# Mg–Sm system

> Mg–Sm system: 65 accepted literature values (invariant reaction 44, phase transition 11, formation 8, phase equilibrium 1) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/MG-SM.html · Markdown: https://data.orchid-project.org/systems/MG-SM.md

65 accepted literature values from 3 paper(s) (experimental 43, model 22); 3 calculated phase diagram(s). 34 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/MG-SM.json) · [CSV](https://data.orchid-project.org/systems/MG-SM.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#MG-SM) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#MG-SM/MgSm-08Jia.json) · [phases (11)](https://data.orchid-project.org/phases/pages/MG-SM.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/MG-SM.html) · [Markdown](https://data.orchid-project.org/systems/MG-SM.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 43 |
| model | 22 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 44 |
| phase transition | 11 |
| phase equilibrium | 1 |
| formation | 8 |
| other property | 1 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| MgSm-08Jia.tdb | B.R. Jia, L.B. Liu, D.Q. Yi, Z.P. Jin, J.F. Nie, J. Alloys Compd., 459, 267-73(2008). [doi:10.1016/j.jallcom.2007.05.035](https://doi.org/10.1016/j.jallcom.2007.05.035) | `95e32e81e730e1eea4f60f3bd3f96b8b1c26158d2cf169d9d79719628ec7e38f` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SM/MgSm-08Jia.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSm-08Jia.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSm-08Jia.json) |
| MgSm-10Guo.tdb | C. Guo, Z. Du, C. Li, Calphad, 34, 90-97(2010). [doi:10.1016/j.calphad.2009.12.006](https://doi.org/10.1016/j.calphad.2009.12.006) | `74f15429343690e9d4a17d00f6a738e58e6be758714cfe34ac4b3d36b2374b4e` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SM/MgSm-10Guo.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSm-10Guo.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSm-10Guo.json) |
| MgSm-24Jia.tdb | R. Jiang, X. Duan, D. Li, C. He, J. Phase Equilib. Diffus., 45, 520-36(2024). [doi:10.1007/s11669-024-01111-0](https://doi.org/10.1007/s11669-024-01111-0) | `5a4755c28397807eadfc6a9619958f289a263dc81034417ae55a28a162a8eef6` | [viewer](https://orchid-project.org/phase-diagrams/#MG-SM/MgSm-24Jia.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MgSm-24Jia.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MgSm-24Jia.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| MgSm-08Jia.tdb | 1192.36 | RHOMB_C19 (x(Sm) 1) + BCC_A2 (x(Sm) 1) + HCP_A3 (x(Sm) 1) |
| MgSm-08Jia.tdb | 1062.68 | MGSM_B2 (x(Sm) 0.5) + LIQUID (x(Sm) 0.55211) + BCC_A2 (x(Sm) 0.69663) |
| MgSm-08Jia.tdb | 1062.68 | MGSM_B2 (x(Sm) 0.5) + LIQUID (x(Sm) 0.5522) + BCC_A2 (x(Sm) 0.69674) |
