Revised heat capacity and thermodynamic functions of GdVO4

Heat capacity of RVO4 (R = La-Gd) orthovanadates

“…These results are presented in Tables 2 and 3. Figure 3 shows the data on the heat capacity of GdVO 4 , which were obtained at 370-1000 K by the authors of this work and at 5-345 K in [9]. It is seen that there is a good agreement between these results.…”

“…The data on thermodynamic properties of rare earth orthovana dates are needed to find optimal conditions of the syn thesis and to refine phase equilibrium states by the thermodynamic methods. Presently, the data on heat capacity of these compounds (LaVO 4 , LuVO 4 [8], GdVO 4 [9], DyVO 4 [10], ScVO 4 [11], YVO 4 [12], PrVO 4 , NdVO 4 , SmVO 4 , EuVO 4 , GdVO 4 , TbVO 4 [13]) have been obtained primarily for low temperatures. At high temperatures, these data are available for YVO 4 [14].…”

Heat capacity and thermodynamic functions of Gd(VO4)0.5(PO4)0.5 solid solution in the low-temperature region

“…The thermodynamic functions (entropy S 0 (T), enthalpy change H 0 (T) -H 0 (0), and reduced Gibbs energy Φ 0 (T)) were calculated from = 52.31 ± 0.11 J/(K mol). The low temperature region of the С р (Т) curve was found to have a heat capacity anomaly like that found for gadolinium orthophosphate and orthovanadate [2][3][4]. Since both gadolinium orthophosphate and gadolinium orthovanadate are classified with the com pounds that have no Schottky anomaly, this anomaly can be hypothesized to relate only to a change in mag netic properties.…”

“…Studies of the fundamental thermodynamic properties of some representatives of these classes of compounds can enable one to deter mine the existence regions of solid solutions by com putational methods and to expand the existing notions of the structure types themselves. We should mention that low temperature heat capacities were earlier measured for monoclinic gadolinium orthophosphate with a monazite structure by Gurevich et al [2] and by Thiriet et al [3] and for tetragonal gadolinium ortho vanadate with a xenotime structure by Gavrichev et al [4]. In those studies, a heat capacity anomaly with a minimum at 1.2 K due to transition from the antifer romagnetic state to a paramagnetic state was found to occur in the region of the lowest temperature.…”

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]. …”