# Si–Ta system

> Si–Ta system: 154 accepted literature values (formation 71, invariant reaction 40, phase transition 21, crystal structure 20) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/SI-TA.html · Markdown: https://data.orchid-project.org/systems/SI-TA.md

154 accepted literature values from 4 paper(s) (experimental 56, model 66, DFT 11, unspecified 21); 4 calculated phase diagram(s). 7 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/SI-TA.json) · [CSV](https://data.orchid-project.org/systems/SI-TA.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#SI-TA) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#SI-TA/SiTa-03Che-LB.json) · [phases (11)](https://data.orchid-project.org/phases/pages/SI-TA.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/SI-TA.html) · [Markdown](https://data.orchid-project.org/systems/SI-TA.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 56 |
| model | 66 |
| DFT | 11 |
| unspecified | 21 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 40 |
| phase transition | 21 |
| formation | 71 |
| heat capacity / entropy / enthalpy | 2 |
| crystal structure | 20 |

## 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 |
|---|---|---|---|
| SiTa-03Che-LB.tdb | P.Y. Chevalier, E. Fischer, unpublished, 2003. | `9af74fc82b4f21c6b5bc90a54c50409c242a4bef5217c5d263d86f2e4f061d13` | [viewer](https://orchid-project.org/phase-diagrams/#SI-TA/SiTa-03Che-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiTa-03Che-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiTa-03Che-LB.json) |
| SiTa-09Guo.tdb | Z. Guo, W. Yuan, Y. Sun, Z. Cai, Z. Qiao, J. Phase Equilib. Diffus., 30, 564-70(2009). [doi:10.1007/s11669-009-9579-x](https://doi.org/10.1007/s11669-009-9579-x) | `c62d1268ef5826629aabbad7e3d3028fd5cd468402d4af38b0280b52d1c2d65b` | [viewer](https://orchid-project.org/phase-diagrams/#SI-TA/SiTa-09Guo.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiTa-09Guo.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiTa-09Guo.json) |
| SiTa-13Dro.tdb | I. Drouelle, C. Servant, J. Alloys Compd., 551, 293-99(2013). [doi:10.1016/j.jallcom.2012.09.148](https://doi.org/10.1016/j.jallcom.2012.09.148) | `ea6e244374f268486ec65b7f6a1b361aef95c6103411f4e1b36fd21d4b1fb338` | [viewer](https://orchid-project.org/phase-diagrams/#SI-TA/SiTa-13Dro.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiTa-13Dro.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiTa-13Dro.json) |
| SiTa-89Vah.tdb | C. Vahlas, P.Y. Chevalier, E. Blanquet, Calphad, 13, 273-92(1989). [doi:10.1016/0364-5916(89)90007-2](https://doi.org/10.1016/0364-5916%2889%2990007-2) | `e0c04ce292c0b0672c987526b60a481541adc2c4fb4c05360ac3cf941d12a355` | [viewer](https://orchid-project.org/phase-diagrams/#SI-TA/SiTa-89Vah.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/SiTa-89Vah.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/SiTa-89Vah.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| SiTa-03Che-LB.tdb | 2717.73 | SI3TA5 (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.70429) |
| SiTa-03Che-LB.tdb | 2717.73 | SI3TA5 (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.70438) |
| SiTa-03Che-LB.tdb | 2717.73 | SI3TA5 (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.70412) |
| SiTa-03Che-LB.tdb | 2608.6 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.75509) |
| SiTa-03Che-LB.tdb | 2608.59 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.75529) |
| SiTa-03Che-LB.tdb | 2608.59 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.75535) |
| SiTa-03Che-LB.tdb | 2547.29 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.81122) + BCC_A2 (x(Ta) 0.93731) |
| SiTa-03Che-LB.tdb | 2547.29 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.81123) + BCC_A2 (x(Ta) 0.93731) |
| SiTa-03Che-LB.tdb | 2228.35 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.42157) + SI3TA5 (x(Ta) 0.625) |
| SiTa-03Che-LB.tdb | 2228.35 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.4217) + SI3TA5 (x(Ta) 0.625) |
| SiTa-03Che-LB.tdb | 1652.08 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.06028) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-03Che-LB.tdb | 1652.07 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.05988) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-09Guo.tdb | 2709.53 | SI3TA5_D8M (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.7149) |
| SiTa-09Guo.tdb | 2709.53 | SI3TA5_D8M (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.71464) |
| SiTa-09Guo.tdb | 2709.53 | SI3TA5_D8M (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.71495) |
| SiTa-09Guo.tdb | 2613.89 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.76405) |
| SiTa-09Guo.tdb | 2613.89 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.764) |
| SiTa-09Guo.tdb | 2613.89 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.76416) |
| SiTa-09Guo.tdb | 2531.98 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.82332) + BCC_A2 (x(Ta) 0.92752) |
| SiTa-09Guo.tdb | 2531.98 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.82335) + BCC_A2 (x(Ta) 0.92754) |
| SiTa-09Guo.tdb | 2432.86 | SI3TA5_D8M (x(Ta) 0.625) + SI3TA5_D8L (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) |