| MgSm-08Jia.tdb | 1012.54 | MG2SM_C15 (x(Sm) 0.33333) + LIQUID (x(Sm) 0.36644) + MGSM_B2 (x(Sm) 0.5) |
| MgSm-08Jia.tdb | 1012.54 | MG2SM_C15 (x(Sm) 0.33333) + LIQUID (x(Sm) 0.36683) + MGSM_B2 (x(Sm) 0.5) |
| MgSm-08Jia.tdb | 971.06 | LIQUID (x(Sm) 0.23819) + MG3SM_D03 (x(Sm) 0.25) + MG2SM_C15 (x(Sm) 0.33333) |
| MgSm-08Jia.tdb | 971.06 | LIQUID (x(Sm) 0.23829) + MG3SM_D03 (x(Sm) 0.25) + MG2SM_C15 (x(Sm) 0.33333) |
| MgSm-08Jia.tdb | 854.64 | MGSM_B2 (x(Sm) 0.5) + BCC_A2 (x(Sm) 0.78298) + HCP_A3 (x(Sm) 0.94144) |
| MgSm-08Jia.tdb | 854.64 | MGSM_B2 (x(Sm) 0.5) + BCC_A2 (x(Sm) 0.78306) + HCP_A3 (x(Sm) 0.94143) |
| MgSm-08Jia.tdb | 854.64 | MGSM_B2 (x(Sm) 0.5) + BCC_A2 (x(Sm) 0.78305) + HCP_A3 (x(Sm) 0.94143) |
| MgSm-08Jia.tdb | 836.43 | LIQUID (x(Sm) 0.11471) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.25) |
| MgSm-08Jia.tdb | 836.43 | LIQUID (x(Sm) 0.11459) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.25) |
| MgSm-08Jia.tdb | 836.43 | LIQUID (x(Sm) 0.11498) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.25) |
| MgSm-08Jia.tdb | 830.26 | MGSM_B2 (x(Sm) 0.5) + HCP_A3 (x(Sm) 0.94703) + RHOMB_C19 (x(Sm) 0.9504) |
| MgSm-08Jia.tdb | 830.25 | MGSM_B2 (x(Sm) 0.5) + HCP_A3 (x(Sm) 0.9473) + RHOMB_C19 (x(Sm) 0.95065) |
| MgSm-08Jia.tdb | 818.61 | LIQUID (x(Sm) 0.09885) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-08Jia.tdb | 818.61 | LIQUID (x(Sm) 0.09901) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-08Jia.tdb | 818.61 | LIQUID (x(Sm) 0.09868) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-08Jia.tdb | 810.47 | HCP_A3 (x(Sm) 0.00234) + LIQUID (x(Sm) 0.07974) + MG41SM5 (x(Sm) 0.1087) |
| MgSm-08Jia.tdb | 810.47 | HCP_A3 (x(Sm) 0.00234) + LIQUID (x(Sm) 0.0797) + MG41SM5 (x(Sm) 0.1087) |
| MgSm-10Guo.tdb | 1195 | HCP_A3 (x(Sm) 1) + B2_BCC (x(Sm) 1) + BCC_A2 (x(Sm) 1) |
| MgSm-10Guo.tdb | 1192.36 | RHOMB_C19 (x(Sm) 1) + B2_BCC (x(Sm) 1) + HCP_A3 (x(Sm) 1) |
| MgSm-10Guo.tdb | 1064.38 | B2_BCC (x(Sm) 0.51549) + LIQUID (x(Sm) 0.54438) + B2_BCC#2 (x(Sm) 0.69666) |
| MgSm-10Guo.tdb | 1064.38 | B2_BCC (x(Sm) 0.51549) + LIQUID (x(Sm) 0.54438) + B2_BCC#2 (x(Sm) 0.69666) |
| MgSm-10Guo.tdb | 1064.38 | B2_BCC (x(Sm) 0.51549) + LIQUID (x(Sm) 0.54438) + BCC_A2 (x(Sm) 0.69666) |
| MgSm-10Guo.tdb | 1064.38 | B2_BCC (x(Sm) 0.51549) + LIQUID (x(Sm) 0.54438) + BCC_A2 (x(Sm) 0.69666) |
| MgSm-10Guo.tdb | 1014.35 | MG2SM_C15 (x(Sm) 0.33333) + LIQUID (x(Sm) 0.3768) + B2_BCC (x(Sm) 0.49971) |
| MgSm-10Guo.tdb | 1014.35 | MG2SM_C15 (x(Sm) 0.33333) + LIQUID (x(Sm) 0.3768) + B2_BCC (x(Sm) 0.49971) |
| MgSm-10Guo.tdb | 973 | LIQUID (x(Sm) 0.23858) + MG3SM_D03 (x(Sm) 0.25) + MG2SM_C15 (x(Sm) 0.33333) |
