Thermodynamic measurement of La–Fe and Y–Fe alloys by multi-Knudsen cell mass spectrometry

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

“…Considering the difficulty in obtaining accurate Dy activity as pointed out by Nagai et al [69] themselves, more weight was put on the phase diagram data in the present optimization. It should be mentioned that similar incoherencies of the data by Nagai et al [72] were also pointed out in our previous assessment for the Fe-La system. [31] The Fe-Dy system was thermodynamically assessed by Landin and Å gren, [60] Konar [41] and Konar et al [68] In the assessment done by Landin and Å gren, [60] the DH o 298 of the compounds were not constrained by the experimental data of Norgren et al [71] Moreover, their optimization was viable only above 527°C (800 K), and the magnetic contributions to the Gibbs energies of the compounds were not considered.…”

“…30. The binary phase diagram was investigated by Farkas and Bauer, [93] Domagala et al, [94] and Nagai et al [72] Farkas and Bauer [93] studied the Fe-rich side (up to 30 wt.% Y) by TA. The presence of YFe 5 and YFe 4 was analyzed by XRD and OM.…”

“…Domagala et al reported congruent meltings of YFe 3 , YFe 4 , and YFe 9 , but the incongruent melting of YFe 2 . As part of the thermodynamic study by Nagai et al [72] using KEMS, the phase transition was identified from the measured activity change at 1200-1300°C. The mutual solid solubility of Fe and Y is shown in Fig.…”

“…The magnetic contributions to C p functions obtained by several researchers [103][104][105][106] are listed in Table 2. The activities of Fe and Y at 1473 and 1573 K were derived by Nagai et al [72] from their KEMS experiment, as shown in Fig. 34.…”

Thermodynamic Measurements of Alloys and Compounds by Double Knudsen Cell Mass Spectrometry and Their Application to Materials Processing

“…We have, in past studies, applied the technique to various systems, including ironzinc 33) and rare earth alloys. 37,40,42,44,45) For example, activity measurements on copper-nickel (Cu-Ni) alloys are demonstrated here. Cu and Ni show a complete solid solubility at high temperatures as shown by the phase diagram 48) in Fig.…”