14.2
GdPO4 · 0.533 H2O	−1952 ± 5	−278.8 ± 6.1	−559.7 ± 8.7	−86.0 ± 7.2	85.6 ± 7.2	84.5 ± 8.8
MONAZITES
LaPO4	−1875 ± 5	−341.8 ± 6.7	−401.7 ± 7.5	−14.3 ± 7.9	107.1 ± 7.9	106.6 ± 8.0
CePO4	−1845 ± 10	−309.4 ± 11.2	−398.5 ± 12.5	−6.8 ± 13.3	125.0 ± 13.3	122.4 ± 15.0
PrPO4	−1860 ± 7	−319.1 ± 10.1	−415.3 ± 10.6	−23.5 ± 11.7	110.6 ± 11.7	110.1 ± 11.4
NdPO4	−1845 ± 6	−304.2 ± 7.9	−401.9 ± 8.1	−15.3 ± 9.1	121.8 ± 9.2	120.6 ± 9.2
SmPO4	−1847 ± 6	−298.7 ± 10.8	−398.5 ± 11.5	−10.3 ± 11.7	122.7 ± 11.7	122.4 ± 11.7
EuPO4	−1739 ± 6	−287.0 ± 14.6	−422.5 ± 14.4	0.4 ± 15.1	125.9 ± 15.2	109.7 ± 13.8
GdPO4	−1838 ± 7	−291.3 ± 6.4	−395.0 ± 8.9	−8.3 ± 7.6	125.9 ± 7.6	124.8 ± 8.8

All errors in the table are propagated as two standard deviations of the mean.