| MgSm-10Guo.tdb | 973 | LIQUID (x(Sm) 0.23887) + MG3SM_D03 (x(Sm) 0.25) + MG2SM_C15 (x(Sm) 0.33333) |
| MgSm-10Guo.tdb | 852.98 | B2_BCC (x(Sm) 0.50944) + B2_BCC#2 (x(Sm) 0.8) + HCP_A3 (x(Sm) 0.97069) |
| MgSm-10Guo.tdb | 852.98 | B2_BCC (x(Sm) 0.50944) + B2_BCC#2 (x(Sm) 0.8) + HCP_A3 (x(Sm) 0.97069) |
| MgSm-10Guo.tdb | 852.98 | B2_BCC (x(Sm) 0.50944) + BCC_A2 (x(Sm) 0.8) + HCP_A3 (x(Sm) 0.97069) |
| MgSm-10Guo.tdb | 852.98 | B2_BCC (x(Sm) 0.50944) + BCC_A2 (x(Sm) 0.8) + HCP_A3 (x(Sm) 0.97069) |
| MgSm-10Guo.tdb | 838 | LIQUID (x(Sm) 0.1199) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.25) |
| MgSm-10Guo.tdb | 838 | LIQUID (x(Sm) 0.1199) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.25) |
| MgSm-10Guo.tdb | 838 | LIQUID (x(Sm) 0.12001) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.25) |
| MgSm-10Guo.tdb | 815.74 | LIQUID (x(Sm) 0.10039) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-10Guo.tdb | 815.74 | LIQUID (x(Sm) 0.10055) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-10Guo.tdb | 815.74 | LIQUID (x(Sm) 0.10032) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-10Guo.tdb | 806.12 | HCP_A3 (x(Sm) 0.00782) + LIQUID (x(Sm) 0.07924) + MG41SM5 (x(Sm) 0.1087) |
| MgSm-10Guo.tdb | 806.12 | HCP_A3 (x(Sm) 0.00779) + LIQUID (x(Sm) 0.07911) + MG41SM5 (x(Sm) 0.1087) |
| MgSm-10Guo.tdb | 751.52 | B2_BCC (x(Sm) 0.50465) + HCP_A3 (x(Sm) 0.98868) + RHOMB_C19 (x(Sm) 0.99196) |
| MgSm-10Guo.tdb | 751.52 | B2_BCC (x(Sm) 0.50465) + HCP_A3 (x(Sm) 0.98868) + RHOMB_C19 (x(Sm) 0.99196) |
| MgSm-24Jia.tdb | 1345 | BCC_A2 (x(Sm) 1) + LIQUID (x(Sm) 1) + MGSM_B2 (x(Sm) 1) |
| MgSm-24Jia.tdb | 1195 | HCP_A3 (x(Sm) 1) + MGSM_B2 (x(Sm) 1) + BCC_A2 (x(Sm) 1) |
| MgSm-24Jia.tdb | 1019.98 | MGSM_B2 (x(Sm) 0.50311) + LIQUID (x(Sm) 0.57853) + BCC_A2 (x(Sm) 0.65113) |
| MgSm-24Jia.tdb | 1019.98 | MGSM_B2 (x(Sm) 0.50311) + LIQUID (x(Sm) 0.57853) + BCC_A2 (x(Sm) 0.65113) |
| MgSm-24Jia.tdb | 989.85 | MG2SM_C15 (x(Sm) 0.34357) + LIQUID (x(Sm) 0.36822) + MGSM_B2 (x(Sm) 0.45449) |
| MgSm-24Jia.tdb | 989.85 | MG2SM_C15 (x(Sm) 0.34357) + LIQUID (x(Sm) 0.36822) + MGSM_B2 (x(Sm) 0.45449) |
| MgSm-24Jia.tdb | 973.09 | MG3SM_D03 (x(Sm) 0.24707) + LIQUID (x(Sm) 0.28373) + MG2SM_C15 (x(Sm) 0.33341) |
| MgSm-24Jia.tdb | 864.02 | MGSM_B2 (x(Sm) 0.50811) + BCC_A2 (x(Sm) 0.76481) + HCP_A3 (x(Sm) 0.9009) |
| MgSm-24Jia.tdb | 864.02 | MGSM_B2 (x(Sm) 0.50811) + BCC_A2 (x(Sm) 0.76481) + HCP_A3 (x(Sm) 0.9009) |
| MgSm-24Jia.tdb | 860.33 | LIQUID (x(Sm) 0.12103) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.21593) |
| MgSm-24Jia.tdb | 839.93 | LIQUID (x(Sm) 0.10683) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-24Jia.tdb | 839.93 | LIQUID (x(Sm) 0.1067) + MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) |
