# Mn–Nb system

> Mn–Nb system: 85 accepted literature values (crystal structure 64, phase equilibrium 19, invariant reaction 2) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

85 accepted literature values from 2 paper(s) (experimental 37, model 1, DFT 47); 3 calculated phase diagram(s). 9 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/MN-NB.json) · [CSV](https://data.orchid-project.org/systems/MN-NB.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#MN-NB) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#MN-NB/MnNb-12Liu-alt.json) · [phases (8)](https://data.orchid-project.org/phases/pages/MN-NB.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/MN-NB.html) · [Markdown](https://data.orchid-project.org/systems/MN-NB.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 37 |
| model | 1 |
| DFT | 47 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 2 |
| phase equilibrium | 19 |
| crystal structure | 64 |

## 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 |
|---|---|---|---|
| MnNb-12Liu-alt.tdb | S. Liu, B. Hallstedt, D. Music, Y. Du, Calphad, 38, 43-58(2012). [doi:10.1016/j.calphad.2012.03.004](https://doi.org/10.1016/j.calphad.2012.03.004) | `f865788210b7ea29500839eca161cb3231a53f18446937a3285d8634bbdd9dcd` | [viewer](https://orchid-project.org/phase-diagrams/#MN-NB/MnNb-12Liu-alt.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MnNb-12Liu-alt.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MnNb-12Liu-alt.json) |
| MnNb-12Liu.tdb | S. Liu, B. Hallstedt, D. Music, Y. Du, Calphad, 38, 43-58(2012). [doi:10.1016/j.calphad.2012.03.004](https://doi.org/10.1016/j.calphad.2012.03.004) | `a8a02382c71fadace40c49ba561dd5276b700015661dfc4881fc18ebec7a7525` | [viewer](https://orchid-project.org/phase-diagrams/#MN-NB/MnNb-12Liu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MnNb-12Liu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MnNb-12Liu.json) |
| MnNb-21Yan.tdb | X. Yan, P. Broz, J. Vrestal, J. Vlach, J. Bursik, M. Mazalova, J. Pavlu, B. Smetana, G. Rogl, M. Eiberger, A. Grytsiv, H. Michor, H. Mueller, G. Giester, P. Rogl, J. Alloys Compd., 865, 158715(2021). [doi:10.1016/j.jallcom.2021.158715](https://doi.org/10.1016/j.jallcom.2021.158715) | `cf0e7cf6818464d76fb3688bacaac8a519d845f044c2275d83a05e7bdbd26e7d` | [viewer](https://orchid-project.org/phase-diagrams/#MN-NB/MnNb-21Yan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/MnNb-21Yan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/MnNb-21Yan.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| MnNb-12Liu-alt.tdb | 1669.23 | C14_LAVES (x(Nb) 0.4169) + LIQUID (x(Nb) 0.5737) + BCC_A2 (x(Nb) 0.86689) |
