# C–Mn system

> C–Mn system: 100 accepted literature values (invariant reaction 45, formation 31, crystal structure 23, phase transition 1) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/C-MN.html · Markdown: https://data.orchid-project.org/systems/C-MN.md

100 accepted literature values from 2 paper(s) (experimental 39, model 40, DFT 21); 0 calculated phase diagram(s). 6 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/C-MN.json) · [CSV](https://data.orchid-project.org/systems/C-MN.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#C-MN) · [phases (13)](https://data.orchid-project.org/phases/pages/C-MN.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/C-MN.html) · [Markdown](https://data.orchid-project.org/systems/C-MN.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 39 |
| model | 40 |
| DFT | 21 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 45 |
| phase transition | 1 |
| formation | 31 |
| crystal structure | 23 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/C/C-MN.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/C/C-MN.json) · [CALPHAD hull MnC-10Dju](https://data.orchid-project.org/hulls/calphad-sgte/C/C-MN--MnC-10Dju.json) · [CALPHAD hull MnC-18Tan](https://data.orchid-project.org/hulls/calphad-sgte/C/C-MN--MnC-18Tan.json) · [CALPHAD hull MnC-89Lee](https://data.orchid-project.org/hulls/calphad-sgte/C/C-MN--MnC-89Lee.json) · [CALPHAD hull MnC-90Hua-LB](https://data.orchid-project.org/hulls/calphad-sgte/C/C-MN--MnC-90Hua-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the C–Mn system (45)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1608 | peritectic: L^a + CGraphite -> Mn7C3 | L: C 0.284563, Mn 0.715437; Mn7C3: C 0.3, Mn 0.7 | experimental | [1] Djurovic 2010; _cites Schurmann 1977_ | Table 4, p. 6, row 12; `ORC-JPRZS536O4` |  |
| 1606 | peritectic: L^a + CGraphite -> Mn7C3 | L: C 0.266252, Mn 0.733748; Mn7C3: C 0.3, Mn 0.7 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 10; `ORC-T6ZFBMHREB` |  |
| 1604 | peritectic: L^a + CGraphite -> Mn7C3 | Mn7C3: C 0.3, Mn 0.7 | experimental | [1] Djurovic 2010; _cites Yamada 2006_ [doi](https://doi.org/10.1088/0026-1394/43/5/n01) | Table 4, p. 6, row 11; `ORC-CYTN44DP6O` |  |
| 1598 | peritectic: L^a + CGraphite -> Mn7C3 | L: C 0.27394, Mn 0.72606; Mn7C3: C 0.3, Mn 0.7 | model | [1] Djurovic 2010 | Table 4, p. 6, row 9; `ORC-5Y67S3W366` |  |
| 1581 | peritectoid: L + Mn7C3 -> ε-Mn^a | Mn7C3: C 0.3, Mn 0.7; ε-Mn: C 0.244569, Mn 0.755431 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 14; `ORC-V2W2BE6QYY` |  |