| MgSm-24Jia.tdb | 821.66 | HCP_A3 (x(Sm) 0.00858) + LIQUID (x(Sm) 0.07312) + MG41SM5 (x(Sm) 0.1087) |
| MgSm-24Jia.tdb | 821.66 | HCP_A3 (x(Sm) 0.00857) + LIQUID (x(Sm) 0.07306) + MG41SM5 (x(Sm) 0.1087) |
| MgSm-24Jia.tdb | 729.15 | MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.21731) |
| MgSm-24Jia.tdb | 729.15 | MG41SM5 (x(Sm) 0.1087) + MG5SM (x(Sm) 0.16667) + MG3SM_D03 (x(Sm) 0.21732) |
| MgSm-24Jia.tdb | 696.84 | MG3SM_D03 (x(Sm) 0.24989) + MG2SM_C15 (x(Sm) 0.33396) + MGSM_B2 (x(Sm) 0.4906) |
| MgSm-24Jia.tdb | 696.84 | MG3SM_D03 (x(Sm) 0.24989) + MG2SM_C15 (x(Sm) 0.33396) + MGSM_B2 (x(Sm) 0.4906) |
| MgSm-24Jia.tdb | 477.3 | MGSM_B2 (x(Sm) 0.50022) + HCP_A3 (x(Sm) 0.99074) + RHOMB_C19 (x(Sm) 1) |
| MgSm-24Jia.tdb | 477.3 | MGSM_B2 (x(Sm) 0.50022) + HCP_A3 (x(Sm) 0.99077) + RHOMB_C19 (x(Sm) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/MG/MG-SM.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/MG/MG-SM.json) · [CALPHAD hull MgSm-08Jia](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SM--MgSm-08Jia.json) · [CALPHAD hull MgSm-10Guo](https://data.orchid-project.org/hulls/calphad-sgte/MG/MG-SM--MgSm-10Guo.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Mg–Sm system (44)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1063 | eutectic: L -> Bcc(Sm) + MgSm | L: Sm 0.552; Bcc(Sm): Sm 0.697; MgSm: Sm 0.5 | model | [1] Jia 2008 | Table 2, p. 5, row 3; `ORC-IHJ2HOCUCM` |  |
| 1058.15 | eutectic: L ⇄ MgSm + γ-Sm | L: Sm 0.55; MgSm: Sm 0.5; γ-Sm: Sm 0.66 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 33; `ORC-GLJFWQF3DM` |  |
| 1058 | eutectic: L -> Bcc(Sm) + MgSm | L: Sm 0.55; Bcc(Sm): Sm 0.66; MgSm: Sm 0.5 | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 1; `ORC-OLPGDKN5RQ` |  |
| 1053 | eutectic: L -> Bcc(Sm) + MgSm | Bcc(Sm): Sm 0.676; MgSm: Sm 0.5 | experimental | [1] Jia 2008; _cites Kato 1963_ | Table 2, p. 5, row 2; `ORC-6UXB2MD3YF` |  |
| 1020.15 | eutectic: L ⇄ MgSm + γ-Sm | L: Sm 0.579; MgSm: Sm 0.503; γ-Sm: Sm 0.651 | model | [2] Jiang 2024 | Table 4, p. 14, row 31; `ORC-MC44QJ7COK` |  |
| 1017.15 | eutectic: L ⇄ MgSm + γ-Sm | L: Sm 0.55; MgSm: Sm 0.508; γ-Sm: Sm 0.648 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 32; `ORC-Y5MQ33GKBG` |  |
| 1013 | eutectic: L -> MgSm + Mg2Sm | L: Sm 0.366; MgSm: Sm 0.5; Mg2Sm: Sm 0.333 | model | [1] Jia 2008 | Table 2, p. 5, row 7; `ORC-7XUVD7TDPF` |  |
| 1008.15 | eutectic: L ⇄ Mg2Sm + MgSm | L: Sm 0.355; Mg2Sm: Sm 0.333; MgSm: Sm 0.5 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 24; `ORC-3VXE2R2LGN` |  |
| 1008 | eutectic: L -> MgSm + Mg2Sm | L: Sm 0.355; MgSm: Sm 0.5; Mg2Sm: Sm 0.333 | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 6; `ORC-DXALDBNLOP` |  |
