Low-temperature heat capacities and thermodynamic properties of rare-earth triisothiocyanate hydrates .3. Sm(NCS)(3)center dot 6H(2)O, Gd(NCS)(3)center dot 6H(2)O, Yb(NCS)(3)center dot 6H(2)O and Y(NCS)(3)center dot 6H(2)O

The heat capacities of four RE isothiocyanate hydrates, Sm(NCS)(3) .6H2O, Gd(NCS)(3) .6H2O, Yb(NCS)(3) . 6H(2)O and Y(NCS)(3) .6H2O, have been measured from 13 to 300 K with a fully-automated adiabatic calorimeter. No obvious thermal anomaly was observed for the above-mentioned compounds in the experimental temperature ranges. The polynomial equations for calculating the heat capacities of the four compounds in the range of 13-300 K were obtained by the least-squares fitting based on the experimental C-p data. The C, values below 13 K were estimated by using the Debye-Einstein heat capacity functions. The standard molar thermodynamic functions were calculated from 0 to 300 K. Gibbs energies of formation were also calculated.