Thermodynamics of Ni richest intermetallics along the rare-earth series

Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y

“…At the time of previous assessments by Landin and Å gren, [60] and Konar, [41] no such experimental enthalpy of mixing data were available, hence the estimated enthalpies The optimized phase diagram of the Fe-Tb system with the experimental data (a) overall composition range, [61][62][63][64] (b) in the hightemperature region [61][62][63] (c) in the Fe-rich side are quite different from the present result as shown in Fig. 6 [65] and Meschel et al [55] are presented in Fig. 7.…”

“…11, the DH o 298 determined by the present assessment is depicted along with experimental data reported by Norgren et al, [71] Gozzi et al [65] and Meschel et al [55] The DH o 298 of DyFe 2 , DyFe 3 and Dy 2 Fe 17 were measured by Norgren et al [71] using SC-Al at 1100 K. The reported DH o 298 of compounds become more negative with increasing Dy content. Gozzi et al [65] and Meschel et al [55] reported DH o 298 of Dy 2 Fe 17 and DyFe 2 from EMF measurements and DSCa, respectively, and also conducted empirical Miedema calculations, as shown in Fig. 11.…”

“…The experimental data and estimated data from Miedema method are consistent within the experimental error limits. The experimental value of DH o 298 for Tb 2 Fe 17 was measured to be -2.1 ± 3.1 and -3.3 kJ mol-atom -1 by Meschel et al [55] and Gozzi et al, [65] respectively, which is reproduced as -2.45 kJ mol-atom -1 in the present optimization. The experimental DH o 298 value of TbFe 2 by Meschel et al was -5.5 ± 2.4 kJ mol-atom -1 and the present optimized value is about 1.5 kJ mol-atom -1 more negative than the experimental error range of their data.…”

“…7. Gozzi et al [65] reported the DH o 298 for the Tb 2 Fe 17 phase derived from the Gibbs energy of formation determined using galvanic cells with CaF 2 electrolyte. Meschel et al [55] determined the formation enthalpies of Tb 2 Fe 17 and TbFe 2 by DSCa, and also reported the predicted values from Miedema method.…”

“…The enthalpy of the liquid phase and the Gibbs energy of TbFe 2 were firstly optimized together with the phase diagram information in order to reproduce the [52] and assessments. [41,60] (a) Integral enthalpy of mixing and (b) partial enthalpy of mixing [55,65] Fig. 8 The optimized C p of TbFe 2 along with the experimental data [57] enthalpy of mixing by Ivanov et al [52] 17 and the bcc solution parameters were optimized to reproduce their phase stabilities.…”