| 1575 | peritectoid: L + Mn7C3 -> ε-Mn^a | Mn7C3: C 0.3, Mn 0.7; ε-Mn: C 0.247255, Mn 0.752745 | model | [1] Djurovic 2010 | Table 4, p. 6, row 13; `ORC-Q5YR2OUZZX` |  |
| 1573 | peritectoid: L + Mn7C3 -> ε-Mn^a | Mn7C3: C 0.3, Mn 0.7; ε-Mn: C 0.225984, Mn 0.774016 | experimental | [1] Djurovic 2010; _cites Schurmann 1977_ | Table 4, p. 6, row 15; `ORC-6FILQFE3RG` |  |
| 1533 | eutectic: L^a -> ε-Mn + γ-Mn | L: C 0.104973, Mn 0.895027 | experimental | [1] Djurovic 2010; _cites Schurmann 1977_ | Table 4, p. 6, row 8; `ORC-FM2FTDMM6C` |  |
| 1516 | eutectic: L^a -> ε-Mn + γ-Mn | L: C 0.101881, Mn 0.898119 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 6; `ORC-CPRXXWZROG` |  |
| 1509 | eutectic: L^a -> δ-Mn + γ-Mn | L: C 0.039884, Mn 0.960116 | experimental | [1] Djurovic 2010; _cites Schurmann 1977_ | Table 4, p. 6, row 4; `ORC-TQ56IQUJW5` |  |
| 1508 | eutectic: L^a -> ε-Mn + γ-Mn | L: C 0.13282, Mn 0.86718 | model | [1] Djurovic 2010 | Table 4, p. 6, row 5; `ORC-26NKFKCOOJ` |  |
| 1507 | eutectic: L^a -> δ-Mn + γ-Mn | L: C 0.009984, Mn 0.990016 | model | [1] Djurovic 2010 | Table 4, p. 6, row 1; `ORC-H47JCUPRQR` |  |
| 1506 | eutectic: L^a -> δ-Mn + γ-Mn | L: C 0.014024, Mn 0.985976 | experimental | [1] Djurovic 2010; _cites Fenstad 2007_ [doi](https://doi.org/10.3139/146.101563) | Table 4, p. 6, row 3; `ORC-2GIG25FEGZ` |  |
| 1504 | eutectic: L^a -> δ-Mn + γ-Mn | L: C 0.011334, Mn 0.988666 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 2; `ORC-WE45HSFK2O` |  |
| 1502 | eutectic: L^a -> ε-Mn + γ-Mn | L: C 0.133187, Mn 0.866813 | experimental | [1] Djurovic 2010; _cites Fenstad 2007_ [doi](https://doi.org/10.3139/146.101563) | Table 4, p. 6, row 7; `ORC-GH6SNQKTRK` |  |
| 1444 | peritectoid: ε-Mn^a + Mn7C3 -> Mn5C2 | ε-Mn: C 0.234292, Mn 0.765708; Mn7C3: C 0.3, Mn 0.7; Mn5C2: C 0.285714, Mn 0.714286 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 17; `ORC-OREKZCQ5ZP` |  |
| 1440 | peritectoid: ε-Mn^a + Mn7C3 -> Mn5C2 | ε-Mn: C 0.234597, Mn 0.765403; Mn7C3: C 0.3, Mn 0.7; Mn5C2: C 0.285714, Mn 0.714286 | model | [1] Djurovic 2010 | Table 4, p. 6, row 16; `ORC-NC4XRLTHJ6` |  |
| 1363 | peritectoid: ε-Mn^a + Mn7C3 -> Mn5C2 | Mn7C3: C 0.3, Mn 0.7; Mn5C2: C 0.285714, Mn 0.714286 | experimental | [1] Djurovic 2010; _cites Benz 1973_ [doi](https://doi.org/10.1007/bf02665426) | Table 4, p. 6, row 18; `ORC-ED5C7IIWX3` |  |
| 1325 | peritectoid: ε-Mn^a + Mn5C2 -> Mn3C | ε-Mn: C 0.218488, Mn 0.781512; Mn5C2: C 0.285714, Mn 0.714286; Mn3C: C 0.25, Mn 0.75 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 21; `ORC-MQSXRHDIB4` |  |