| MnNb-12Liu-alt.tdb | 1496.75 | BCC_A2 (x(Nb) 0.02142) + LIQUID (x(Nb) 0.03775) + C14_LAVES (x(Nb) 0.29049) |
| MnNb-12Liu-alt.tdb | 1415.86 | BCC_A2 (x(Nb) 0.01587) + CUB_A13 (x(Nb) 0.02303) + C14_LAVES (x(Nb) 0.29045) |
| MnNb-12Liu-alt.tdb | 1394.7 | FCC_A1 (x(Nb) 0.00319) + BCC_A2 (x(Nb) 0.00509) + CUB_A13 (x(Nb) 0.00788) |
| MnNb-12Liu-alt.tdb | 990.48 | CUB_A13 (x(Nb) 0.00412) + CBCC_A12 (x(Nb) 0.00698) + C14_LAVES (x(Nb) 0.31539) |
| MnNb-12Liu.tdb | 1670.82 | C14_LAVES (x(Nb) 0.41222) + LIQUID (x(Nb) 0.57437) + BCC_A2 (x(Nb) 0.86737) |
| MnNb-12Liu.tdb | 1496.48 | BCC_A2 (x(Nb) 0.02167) + LIQUID (x(Nb) 0.03821) + C14_LAVES (x(Nb) 0.29525) |
| MnNb-12Liu.tdb | 1416.28 | BCC_A2 (x(Nb) 0.01611) + CUB_A13 (x(Nb) 0.02333) + C14_LAVES (x(Nb) 0.29508) |
| MnNb-12Liu.tdb | 1394.7 | FCC_A1 (x(Nb) 0.00319) + BCC_A2 (x(Nb) 0.00509) + CUB_A13 (x(Nb) 0.00788) |
| MnNb-12Liu.tdb | 1260.07 | C14_LAVES (x(Nb) 0.38008) + MU_D85 (x(Nb) 0.48006) + BCC_A2 (x(Nb) 0.95348) |
| MnNb-12Liu.tdb | 990.71 | CUB_A13 (x(Nb) 0.00421) + CBCC_A12 (x(Nb) 0.00713) + C14_LAVES (x(Nb) 0.31037) |
| MnNb-21Yan.tdb | 1766.61 | C14_LAVES (x(Nb) 0.40378) + LIQUID (x(Nb) 0.48018) + BCC_A2 (x(Nb) 0.83637) |
| MnNb-21Yan.tdb | 1489.4 | BCC_A2 (x(Nb) 0.03433) + LIQUID (x(Nb) 0.04948) + C14_LAVES (x(Nb) 0.2477) |
| MnNb-21Yan.tdb | 1420.9 | BCC_A2 (x(Nb) 0.02665) + FCC_A1 (x(Nb) 0.02785) + C14_LAVES (x(Nb) 0.24463) |
| MnNb-21Yan.tdb | 1326.58 | CUB_A13 (x(Nb) 0.01527) + FCC_A1 (x(Nb) 0.01986) + C14_LAVES (x(Nb) 0.24203) |
| MnNb-21Yan.tdb | 1080.17 | CUB_A13 (x(Nb) 0.00495) + CBCC_A12 (x(Nb) 0.02691) + C14_LAVES (x(Nb) 0.24043) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/MN/MN-NB.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/MN/MN-NB.json) · [CALPHAD hull MnNb-12Liu-alt](https://data.orchid-project.org/hulls/calphad-sgte/MN/MN-NB--MnNb-12Liu-alt.json) · [CALPHAD hull MnNb-12Liu](https://data.orchid-project.org/hulls/calphad-sgte/MN/MN-NB--MnNb-12Liu.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Mn–Nb system (2)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1395.15 | (δMn) ↔ (γMn) + (βMn) | (δMn): Nb 0.0051; (γMn): Nb 0.0032; (βMn): Nb 0.0079 | model | [1] Liu 2012 | Table 2, p. 4, row 62; `ORC-45NWT5QL6N` |  |
| 1393.15 | (δMn) ↔ (γMn) + (βMn) | (γMn): Nb 0.004 | experimental | [1] Liu 2012; _cites Hellawell 1959_ [doi](https://doi.org/10.1016/0022-5088%2859%2990036-0) | Table 2, p. 4, row 61; `ORC-RLCXV4QVEG` |  |