| 993.15 | eutectic: L ⇄ Mg2Sm + MgSm | L: Sm 0.379; Mg2Sm: Sm 0.333; MgSm: Sm 0.5 | experimental | [2] Jiang 2024; _cites Zheng 1986_ | Table 4, p. 14, row 25; `ORC-YHJQJIF2RZ` |  |
| 990.15 | eutectic: L ⇄ Mg2Sm + MgSm | L: Sm 0.368; Mg2Sm: Sm 0.344; MgSm: Sm 0.455 | model | [2] Jiang 2024 | Table 4, p. 14, row 22; `ORC-LCCJGV6FSZ` |  |
| 988.15 | eutectic: L ⇄ Mg2Sm + MgSm | L: Sm 0.371; Mg2Sm: Sm 0.333; MgSm: Sm 0.455 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 23; `ORC-GCIPLDYKO5` |  |
| 973 | peritectic: L + Mg2Sm -> Mg3Sm | L: Sm 0.23; Mg2Sm: Sm 0.333; Mg3Sm: Sm 0.25 | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 10; `ORC-P645AAI2ZP` |  |
| 971 | peritectic: L + Mg2Sm -> Mg3Sm | L: Sm 0.238; Mg2Sm: Sm 0.333; Mg3Sm: Sm 0.25 | model | [1] Jia 2008 | Table 2, p. 5, row 11; `ORC-EAO7TUPUG6` |  |
| 970.15 | eutectic: L ⇄ Mg2Sm + Mg3Sm | L: Sm 0.256; Mg2Sm: Sm 0.309; Mg3Sm: Sm 0.25 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 18; `ORC-KOMGRY6PIU` |  |
| 885 | eutectoid: Bcc(Sm) -> Hcp(Sm) + MgSm | Bcc(Sm): Sm 0.755; MgSm: Sm 0.5 | experimental | [1] Jia 2008; _cites Kato 1963_ | Table 2, p. 5, row 18; `ORC-6VVHBWPUHZ` |  |
| 866.15 | eutectoid: γ-Sm ⇄ MgSm + β-Sm | γ-Sm: Sm 0.753; MgSm: Sm 0.502 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 35; `ORC-JRXUQ67Y25` |  |
| 864.15 | eutectoid: γ-Sm ⇄ MgSm + β-Sm | γ-Sm: Sm 0.765; MgSm: Sm 0.508; β-Sm: Sm 0.901 | model | [2] Jiang 2024 | Table 4, p. 14, row 34; `ORC-35DPRKKXNG` |  |
| 860.15 | peritectic: L + Mg3Sm ⇄ Mg5Sm | L: Sm 0.121; Mg3Sm: Sm 0.216; Mg5Sm: Sm 0.167 | model | [2] Jiang 2024 | Table 4, p. 14, row 9; `ORC-36HVLN6WBC` |  |
| 856.15 | peritectic: L + Mg3Sm ⇄ Mg5Sm | Mg3Sm: Sm 0.212; Mg5Sm: Sm 0.167 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 10; `ORC-E7H5C57BRH` |  |
| 855 | eutectoid: Bcc(Sm) -> Hcp(Sm) + MgSm | Bcc(Sm): Sm 0.783; Hcp(Sm): Sm 0.9414; MgSm: Sm 0.5 | model | [1] Jia 2008 | Table 2, p. 5, row 19; `ORC-SOICGT2E46` |  |
| 853.15 | peritectic: L + Mg3Sm ⇄ Mg5Sm | L: Sm 0.1; Mg3Sm: Sm 0.25; Mg5Sm: Sm 0.167 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 12; `ORC-22GSGDQOLY.617701` |  |
| 853.15 | eutectoid: γ-Sm ⇄ MgSm + β-Sm | γ-Sm: Sm 0.8; MgSm: Sm 0.5 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 36; `ORC-22GSGDQOLY.9f9509` |  |
| 853 | eutectoid: Bcc(Sm) -> Hcp(Sm) + MgSm | Bcc(Sm): Sm 0.8; MgSm: Sm 0.5 | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 17; `ORC-ZMJCY76SJ3` |  |
| 841.15 | peritectic: L + Mg5Sm ⇄ Mg41Sm5 | Mg5Sm: Sm 0.167; Mg41Sm5: Sm 0.109 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 7; `ORC-6EMGOGZI2W` |  |