| 1323 | peritectoid: ε-Mn^a + Mn5C2 -> Mn3C | Mn5C2: C 0.285714, Mn 0.714286; Mn3C: C 0.25, Mn 0.75 | experimental | [1] Djurovic 2010; _cites Benz 1973_ [doi](https://doi.org/10.1007/bf02665426) | Table 4, p. 6, row 22; `ORC-DRGF5IDHOG` |  |
| 1323 | peritectoid: ε-Mn^a + Mn5C2 -> Mn3C | Mn5C2: C 0.285714, Mn 0.714286; Mn3C: C 0.25, Mn 0.75 | experimental | [1] Djurovic 2010; _cites Kuo 1954_ | Table 4, p. 6, row 23; `ORC-KNBDYQ3WUD` |  |
| 1323 | peritectoid: ε-Mn^a + Mn7C3 -> Mn5C2 | Mn7C3: C 0.3, Mn 0.7; Mn5C2: C 0.285714, Mn 0.714286 | experimental | [1] Djurovic 2010; _cites Kuo 1954_ | Table 4, p. 6, row 19; `ORC-PH25R2ZJRK` |  |
| 1319 | peritectoid: ε-Mn^a + Mn5C2 -> Mn3C | ε-Mn: C 0.209926, Mn 0.790074; Mn5C2: C 0.285714, Mn 0.714286; Mn3C: C 0.25, Mn 0.75 | model | [1] Djurovic 2010 | Table 4, p. 6, row 20; `ORC-MUSIMAXX44` |  |
| 1307 | peritectoid: ε-Mn^a + Mn3C -> Mn23C6 | ε-Mn: C 0.211841, Mn 0.788159; Mn3C: C 0.25, Mn 0.75; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 25; `ORC-TKNKLD5JKI` |  |
| 1300 | peritectoid: ε-Mn^a + Mn3C -> Mn23C6 | ε-Mn: C 0.203171, Mn 0.796829; Mn3C: C 0.25, Mn 0.75; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010 | Table 4, p. 6, row 24; `ORC-N2W6MQXGEW` |  |
| 1298 | peritectoid: ε-Mn^a + Mn3C -> Mn23C6 | Mn3C: C 0.25, Mn 0.75; Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Kuo 1954_ | Table 4, p. 6, row 27; `ORC-L5YX6KQLAA` |  |
| 1293 | peritectoid: ε-Mn^a + Mn3C -> Mn23C6 | Mn3C: C 0.25, Mn 0.75; Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Benz 1973_ [doi](https://doi.org/10.1007/bf02665426) | Table 4, p. 6, row 26; `ORC-DDC4YRDUQR` |  |
| 1263 | eutectoid: ε-Mn^a -> γ-Mn + Mn23C6 | ε-Mn: C 0.160778, Mn 0.839222; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 29; `ORC-7ISLEJO25G` |  |
| 1263 | eutectoid: ε-Mn^a -> γ-Mn + Mn23C6 | Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Benz 1973_ [doi](https://doi.org/10.1007/bf02665426) | Table 4, p. 6, row 31; `ORC-U663XNXKOS` |  |
| 1260 | eutectoid: ε-Mn^a -> γ-Mn + Mn23C6 | ε-Mn: C 0.148761, Mn 0.851239; Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Sichen 1989_ [doi](https://doi.org/10.1007/bf02655933) | Table 4, p. 6, row 30; `ORC-NBQ7LZID5U` |  |
| 1259 | eutectoid: ε-Mn^a -> γ-Mn + Mn23C6 | ε-Mn: C 0.162175, Mn 0.837825; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010 | Table 4, p. 6, row 28; `ORC-6APA3K2V54` |  |
| 1244 | eutectoid: Mn3C -> Mn5C2 + Mn23C6 | Mn3C: C 0.25, Mn 0.75; Mn5C2: C 0.285714, Mn 0.714286; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 33; `ORC-6F4HEOMVOM` |  |
