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Ye et al. J Mater Inf 2023;3:15 https://dx.doi.org/10.20517/jmi.2023.08 Page 3 of 37

The Fe-Ce binary system was experimentally investigated by different researchers [36-41] . Fe Ce and Fe Ce
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compounds were found to form through peritectic reactions. In terms of thermochemical properties of
liquid Fe-Ce alloys, the enthalpy of mixing and the partial enthalpy of mixing of Fe and Ce were measured
experimentally by different researchers [35,42-43] , while the enthalpy of formation of Fe Ce and Fe Ce was
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measured [44-45] .
Thermodynamic calculation of the Fe-La system was performed by several researchers [18,46] , and that of the
Fe-Ce system was performed [18,47] . In our previous work, the Fe-La and Fe-Ce binary systems were reassessed
in consideration of new measured experimental results . The calculated results of these two binary
[29]
systems are consistent well with the experimental information.
[29]
Fe-Pr and Fe-Nd
The Fe-Pr binary system has been experimentally studied [48-50] . According to the review [51,52] , Fe Pr is the
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only stable phase. There are two peritectic reactions, one peritectoid reaction, and one eutectic reaction. The
thermodynamic properties in liquid Fe-Pr alloys were determined , while the enthalpy of formation of
[53]
Fe Pr was reported in Refs [44,54] .
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Several researchers investigated the Fe-Nd binary system [55-59] . These experimental results [55-59] show that
Fe Nd is the only stable phase. However, the researchers [60,61] found that Fe Nd is also a stable
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intermetallic compound, and then the Fe-Nd phase diagram was revised accordingly. Okamoto [62,63]
reviewed the Fe-Nd binary system. The thermodynamic properties of liquid Fe-Pr alloys were
determined , while the enthalpy of formation of Fe Nd was reported [44,54] .
[53]
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The Fe-Pr binary system was calculated [18,64-66] , while the Fe-Nd system was calculated by several
authors [18,60,67-68] considering these two stable intermetallic compounds, Fe Nd and Fe Nd . In our previous
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[25]
work, the Fe-Pr and Fe-Nd binary systems were re-optimized considering new determined experimental
results. The calculated results of these two binary systems are in accordance with the experimental
[25]
information.
Fe-Sm and Fe-Gd
[69]
The Fe-Sm binary system has been determined by several authors . Three intermetallic compounds,
Fe Sm , Fe Sm, and Fe Sm, are formed (L + fcc-Fe ↔ Fe Sm , L + Fe Sm ↔ Fe Sm, L + Fe Sm ↔ Fe Sm).
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Using the high-temperature calorimetric method, the enthalpy of mixing and the partial enthalpy of mixing
at 1,829 K were determined , while the enthalpy of formation of Fe Sm was measured .
[70]
[44]
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The Fe-Gd binary system has been studied experimentally [71-78] . According to these measurements, four
Fe Gd , Fe Gd , Fe Gd, and Fe Gd intermetallic compounds are formed by the peritectic transformation.
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The thermodynamic properties of liquid Fe-Gd alloys were measured [53,79] . The enthalpy of formation of Fe 2
[81]
Gd was reported [44,80] . The enthalpy of formation of Fe Gd , Fe Gd, and Fe Gd was determined .
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The Fe-Sm binary system was calculated [18,82-83] , and the Fe-Gd binary system was evaluated [19,84-86] . The Fe-Sm
and Fe-Gd systems were reassessed in our previous work , and the calculations are in accordance with the
[26]
experimental information.
Fe-Ho and Fe-Tm
Roe et al. investigated the Fe-Ho binary system . Fe Ho , Fe Ho , and Fe Ho are formed by congruent
[87]
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melting, and Fe Ho forms through the peritectic transformation. Four eutectic reactions are separately
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