| 840.15 | peritectic: L + Mg5Sm ⇄ Mg41Sm5 | L: Sm 0.107; Mg5Sm: Sm 0.167; Mg41Sm5: Sm 0.109 | model | [2] Jiang 2024 | Table 4, p. 14, row 6; `ORC-QVSSIPUZ5K` |  |
| 838.15 | peritectic: L + Mg3Sm ⇄ Mg5Sm | L: Sm 0.1; Mg3Sm: Sm 0.25; Mg5Sm: Sm 0.167 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 11; `ORC-MWPTPVV3CN` |  |
| 838 | peritectic: L + Mg3Sm -> Mg5Sm | L: Sm 0.1; Mg3Sm: Sm 0.25; Mg5Sm: Sm 0.167 | experimental | [1] Jia 2008; _cites Kinzhibalo 1985_ | Table 2, p. 5, row 12; `ORC-RQKSP2JUSS` |  |
| 836 | peritectic: L + Mg3Sm -> Mg5Sm | L: Sm 0.115; Mg3Sm: Sm 0.25; Mg5Sm: Sm 0.167 | model | [1] Jia 2008 | Table 2, p. 5, row 13; `ORC-RATO4TEHCQ` |  |
| 833.15 | peritectic: L + Mg5Sm ⇄ Mg41Sm5 | Mg5Sm: Sm 0.167; Mg41Sm5: Sm 0.109 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 8; `ORC-N4R4QEVIBB` |  |
| 821.15 | eutectic: L ⇄ Mg + Mg41Sm5 | L: Sm 0.073; Mg: Sm 0.009; Mg41Sm5: Sm 0.109 | model | [2] Jiang 2024 | Table 4, p. 14, row 1; `ORC-OOCZP5HSKV` |  |
| 820.15 | eutectic: L ⇄ Mg + Mg41Sm5 | L: Sm 0.08; Mg: Sm 0.009; Mg41Sm5: Sm 0.109 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 2; `ORC-QDY37O54JO` |  |
| 819 | peritectic: L + Mg5Sm -> Mg41Sm5 | L: Sm 0.099; Mg5Sm: Sm 0.167; Mg41Sm5: Sm 0.109 | model | [1] Jia 2008 | Table 2, p. 5, row 14; `ORC-BZXKD6RUTJ` |  |
| 815.15 | eutectic: L ⇄ Mg + Mg41Sm5 | Mg: Sm 0.01; Mg41Sm5: Sm 0.109 | experimental | [2] Jiang 2024; _cites Rokhlin 1976_ | Table 4, p. 14, row 5; `ORC-5QRPMGFRBX` |  |
| 813.15 | eutectic: L ⇄ Mg + Mg41Sm5 | L: Sm 0.08; Mg41Sm5: Sm 0.109 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 4; `ORC-UVQLB36F6Q` |  |
| 810 | eutectic: L -> Hcp + Mg41Sm5 | L: Sm 0.08; Hcp: Sm 0.002; Mg41Sm5: Sm 0.109 | model | [1] Jia 2008 | Table 2, p. 5, row 16; `ORC-2F2DTPC2XO` |  |
| 803.15 | eutectic: L ⇄ Mg + Mg41Sm5 | L: Sm 0.08; Mg41Sm5: Sm 0.109 | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 3; `ORC-SB6SYUCTXR` |  |
| 803 | eutectic: L -> Hcp + Mg41Sm5 | L: Sm 0.08; Mg41Sm5: Sm 0.109 | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 15; `ORC-LLN7PDMHPR` |  |
| 732 | eutectoid: Hcp(Sm) -> Rhom(Sm) + Mgm | Hcp(Sm): Sm 0.9677; Rhom(Sm): Sm 0.9715; Mgm: Sm 0.5 | model | [1] Jia 2008 | Table 2, p. 5, row 20; `ORC-6REXDOX2LF` |  |
| 731.15 | eutectoid: Mg5Sm ⇄ Mg41Sm5 + Mg3Sm | Mg5Sm: Sm 0.167; Mg41Sm5: Sm 0.109; Mg3Sm: Sm 0.217 | model | [2] Jiang 2024 | Table 4, p. 14, row 13; `ORC-QALH4W43UC` |  |
| 723.15 | eutectoid: Mg5Sm ⇄ Mg41Sm5 + Mg3Sm | Mg5Sm: Sm 0.167; Mg41Sm5: Sm 0.109; Mg3Sm: Sm 0.219 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 14; `ORC-FUBT5BFWHH` |  |
| 697.15 | eutectoid: Mg2Sm ⇄ Mg3Sm + MgSm | Mg2Sm: Sm 0.334; Mg3Sm: Sm 0.25; MgSm: Sm 0.491 | model | [2] Jiang 2024 | Table 4, p. 14, row 26; `ORC-DCXQOTEOTP.c28be2` |  |