| 1243 | eutectoid: Mn3C -> Mn5C2 + Mn23C6 | Mn3C: C 0.25, Mn 0.75; Mn5C2: C 0.285714, Mn 0.714286; Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Benz 1973_ [doi](https://doi.org/10.1007/bf02665426) | Table 4, p. 6, row 34; `ORC-QB5HYDZ447` |  |
| 1241 | eutectoid: Mn3C -> Mn5C2 + Mn23C6 | Mn3C: C 0.25, Mn 0.75; Mn5C2: C 0.285714, Mn 0.714286; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010 | Table 4, p. 6, row 32; `ORC-SPCUP4NW2K` |  |
| 1240 | eutectoid: Mn3C -> Mn5C2 + Mn23C6 | Mn3C: C 0.25, Mn 0.75; Mn5C2: C 0.285714, Mn 0.714286; Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Zaitsev 2004_ [doi](https://doi.org/10.1023/b:dopc.0000025219.06217.03) | Table 4, p. 6, row 35; `ORC-F6IHGWFUDC` |  |
| 1163 | eutectoid: γ-Mn^a -> α-Mn + Mn23C6 | Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Benz 1973_ [doi](https://doi.org/10.1007/bf02665426) | Table 4, p. 6, row 43; `ORC-S7EXD26F7X` |  |
| 1130 | peritectoid: β-Mn + γ-Mn -> α-Mn^a | α-Mn: C 0.039884, Mn 0.960116 | experimental | [1] Djurovic 2010; _cites Isobe 1951_ | Table 4, p. 6, row 38; `ORC-C2ZYV34EWT` |  |
| 1113 | peritectoid: β-Mn + γ-Mn -> α-Mn^a | α-Mn: C 0.035576, Mn 0.964424 | experimental | [1] Djurovic 2010; _cites Vogel 1935_ [doi](https://doi.org/10.1002/srin.193500743) | Table 4, p. 6, row 39; `ORC-4VR77UVA2N` |  |
| 1092 | peritectoid: β-Mn + γ-Mn -> α-Mn^a | α-Mn: C 0.029057, Mn 0.970943 | model | [1] Djurovic 2010 | Table 4, p. 6, row 36; `ORC-FNVOKXH2VG` |  |
| 1091 | peritectoid: β-Mn + γ-Mn -> α-Mn^a | α-Mn: C 0.028182, Mn 0.971818 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 37; `ORC-RR4BGEGF5S` |  |
| 1043 | eutectoid: γ-Mn^a -> α-Mn + Mn23C6 | γ-Mn: C 0.084182, Mn 0.915818; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 41; `ORC-OCIF5FQYKF` |  |
| 1038 | eutectoid: γ-Mn^a -> α-Mn + Mn23C6 | γ-Mn: C 0.086573, Mn 0.913427; Mn23C6: C 0.206897, Mn 0.793103 | model | [1] Djurovic 2010 | Table 4, p. 6, row 40; `ORC-2QS3SHIQ7X` |  |
| 1031 | eutectoid: γ-Mn^a -> α-Mn + Mn23C6 | γ-Mn: C 0.07897, Mn 0.92103; Mn23C6: C 0.206897, Mn 0.793103 | experimental | [1] Djurovic 2010; _cites Sichen 1989_ [doi](https://doi.org/10.1007/bf02655933) | Table 4, p. 6, row 42; `ORC-ABGIQDU2W6` |  |
| 701 | eutectoid: Mn5C2 -> Mn23C6 + Mn7C3 | Mn5C2: C 0.285714, Mn 0.714286; Mn23C6: C 0.206897, Mn 0.793103; Mn7C3: C 0.3, Mn 0.7 | model | [1] Djurovic 2010; _cites Huang 1990_ | Table 4, p. 6, row 45; `ORC-RBN6Z5PHK3` |  |
| 653 | eutectoid: Mn5C2 -> Mn23C6 + Mn7C3 | Mn5C2: C 0.285714, Mn 0.714286; Mn23C6: C 0.206897, Mn 0.793103; Mn7C3: C 0.3, Mn 0.7 | model | [1] Djurovic 2010 | Table 4, p. 6, row 44; `ORC-UJAQ5JHHWQ` |  |