## Other properties

### Phase equilibrium (19)

Table: Phase equilibrium, Mn–Nb system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  |  | Eutectic + overall (EDX); _overall (EDX): Mn 0.95, Nb 0.05; Eutectic: Mn 0.951, Nb 0.049_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 9; `ORC-VFXIFUSYXT` |  |
| Phase composition |  |  | Matrix + Second phase + Eutectic + overall (EDX); _overall (EDX): Mn 0.413, Nb 0.587; Matrix: Mn 0.624, Nb 0.376; Second phase: Mn 0.182, Nb 0.818; Eutectic: Mn 0.468, Nb 0.532_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 18; `ORC-2UXBXSDMFY` |  |
| Phase composition |  |  | Matrix + Second phase + Eutectic + overall (EDX); _overall (EDX): Mn 0.53, Nb 0.47; Matrix: Mn 0.628, Nb 0.372; Second phase: Mn 0.194, Nb 0.806; Eutectic: Mn 0.484, Nb 0.516_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 16; `ORC-KI4RH5Y23G` |  |
| Phase composition |  |  | Matrix + Second phase + Eutectic + overall (EDX); _overall (EDX): Mn 0.959, Nb 0.041; Matrix: Mn 0.995, Nb 0.005; Second phase: Mn 0.758, Nb 0.242; Eutectic: Mn 0.952, Nb 0.048_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 6; `ORC-TDPN64CJO5` |  |
| Phase composition |  |  | Matrix + Second phase + Eutectic + η-Nb-Mn + overall (EDX); _overall (EDX): Mn 0.905, Nb 0.095; Matrix: Mn 0.992, Nb 0.008; Second phase: Mn 0.729, Nb 0.271; Eutectic: Mn 0.946, Nb 0.054; η-Nb-Mn: Mn 0.524, Nb 0.476_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 11; `ORC-L5C5GV2X2T` |  |
| Phase composition |  |  | Matrix + Second phase + Eutectic: Eutectic + overall (EDX); _overall (EDX): Mn 0.911, Nb 0.089; Matrix: Mn 0.994, Nb 0.006; Second phase: Mn 0.74, Nb 0.26_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 13; `ORC-5N74P7Z3R7` |  |
| Phase composition |  |  | Matrix + Second phase + η-Nb-Mn: Few small + overall (EDX); _overall (EDX): Mn 0.967, Nb 0.033; Matrix: Mn 0.986, Nb 0.014; Second phase: Mn 0.73, Nb 0.27_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 4; `ORC-3LYXAVMSH4` |  |
| Phase composition |  |  | Matrix + Second phase: Fine particles + η-Nb-Mn: Black holes + overall (EDX); _overall (EDX): Mn 0.99, Nb 0.01; Matrix: Mn 0.994, Nb 0.006_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 1; `ORC-OYNKA62UPO` |  |
| Phase composition |  |  | Matrix + η-Nb-Mn + overall (EDX); _overall (EDX): Mn 0.98, Nb 0.02; Matrix: Mn 0.985, Nb 0.015; η-Nb-Mn: Mn 0.547, Nb 0.453_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 2; `ORC-ZVLQASVFTO` |  |