| 697.15 | eutectoid: Mg2Sm ⇄ Mg3Sm + MgSm | Mg2Sm: Sm 0.324; Mg3Sm: Sm 0.25; MgSm: Sm 0.48 | experimental | [2] Jiang 2024 | Table 4, p. 14, row 27; `ORC-DCXQOTEOTP.d4d3f5` |  |
| 485.15 | eutectoid: β-Sm ⇄ MgSm + α-Sm | β-Sm: Sm 0.99; MgSm: Sm 0.5; α-Sm: Sm 0.999 | model | [2] Jiang 2024 | Table 4, p. 14, row 37; `ORC-UXUSXRA7Q6` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Mg–Sm system (8)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| RMg |  | -20 kJ/mol-atom | 298.15 | experimental |  |  | [3] Hampl 2013; _cites ref. 1992Cac_ | Table 6, p. 10, row 14; `ORC-BJWHZQ3FZT.a47ac5` |  |
| RMg |  | -19 kJ/mol-atom | 298.15 | experimental |  |  | [3] Hampl 2013; _cites ref. 1992Cac_ | Table 6, p. 10, row 14; `ORC-BJWHZQ3FZT.edb386` |  |
| RMg |  | -3.9 kJ/mol-atom | 298.15 | experimental |  |  | [3] Hampl 2013; _cites ref. 1967Ogr_ | Table 6, p. 10, row 13; `ORC-YT6SCNYYX5.398d97` |  |
| RMg2 |  | -23 kJ/mol-atom | 298.15 | experimental |  |  | [3] Hampl 2013; _cites ref. 1992Cac_ | Table 6, p. 10, row 14; `ORC-BJWHZQ3FZT.25e9d9` |  |
| RMg2 |  | -18 kJ/mol-atom | 298.15 | experimental |  |  | [3] Hampl 2013; _cites ref. 1992Cac_ | Table 6, p. 10, row 14; `ORC-BJWHZQ3FZT.aaac75` |  |
| SmMg | [MgSm](https://data.orchid-project.org/compounds/MgSm.html) | -3.9 kJ/mol-atom | 298.15 | experimental | -9.611 (mp-aaaaaduk) | -10.074 (oqmd-90153) | [3] Hampl 2013; _cites ref. 1967Ogr_ | Table 6, p. 10, row 13; `ORC-YT6SCNYYX5.2a1cae` |  |
| SmMg2 | [Mg2Sm](https://data.orchid-project.org/compounds/Mg2Sm.html) | -23 kJ/mol-atom | 298.15 | experimental | -8.453 (mp-aaaaaauj) | -9.092 (oqmd-17651) | [3] Hampl 2013; _cites ref. 1992Cac_ | Table 6, p. 10, row 14; `ORC-BJWHZQ3FZT.41c4e0` |  |
| SmMg2 | [Mg2Sm](https://data.orchid-project.org/compounds/Mg2Sm.html) | -18 kJ/mol-atom | 298.15 | experimental | -8.453 (mp-aaaaaauj) | -9.092 (oqmd-17651) | [3] Hampl 2013; _cites ref. 1992Cac_ | Table 6, p. 10, row 14; `ORC-BJWHZQ3FZT.2e7bc2` |  |

## Other properties

### Phase transition (11)

Table: Phase transition, Mg–Sm system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 983.15 K | 983.15 | congruent melting: L ⇄ Mg3Sm; _L: Sm 0.244; Mg3Sm: Sm 0.25_ | model | [2] Jiang 2024 | Table 4, p. 14, row 15; `ORC-MEHFKVXHDG.c83095` |  |
| Phase transition | 995.15 K | 995.15 | congruent melting: L ⇄ Mg2Sm; _L: Sm 0.339; Mg2Sm: Sm 0.333333_ | model | [2] Jiang 2024 | Table 4, p. 14, row 19; `ORC-MT65WOVKNU` |  |
| Phase transition | 1003.15 K | 1003.15 | congruent melting: L ⇄ Mg2Sm; _L: Sm 0.324; Mg2Sm: Sm 0.333333_ | experimental | [2] Jiang 2024 | Table 4, p. 14, row 20; `ORC-3RMAY5KD66` |  |