## 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, C–Mn system (31)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Mn23C6 | [Mn23C6](https://data.orchid-project.org/compounds/Mn23C6.html) | -10.7 kJ/mol-atom | 298.15 | experimental | -9.077 (mp-aaabexac) | -9.296 (oqmd-12616) | [1] Djurovic 2010; _cites Zaitsev 2004_ [doi](https://doi.org/10.1023/b:dopc.0000025219.06217.03) | Table 5, p. 6, row 21; `ORC-6KV3VREDDJ` |  |
| Mn23C6 | [Mn23C6](https://data.orchid-project.org/compounds/Mn23C6.html) | -10.7 kJ/mol-atom | 298.15 | model | -9.077 (mp-aaabexac) | -9.296 (oqmd-12616) | [1] Djurovic 2010 | Table 5, p. 6, row 25; `ORC-L7KLN3LQXQ` |  |
| Mn23C6 | [Mn23C6](https://data.orchid-project.org/compounds/Mn23C6.html) | -10.6 kJ/mol-atom | 298.15 | model | -9.077 (mp-aaabexac) | -9.296 (oqmd-12616) | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 24; `ORC-LYU5WTFWW7` |  |
| Mn23C6 |  | -9.3 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 23; `ORC-CXOTQAHES3` |  |
| Mn23C6 | [Mn23C6](https://data.orchid-project.org/compounds/Mn23C6.html) | -8.5 kJ/mol-atom | 298.15 | experimental | -9.077 (mp-aaabexac) | -9.296 (oqmd-12616) | [1] Djurovic 2010; _cites Dawson 1980_ | Table 5, p. 6, row 22; `ORC-ZRYVGWZDKO` |  |
| Mn2C | [Mn2C](https://data.orchid-project.org/compounds/Mn2C.html) | -11.1 kJ/mol-atom | 298.15 | model |  | -4.319 (oqmd-1449601) | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 5; `ORC-7W3FL35XDW.be41bd` |  |
| Mn2C | [Mn2C](https://data.orchid-project.org/compounds/Mn2C.html) | -6 kJ/mol-atom | 298.15 | model |  | -4.319 (oqmd-1449601) | [1] Djurovic 2010 | Table 5, p. 6, row 6; `ORC-5KMTQSYDDA.931f6a` |  |
| Mn2C |  | -5.9 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 4; `ORC-NB2ABT2NJP.1a66e9` |  |
| Mn2Cb |  | -11.1 kJ/mol-atom | 298.15 | model |  |  | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 5; `ORC-7W3FL35XDW.64b10d` |  |
| Mn2Cb |  | -6 kJ/mol-atom | 298.15 | model |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 6; `ORC-5KMTQSYDDA.2b1555` |  |
| Mn2Cb |  | -5.9 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 4; `ORC-NB2ABT2NJP.e70760` |  |
| Mn3C | [Mn3C](https://data.orchid-project.org/compounds/Mn3C.html) | -10.1 kJ/mol-atom | 298.15 | model | -6.985 (mp-aaacppro) | -7.433 (oqmd-28884) | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 19; `ORC-QSSELAVV6G` |  |
| Mn3C | [Mn3C](https://data.orchid-project.org/compounds/Mn3C.html) | -9.9 kJ/mol-atom | 298.15 | experimental | -6.985 (mp-aaacppro) | -7.433 (oqmd-28884) | [1] Djurovic 2010; _cites Zaitsev 2004_ [doi](https://doi.org/10.1023/b:dopc.0000025219.06217.03) | Table 5, p. 6, row 17; `ORC-AAB4JQAAAM` |  |
| Mn3C |  | -9.9 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 18; `ORC-OBFYWOALKS` |  |
| Mn3C | [Mn3C](https://data.orchid-project.org/compounds/Mn3C.html) | -9.9 kJ/mol-atom | 298.15 | model | -6.985 (mp-aaacppro) | -7.433 (oqmd-28884) | [1] Djurovic 2010 | Table 5, p. 6, row 20; `ORC-QSJV6ODW6C` |  |
| Mn5C2 | [Mn5C2](https://data.orchid-project.org/compounds/Mn5C2.html) | -11 kJ/mol-atom | 298.15 | model | -6.465 (mp-aaaabhqz) | -6.859 (oqmd-12615) | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 15; `ORC-YFBAG5PEWK` |  |