| Phase composition |  |  | Second phase + η-Nb-Mn-O + overall (EDX); _overall (EDX): Mn 0.647, Nb 0.353; Second phase: Mn 0.653, Nb 0.347; η-Nb-Mn-O: Mn 0.457, Nb 0.448_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 15; `ORC-XO7LIA6F4Z` |  |
| Phase composition |  | 973.15 | Matrix + Second phase + η-Nb-Mn + overall (EDX); _overall (EDX): Mn 0.953, Nb 0.047; Matrix: Mn 0.963, Nb 0.037; Second phase: Mn 0.729, Nb 0.271; η-Nb-Mn: Mn 0.544, Nb 0.456_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 10; `ORC-IJ7XHMNVSD` |  |
| Phase composition |  | 1023.15 | Matrix + Second phase + η-Nb-Mn + overall (EDX); _overall (EDX): Mn 0.961, Nb 0.039; Matrix: Mn 0.967, Nb 0.033; Second phase: Mn 0.728, Nb 0.272; η-Nb-Mn: Mn 0.558, Nb 0.442_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 8; `ORC-HQRDE7KDBV` |  |
| Phase composition |  | 1193.15 | Matrix + Second phase + Eutectic: inhomog. + overall (EDX); _overall (EDX): Mn 0.531, Nb 0.469; Matrix: Mn 0.622, Nb 0.378; Second phase: Mn 0.159, Nb 0.841_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 17; `ORC-662WDQ3BFQ` |  |
| Phase composition |  | 1223.15 | Matrix + Second phase + Eutectic: Eutectic; _Matrix: Mn 0.995, Nb 0.005; Second phase: Mn 0.727, Nb 0.273_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 12; `ORC-VPMY7VNBBZ` |  |
| Phase composition |  | 1223.15 | Matrix + Second phase + Eutectic: inhomog. + overall (EDX); _overall (EDX): Mn 0.417, Nb 0.583; Matrix: Mn 0.633, Nb 0.367; Second phase: Mn 0.167, Nb 0.833_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 19; `ORC-LGIWTNAFSM` |  |
| Phase composition |  | 1223.15 | Matrix + Second phase + η-Nb-Mn + overall (EDX); _overall (EDX): Mn 0.897, Nb 0.103; Matrix: Mn 0.994, Nb 0.006; Second phase: Mn 0.726, Nb 0.274; η-Nb-Mn: Mn 0.545, Nb 0.455_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 14; `ORC-65SJA7LCK2` |  |
| Phase composition |  | 1223.15 | Matrix + Second phase + η-Nb-Mn + overall (EDX); _overall (EDX): Mn 0.96, Nb 0.04; Matrix: Mn 0.994, Nb 0.006; Second phase: Mn 0.725, Nb 0.275; η-Nb-Mn: Mn 0.554, Nb 0.446_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 7; `ORC-YV4V3ZSFNT` |  |
| Phase composition |  | 1223.15 | Matrix + Second phase: Small + η-Nb-Mn-O; _Matrix: Mn 0.994, Nb 0.006; η-Nb-Mn-O: Mn 0.486, Nb 0.47_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 5; `ORC-5CNNQNPMLA` |  |
| Phase composition |  | 1223.15 | Matrix + η-Nb-Mn-O + overall (EDX); _overall (EDX): Mn 0.98, Nb 0.02; Matrix: Mn 0.994, Nb 0.006; η-Nb-Mn-O: Mn 0.543, Nb 0.449_ | experimental | [2] Yan 2021 | Table 4, p. 10, row 3; `ORC-WNZAAB3IGW` |  |

