Single-crystal growth and phase diagram of Tb2Fe17 compound

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

“…5(c). Overall, the phase diagram study by Dariel et al [61] is reliable except the melting behavior of Tb 2 Fe 17 which was further properly examined by Chen et al [63] Figure 6(a) and (b) show the integral and partial enthalpies of mixing of liquid Fe and Tb measured by Ivanov et al [52] using a SC at 1833 K. Ivanov et al [52] measured the partial enthalpy of mixing of the Fe-rich alloys using zirconia crucible and Tb-rich compositions using molybdenum crucible. A smoothed equation for integral enthalpy of mixing was obtained with a minimum at 0.45 mol fraction Tb with a value of -5.06 ± 0.43 kJ mol -1 .…”

“…[41] Landin and Å gren [60] and Konar [41] suggested four stable intermetallic phases Tb 2 Fe 17 , Tb 6 Fe 23 , TbFe 3 , and TbFe 2 , which is characteristic of the Fe-heavy RE systems, in addition to bcc Fe, fcc Fe, hcp Tb, bcc Tb solution and liquid phase, based on the experimental study of Dariel et al [61] The phase diagram of the Fe-Tb system is shown in Fig. 5 along with experimental data by Dariel et al, [61] Orlova et al [62] and Chen et al [63] Dariel et al [61] used both TA and quenching experiments followed by XRD, OM, and electron probe microanalysis (EPMA) for phase analysis. Orlova et al [62] determined the melting point of the compounds by a pyrometer with an error of ± 50°C followed by compositional chemical analysis.…”

“…hcp Tb at 847°C. Recently, Chen et al [63] re-examined the phase diagram in the composition range of 0.045 to 0.1625 mol fraction Tb carefully using DTA (see Fig. 5 [63] reported the presence of only one polymorph of Tb 2 Fe 17 (Th 2 Ni 17 structure) from DTA study.…”

“…Recently, Chen et al [63] re-examined the phase diagram in the composition range of 0.045 to 0.1625 mol fraction Tb carefully using DTA (see Fig. 5 [63] reported the presence of only one polymorph of Tb 2 Fe 17 (Th 2 Ni 17 structure) from DTA study. According to Chen et al, [63] Tb 2 Fe 17 was observed at the solidification temperature with no homogeneity range.…”

“…5 [63] reported the presence of only one polymorph of Tb 2 Fe 17 (Th 2 Ni 17 structure) from DTA study. According to Chen et al, [63] Tb 2 Fe 17 was observed at the solidification temperature with no homogeneity range. As part of the phase diagram study of the Fe-Pt-Tb system, Gu et al [64] also confirmed the existence of a stoichiometric Tb 2 Fe 17 with Th 2 Zn 17 type rhombohedral structure at 900°C (1173 K) with XRD.…”