| Mn5C2 | [Mn5C2](https://data.orchid-project.org/compounds/Mn5C2.html) | -10.6 kJ/mol-atom | 298.15 | model | -6.465 (mp-aaaabhqz) | -6.859 (oqmd-12615) | [1] Djurovic 2010 | Table 5, p. 6, row 16; `ORC-LO23EHAXWZ` |  |
| Mn5C2 | [Mn5C2](https://data.orchid-project.org/compounds/Mn5C2.html) | -10.6 kJ/mol-atom | 298.15 | experimental | -6.465 (mp-aaaabhqz) | -6.859 (oqmd-12615) | [1] Djurovic 2010; _cites Zaitsev 2004_ [doi](https://doi.org/10.1023/b:dopc.0000025219.06217.03) | Table 5, p. 6, row 12; `ORC-YT26FNPRDQ` |  |
| Mn5C2 | [Mn5C2](https://data.orchid-project.org/compounds/Mn5C2.html) | -8.9 kJ/mol-atom | 298.15 | experimental | -6.465 (mp-aaaabhqz) | -6.859 (oqmd-12615) | [1] Djurovic 2010; _cites Meschel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900023-6) | Table 5, p. 6, row 13; `ORC-O2O6P6SYRZ` |  |
| Mn5C2 |  | -8.4 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 14; `ORC-Y4EJXAPRA3` |  |
| Mn7C3 | [Mn7C3](https://data.orchid-project.org/compounds/Mn7C3.html) | -11.2 kJ/mol-atom | 298.15 | model | -6.564 (mp-aaaabflo) | -7.122 (oqmd-5937) | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 10; `ORC-BMDG3FMGCT` |  |
| Mn7C3 | [Mn7C3](https://data.orchid-project.org/compounds/Mn7C3.html) | -10.7 kJ/mol-atom | 298.15 | experimental | -6.564 (mp-aaaabflo) | -7.122 (oqmd-5937) | [1] Djurovic 2010; _cites Zaitsev 2004_ [doi](https://doi.org/10.1023/b:dopc.0000025219.06217.03) | Table 5, p. 6, row 7; `ORC-6JGCDBFOUR` |  |
| Mn7C3 | [Mn7C3](https://data.orchid-project.org/compounds/Mn7C3.html) | -10.7 kJ/mol-atom | 298.15 | model | -6.564 (mp-aaaabflo) | -7.122 (oqmd-5937) | [1] Djurovic 2010 | Table 5, p. 6, row 11; `ORC-SC2ZBIXWBV` |  |
| Mn7C3 | [Mn7C3](https://data.orchid-project.org/compounds/Mn7C3.html) | -9.1 kJ/mol-atom | 298.15 | experimental | -6.564 (mp-aaaabflo) | -7.122 (oqmd-5937) | [1] Djurovic 2010; _cites Meschel 1997_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900023-6) | Table 5, p. 6, row 8; `ORC-SGUG3UPZ7J` |  |
| Mn7C3 |  | -9 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 9; `ORC-JMRJXT246F` |  |
| MnC | [MnC](https://data.orchid-project.org/compounds/MnC.html) | 0 kJ/mol-atom | 298.15 | model |  | 6.813 (oqmd-1228614) | [1] Djurovic 2010 | Table 5, p. 6, row 3; `ORC-UPJRWTBPOR.9e8021` |  |
| MnC | [MnC](https://data.orchid-project.org/compounds/MnC.html) | 0.251 kJ/mol-atom | 298.15 | model |  | 6.813 (oqmd-1228614) | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 2; `ORC-YNE7X6MDXH.df93e2` |  |
| MnC |  | 24.5 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 1; `ORC-J2S6FP3OPD.a6dd9c` |  |
| MnCa |  | 0 kJ/mol-atom | 298.15 | model |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 3; `ORC-UPJRWTBPOR.0fa690` |  |
| MnCa |  | 0.251 kJ/mol-atom | 298.15 | model |  |  | [1] Djurovic 2010; _cites Huang 1990_ | Table 5, p. 6, row 2; `ORC-YNE7X6MDXH.ac3622` |  |
| MnCa |  | 24.5 kJ/mol-atom | 298.15 | DFT |  |  | [1] Djurovic 2010 | Table 5, p. 6, row 1; `ORC-J2S6FP3OPD.12abf9` |  |