### Crystal structure (64)

Table: Crystal structure, Mn–Nb system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 5.438 Å | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 4; `ORC-BL3Y3HCOKR.2afc35` |  |
| Lattice a | 4.806 Å | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 3; `ORC-QNJ642YGIH.12cc6d` |  |
| Lattice a | 5.471 Å | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 5; `ORC-SU3FV7FTKL.9b6844` |  |
| Lattice a | 4.802 Å | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 2; `ORC-VLZY6L3JDG.f152f6` |  |
| Lattice a | 5.432 Å | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 6; `ORC-XWW3CWK4SS.32d3e7` |  |
| Lattice a | 4.854 Å | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 36; `ORC-2BKABFCSCN.0f440f` |  |
| Lattice a | 4.826 Å | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 35; `ORC-EYDNY3TQDW.659a97` |  |
| Lattice a | 4.974 Å | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 38; `ORC-HHSDGCIX4R.d088ea` |  |
| Lattice a | 5.465 Å | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 40; `ORC-MDMIAAJB2I.7c138b` |  |
| Lattice a | 4.971 Å | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 37; `ORC-OO2KGJILYV.4f671b` |  |
| Lattice a | 5.456 Å | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 39; `ORC-OTBUBFBO2H.2030d7` |  |
| Lattice a | 4.8801 Å ± 1.000e-4 | 100 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 4; `ORC-ZLYJ2TYSIO.6c591c` |  |
| Lattice a | 4.8824 Å ± 1.000e-4 | 150 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 3; `ORC-IMUETBYVN6.fb9b3e` |  |
| Lattice a | 4.8834 Å ± 1.000e-4 | 200 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 2; `ORC-XT5HMRSZ6D.3f86ff` |  |
| Lattice a | 4.89376 Å ± 4.000e-5 | 298.15 | Nb1.08Mn1.92; _alloy: Mn 0.6, Nb 0.4_ | experimental | [2] Yan 2021 | Table 3, p. 9, row 1; `ORC-TLDC4BHCAX.b94780` |  |
| Lattice a | 0.48898 not_printed ± 1.000e-5 | 298.15 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 1; `ORC-KGVQ2GBBWR.e78d59` |  |
| Lattice a | 4.8898 Å ± 1.000e-4 | 298.15 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 5; `ORC-XMVXEW2F2E.bee461` |  |
| Lattice b | 4.8801 Å ± 1.000e-4 | 100 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 4; `ORC-ZLYJ2TYSIO.a11da6` |  |
| Lattice b | 4.8824 Å ± 1.000e-4 | 150 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 3; `ORC-IMUETBYVN6.03b23d` |  |
| Lattice b | 4.8834 Å ± 1.000e-4 | 200 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 2; `ORC-XT5HMRSZ6D.5d282d` |  |
| Lattice b | 0.48898 not_printed ± 1.000e-5 | 298.15 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 1; `ORC-KGVQ2GBBWR.d95924` |  |
| Lattice b | 4.8898 Å ± 1.000e-4 | 298.15 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 5; `ORC-XMVXEW2F2E.f2efbe` |  |
| Lattice c | 8.428 Å | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 4; `ORC-BL3Y3HCOKR.225d04` |  |
| Lattice c | 7.937 Å | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 3; `ORC-QNJ642YGIH.c8e1c0` |  |
| Lattice c | 8.524 Å | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 5; `ORC-SU3FV7FTKL.ce1fb6` |  |
| Lattice c | 7.942 Å | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 2; `ORC-VLZY6L3JDG.840449` |  |
| Lattice c | 9.135 Å | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 6; `ORC-XWW3CWK4SS.f0fa15` |  |
| Lattice c | 7.93 Å | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 1; `ORC-ZGR3HEHOSE.9d326d` |  |
| Lattice c | 27.056 Å | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 36; `ORC-2BKABFCSCN.27c82e` |  |
| Lattice c | 27.349 Å | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 35; `ORC-EYDNY3TQDW.b9ae65` |  |
| Lattice c | 27.169 Å | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 38; `ORC-HHSDGCIX4R.47900e` |  |
| Lattice c | 27.784 Å | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 40; `ORC-MDMIAAJB2I.d16e89` |  |
| Lattice c | 27.167 Å | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 37; `ORC-OO2KGJILYV.467f0a` |  |
| Lattice c | 27.855 Å | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 39; `ORC-OTBUBFBO2H.49cbf6` |  |
| Lattice c | 7.9798 Å ± 1.000e-4 | 100 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 4; `ORC-ZLYJ2TYSIO.f3eb48` |  |
| Lattice c | 7.9823 Å ± 1.000e-4 | 150 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 3; `ORC-IMUETBYVN6.07048e` |  |
