Thermodynamic functions of erbium orthophosphate ErPO4 in the temperature range of 0–1600K

Hydrothermal transport, deposition, and fractionation of the REE: Experimental data and thermodynamic calculations

“…There are far fewer data for xenotime. With the exception of the study of , solubility products for xenotime have only been measured at room temperature (Liu and Byrne (1997) Gavrichev et al (2006Gavrichev et al ( , 2010Gavrichev et al ( , 2012Gavrichev et al ( , 2013aGavrichev et al ( , 2013b and Gysi et al (2016). The data for Ho and Tm phosphates unfortunately are restricted to determinations of the enthalpy of formation (Navrotsky et al, 2015) and therefore, without corresponding data on the temperature dependency of heat capacity, cannot be used for calculations at elevated temperature.…”

“…In selecting the dataset appropriate for these compounds, we used the same approach as for monazite. The values of the standard Gibbs free energies were derived from the data of Liu and Byrne (1997), the values for entropy were taken from Navrotsky et al (2015), and the high-temperature heat capacity dependencies were those determined by Gavrichev et al (2006Gavrichev et al ( , 2010Gavrichev et al ( , 2012Gavrichev et al ( , 2013aGavrichev et al ( , 2013b and Gysi et al (2016). This dataset was used to calculate the solubility products for Y, Dy, Er, and Yb xenotime end-members at temperatures up to 300°C, and the resulting values compared with the experimental determinations of .…”

Investigation on thermophysical properties of RE6UO12(s) (RE=La, Pr, Nd, Sm)

“…The accuracy in various energy levels can be verified from the measured and calculated Schottky heat capacity. This type of correlation of heat capacity with spectroscopy data is largely studied for compounds like RE2O3 [33][34][35][36][37][38][39][40][41], RE2S3 [42][43][44][45][46][47], RE (OH)3 [48][49][50][51][52] and REPO4 [53][54][55][56][57][58][59][60][61][62][63][64]. …”

Heat capacity and thermodynamic functions of SmPO4 at 10–1600 K

“…Thus, in attempt to conjugate as seamless as possible the low and high temperature heat capacity curves, we made use of the second approach, namely, conjugated the enthalpies (Gurevich et al, 2004(Gurevich et al, , 2012Gavrichev et al, 2009Gavrichev et al, , 2012. The temperature func tion of heat capacity in the low temperature region (which was determined by the adiabatic technique) and the enthalpy change Н 0 (Т)-Н 0 (0) calculated on this basis are determined very accurately, with errors of roughly equal order of a few tenths of a percent.…”

“…(2). For the high temperature region (484.0-1566.4 K), we applied the ADE equation (Gurevich et al, 2004(Gurevich et al, , 2012Gavrichev et al, 2009Gavrichev et al, , 2012 with an absolute term b 0…”