## Other properties

### Phase transition (1)

Table: Phase transition, C–Mn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1389 K | 1389 | other: L = y + M3C | experimental | [2] Huang 1990 | p. 2; `ORC-B4LSBTBYHC` | “They established six invariant equilibria and a minimum on the univariant line L = y + M3C at 51 wt pct Mn and 1389 K.” |

### Crystal structure (23)

Table: Crystal structure, C–Mn system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 10.595 Å | 298.15 | Mn23C6; _alloy: Mn 0.793103_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 9; `ORC-KFEBYGNK6N` |  |
| Lattice a | 10.38 Å | 298.15 | Mn23C6; _alloy: Mn 0.793103_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 10; `ORC-TONDDTHCQ6` |  |
| Lattice a | 2.76 Å | 298.15 | Mn2C; _alloy: Mn 0.666667_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 2; `ORC-IY3PSBJ4WG.5a3459` |  |
| Lattice a | 5.103 Å | 298.15 | Mn3C; _alloy: Mn 0.75_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 7; `ORC-RDBW7J2A2I.f0e593` |  |
| Lattice a | 5.08 Å | 298.15 | Mn3C; _alloy: Mn 0.75_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 8; `ORC-WZNEMW7ZJD.04bf94` |  |
| Lattice a | 11.6724 Å | 298.15 | Mn5C2; _alloy: Mn 0.714286_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 5; `ORC-6REJE4HUTR.a3e964` |  |
| Lattice a | 11.53 Å | 298.15 | Mn5C2; _alloy: Mn 0.714286_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 6; `ORC-PXNYLWXDKK.8dd0de` |  |
| Lattice a | 4.543 Å | 298.15 | Mn7C3; _alloy: Mn 0.7_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 3; `ORC-LPZDMS5T77.2b3d42` |  |
| Lattice a | 4.45 Å | 298.15 | Mn7C3; _alloy: Mn 0.7_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 4; `ORC-MO7U6ZUOPI.bc7173` |  |
| Lattice a | 4.09 Å | 298.15 | MnC; _alloy: Mn 0.5_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 1; `ORC-H6KPQNJFQ5` |  |
| Lattice b | 6.787 Å | 298.15 | Mn3C; _alloy: Mn 0.75_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 7; `ORC-RDBW7J2A2I.abbd3c` |  |
| Lattice b | 6.77 Å | 298.15 | Mn3C; _alloy: Mn 0.75_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 8; `ORC-WZNEMW7ZJD.0fbef2` |  |
| Lattice b | 4.5864 Å | 298.15 | Mn5C2; _alloy: Mn 0.714286_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 5; `ORC-6REJE4HUTR.648ea9` |  |
| Lattice b | 4.47 Å | 298.15 | Mn5C2; _alloy: Mn 0.714286_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 6; `ORC-PXNYLWXDKK.afa1bd` |  |
| Lattice b | 6.9544 Å | 298.15 | Mn7C3; _alloy: Mn 0.7_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 3; `ORC-LPZDMS5T77.8008f8` |  |
| Lattice b | 6.8 Å | 298.15 | Mn7C3; _alloy: Mn 0.7_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 4; `ORC-MO7U6ZUOPI.01bb48` |  |
| Lattice c | 4.47 Å | 298.15 | Mn2C; _alloy: Mn 0.666667_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 2; `ORC-IY3PSBJ4WG.aafda8` |  |
| Lattice c | 4.545 Å | 298.15 | Mn3C; _alloy: Mn 0.75_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 7; `ORC-RDBW7J2A2I.a826d0` |  |
| Lattice c | 4.53 Å | 298.15 | Mn3C; _alloy: Mn 0.75_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 8; `ORC-WZNEMW7ZJD.c5aaaf` |  |
| Lattice c | 5.0969 Å | 298.15 | Mn5C2; _alloy: Mn 0.714286_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 5; `ORC-6REJE4HUTR.4a4652` |  |
| Lattice c | 4.99 Å | 298.15 | Mn5C2; _alloy: Mn 0.714286_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 6; `ORC-PXNYLWXDKK.d8c691` |  |
| Lattice c | 11.973 Å | 298.15 | Mn7C3; _alloy: Mn 0.7_ | experimental | [1] Djurovic 2010; _cites Bouchaud 1967_ | Table 3, p. 5, row 3; `ORC-LPZDMS5T77.410d2b` |  |
| Lattice c | 11.71 Å | 298.15 | Mn7C3; _alloy: Mn 0.7_ | DFT | [1] Djurovic 2010 | Table 3, p. 5, row 4; `ORC-MO7U6ZUOPI.c0b823` |  |

## Sources

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

1. Dejan Djurovic, Bengt Hallstedt, Jörg von Appen, Richard Dronskowski, Thermodynamic assessment of the Mn–C system, Calphad 34, 279-285 (2010). [doi:10.1016/j.calphad.2010.05.002](https://doi.org/10.1016/j.calphad.2010.05.002)
2. Weiming Huang, A thermodynamic assessment of the Fe-Mn-C system, Metall Trans A 21, 2115-2123 (1990). [doi:10.1007/bf02647870](https://doi.org/10.1007/bf02647870)

## 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-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); 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); 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.

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_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/).