| Lattice c | 7.9853 Å ± 2.000e-4 | 200 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 2; `ORC-XT5HMRSZ6D.7707c2` |  |
| Lattice c | 8.00616 Å ± 9.000e-5 | 298.15 | Nb1.08Mn1.92; _alloy: Mn 0.6, Nb 0.4_ | experimental | [2] Yan 2021 | Table 3, p. 9, row 1; `ORC-TLDC4BHCAX.5a1e09` |  |
| Lattice c | 0.7997 not_printed ± 1.000e-5 | 298.15 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 1; `ORC-KGVQ2GBBWR.f7d3d7` |  |
| Lattice c | 7.997 Å ± 1.000e-4 | 298.15 | NbMn2; _alloy: Nb 0.333333_ | experimental | [2] Yan 2021 | Table 2, p. 6, row 5; `ORC-XMVXEW2F2E.c1a41e` |  |
| lattice v0 | 215.8 Å3 | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 4; `ORC-BL3Y3HCOKR.1691a6` |  |
| lattice v0 | 215.8 Å3 per formula unit | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 4; `ORC-BL3Y3HCOKR.879877` |  |
| lattice v0 | 158.7 Å3 per formula unit | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 3; `ORC-QNJ642YGIH.96d590` |  |
| lattice v0 | 158.7 Å3 | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 3; `ORC-QNJ642YGIH.f4805f` |  |
| lattice v0 | 221 Å3 per formula unit | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 5; `ORC-SU3FV7FTKL.09f642` |  |
| lattice v0 | 221 Å3 | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 5; `ORC-SU3FV7FTKL.1ac39a` |  |
| lattice v0 | 158.6 Å3 per formula unit | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 2; `ORC-VLZY6L3JDG.2eac9f` |  |
| lattice v0 | 158.6 Å3 | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 2; `ORC-VLZY6L3JDG.f2efca` |  |
| lattice v0 | 233.45 Å3 per formula unit | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 6; `ORC-XWW3CWK4SS.54b0a6` |  |
| lattice v0 | 233.45 Å3 | 0 | C14; _alloy: Mn 0.333333, Nb 0.666667_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 6; `ORC-XWW3CWK4SS.b70fe0` |  |
| lattice v0 | 158.4 Å3 per formula unit | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 1; `ORC-ZGR3HEHOSE.3870d4` |  |
| lattice v0 | 158.4 Å3 | 0 | C14; _alloy: Mn 0.666667, Nb 0.333333_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 1; `ORC-ZGR3HEHOSE.6ccb66` |  |
| lattice v0 | 552.2 Å3 | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 36; `ORC-2BKABFCSCN.ccf99d` |  |
| lattice v0 | 552.2 Å3 per formula unit | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 36; `ORC-2BKABFCSCN.f88afb` |  |
| lattice v0 | 551.7 Å3 | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 35; `ORC-EYDNY3TQDW.a75ca7` |  |
| lattice v0 | 551.7 Å3 per formula unit | 0 | μ; _alloy: Mn 0.538462, Nb 0.461538_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 35; `ORC-EYDNY3TQDW.c22372` |  |
| lattice v0 | 582.1 Å3 per formula unit | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 38; `ORC-HHSDGCIX4R.7de22f` |  |
| lattice v0 | 582.1 Å3 | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 38; `ORC-HHSDGCIX4R.93a17f` |  |
| lattice v0 | 718.7 Å3 per formula unit | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 40; `ORC-MDMIAAJB2I.8e39f8` |  |
| lattice v0 | 718.7 Å3 | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 40; `ORC-MDMIAAJB2I.d38b5b` |  |
| lattice v0 | 581.4 Å3 | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 37; `ORC-OO2KGJILYV.a5c32c` |  |
| lattice v0 | 581.4 Å3 per formula unit | 0 | μ; _alloy: Mn 0.461538, Nb 0.538462_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 37; `ORC-OO2KGJILYV.da61a1` |  |
| lattice v0 | 718.1 Å3 per formula unit | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 39; `ORC-OTBUBFBO2H.6e4df6` |  |
| lattice v0 | 718.1 Å3 | 0 | μ; _alloy: Mn 0.076923, Nb 0.923077_ | DFT | [1] Liu 2012 | Table 4, p. 8, row 39; `ORC-OTBUBFBO2H.f9dd8e` |  |

## Sources

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

1. Shuhong Liu, Bengt Hallstedt, Denis Music, Yong Du, Ab initio calculations and thermodynamic modeling for the Fe–Mn–Nb system, Calphad 38, 43-58 (2012). [doi:10.1016/j.calphad.2012.03.004](https://doi.org/10.1016/j.calphad.2012.03.004)
2. Xinlin Yan, Pavel Brož, Jan Vřešťál, Jiří Vlach, Jiří Buršík, Martina Mazalová et al., On the constitution and thermodynamic modeling of the phase diagrams Nb-Mn and Ta-Mn, Journal of Alloys and Compounds 865, 158715 (2021). [doi:10.1016/j.jallcom.2021.158715](https://doi.org/10.1016/j.jallcom.2021.158715)

## 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/).