| Phase transition | 1017 K | 1017 | congruent melting: L -> Mg2Sm; _L: Sm 0.333; Mg2Sm: Sm 0.333_ | model | [1] Jia 2008 | Table 2, p. 5, row 9; `ORC-SFI3YDRPZD` |  |
| Phase transition | 1023 K | 1023 | congruent melting: L -> Mg2Sm; _L: Sm 0.333; Mg2Sm: Sm 0.333_ | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 8; `ORC-FIGQZCP7HY` |  |
| Phase transition | 1023.15 K | 1023.15 | congruent melting: L ⇄ Mg2Sm; _L: Sm 0.333; Mg2Sm: Sm 0.333333_ | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 21; `ORC-6IGWRET62L` |  |
| Phase transition | 1043.15 K | 1043.15 | congruent melting: L ⇄ MgSm; _L: Sm 0.486; MgSm: Sm 0.5_ | model | [2] Jiang 2024 | Table 4, p. 14, row 28; `ORC-7MZTJEM2XQ` |  |
| Phase transition | 1047.15 K | 1047.15 | congruent melting: L ⇄ MgSm; _L: Sm 0.48; MgSm: Sm 0.5_ | experimental | [2] Jiang 2024 | Table 4, p. 14, row 29; `ORC-YUS3BXXQG2` |  |
| Phase transition | 1069 K | 1069 | congruent melting: L -> MgSm; _L: Sm 0.5; MgSm: Sm 0.5_ | model | [1] Jia 2008 | Table 2, p. 5, row 5; `ORC-ZBQ2KDA6F7` |  |
| Phase transition | 1073 K | 1073 | congruent melting: L -> MgSm; _L: Sm 0.5; MgSm: Sm 0.5_ | experimental | [1] Jia 2008; _cites Saccone 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990169-0) | Table 2, p. 5, row 4; `ORC-7GWVDSBFTT` |  |
| Phase transition | 1073.15 K | 1073.15 | congruent melting: L ⇄ MgSm; _L: Sm 0.5; MgSm: Sm 0.5_ | experimental | [2] Jiang 2024; _cites Saccone 1989_ | Table 4, p. 14, row 30; `ORC-2SQST3P2J2` |  |

### Phase equilibrium (1)

Table: Phase equilibrium, Mg–Sm system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  |  | Mgsm; _Mgsm: Mg 0.521, Sm 0.479_ | experimental | [2] Jiang 2024 | Table 2, p. 5, row 31; `ORC-3T4BOFL43Q` |  |

### Other property (1)

Table: Other property, Mg–Sm system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Other; _printed: solid solubility range_ | 5 at.% Sm | 988.15 |  | experimental | [2] Jiang 2024 | p. 9; `ORC-GUBAAQKDSH` | “The maximum solid solubility range for MgSm is about 5 at.% Sm at 715 C, decreasing to 2 at.% Sm at 400 C.” |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. B.R. Jia, L.B. Liu, D.Q. Yi, Z.P. Jin, J.F. Nie, Thermodynamic assessment of the Al–Mg–Sm system, Journal of Alloys and Compounds 459, 267-273 (2008). [doi:10.1016/j.jallcom.2007.05.035](https://doi.org/10.1016/j.jallcom.2007.05.035)
2. Ruyi Jiang, Xiaofen Duan, Dashi Li, Cuiyun He, Re-investigation of the Phase Equilibria and Thermodynamic Assessment of the Mg-Sm Binary System, J. Phase Equilib. Diffus. 45, 520-536 (2024). [doi:10.1007/s11669-024-01111-0](https://doi.org/10.1007/s11669-024-01111-0)
3. M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013). [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).