| SiTa-09Guo.tdb | 2432.86 | LIQUID (x(Ta) 0.43622) + SI3TA5_D8L (x(Ta) 0.625) + SI3TA5_D8M (x(Ta) 0.625) |
| SiTa-09Guo.tdb | 2273.7 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.3987) + SI3TA5_D8L (x(Ta) 0.625) |
| SiTa-09Guo.tdb | 2273.69 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.39845) + SI3TA5_D8L (x(Ta) 0.625) |
| SiTa-09Guo.tdb | 1661.12 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.0464) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-09Guo.tdb | 1661.11 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.04602) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-13Dro.tdb | 2729.12 | SI3TA5_D8M (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.70336) |
| SiTa-13Dro.tdb | 2729.12 | SI3TA5_D8M (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.70335) |
| SiTa-13Dro.tdb | 2729.12 | SI3TA5_D8M (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.70345) |
| SiTa-13Dro.tdb | 2634.49 | SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.74625) + SITA3 (x(Ta) 0.75) |
| SiTa-13Dro.tdb | 2634.48 | SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.74643) + SITA3 (x(Ta) 0.75) |
| SiTa-13Dro.tdb | 2634.48 | SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.74644) + SITA3 (x(Ta) 0.75) |
| SiTa-13Dro.tdb | 2560.21 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.80409) + BCC_A2 (x(Ta) 0.86547) |
| SiTa-13Dro.tdb | 2560.21 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.80413) + BCC_A2 (x(Ta) 0.86552) |
| SiTa-13Dro.tdb | 2433.02 | SI3TA5_D8M (x(Ta) 0.625) + SI3TA5_D8L (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) |
| SiTa-13Dro.tdb | 2433.02 | LIQUID (x(Ta) 0.45901) + SI3TA5_D8L (x(Ta) 0.625) + SI3TA5_D8M (x(Ta) 0.625) |
| SiTa-13Dro.tdb | 2240.2 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.42287) + SI3TA5_D8L (x(Ta) 0.625) |
| SiTa-13Dro.tdb | 2240.2 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.42299) + SI3TA5_D8L (x(Ta) 0.625) |
| SiTa-13Dro.tdb | 1670 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.03669) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-13Dro.tdb | 1670 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.03632) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-89Vah.tdb | 2751.8 | SI3TA5 (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.71257) |
| SiTa-89Vah.tdb | 2751.8 | SI3TA5 (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.71268) |
| SiTa-89Vah.tdb | 2751.8 | SI3TA5 (x(Ta) 0.625) + SITA2_C16 (x(Ta) 0.66667) + LIQUID (x(Ta) 0.71244) |
| SiTa-89Vah.tdb | 2631.18 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.76865) |
| SiTa-89Vah.tdb | 2631.18 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.76856) |
| SiTa-89Vah.tdb | 2631.18 | SITA2_C16 (x(Ta) 0.66667) + SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.76869) |
| SiTa-89Vah.tdb | 2587.38 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.80938) + BCC_A2 (x(Ta) 1) |
| SiTa-89Vah.tdb | 2587.38 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.80937) + BCC_A2 (x(Ta) 1) |
| SiTa-89Vah.tdb | 2587.38 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.80937) + BCC_A2 (x(Ta) 1) |
| SiTa-89Vah.tdb | 2587.38 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.80941) + BCC_A2 (x(Ta) 1) |
| SiTa-89Vah.tdb | 2587.38 | SITA3 (x(Ta) 0.75) + LIQUID (x(Ta) 0.8094) + BCC_A2 (x(Ta) 1) |
| SiTa-89Vah.tdb | 2254.98 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.39893) + SI3TA5 (x(Ta) 0.625) |
| SiTa-89Vah.tdb | 2254.98 | SI2TA_C40 (x(Ta) 0.33333) + LIQUID (x(Ta) 0.39904) + SI3TA5 (x(Ta) 0.625) |
| SiTa-89Vah.tdb | 1657.73 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.05764) + SI2TA_C40 (x(Ta) 0.33333) |
| SiTa-89Vah.tdb | 1657.73 | DIAMOND_A4 (x(Ta) 0) + LIQUID (x(Ta) 0.05734) + SI2TA_C40 (x(Ta) 0.33333) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/SI/SI-TA.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/SI/SI-TA.json) · [CALPHAD hull SiTa-03Che-LB](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-TA--SiTa-03Che-LB.json) · [CALPHAD hull SiTa-09Guo](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-TA--SiTa-09Guo.json) · [CALPHAD hull SiTa-89Vah](https://data.orchid-project.org/hulls/calphad-sgte/SI/SI-TA--SiTa-89Vah.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Si–Ta system (40)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2823 | congruent melting: L -> βTa5Si3 | βTa5Si3: Si 0.375 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 10; `ORC-RFMZFAUD4S` |  |
| 2816 | congruent melting: L -> βTa5Si3 | βTa5Si3: Si 0.375 | model | [1] Guo 2009 | Table 4, p. 4, row 9; `ORC-VYVHETVM65` |  |
| 2786 | (L) + Si5Ta3 -> SiTa2 | L: Ta 0.711; SiTa2: Ta 0.666667 | model | [2] Vahlas 1989 | Table 4, p. 9, row 12; `ORC-EW22MLRCSB` |  |
| 2714 | Si3Ta5_HT + Liq \<-> SiTa2 | Si3Ta5_HT: Ta 0.625; L: Ta 0.711; SiTa2: Ta 0.666667 | model | [3] Drouelle 2013 | Table 5, p. 4, row 11; `ORC-OMOS7YEWXM` |  |
| 2713 | L + βTa5Si3 -> Ta2Si | L: Si 0.286; βTa5Si3: Si 0.375; Ta2Si: Si 0.333 | model | [1] Guo 2009 | Table 4, p. 4, row 5; `ORC-44QITCCI6S` |  |
| 2713 | (L) + Si5Ta3 -> SiTa2 | L: Ta 0.72; SiTa2: Ta 0.666667 | experimental | [2] Vahlas 1989; _cites ref. 30_ | Table 4, p. 9, row 13; `ORC-ASHFKZLBSR` |  |
| 2713 | Si3Ta5_HT + Liq \<-> SiTa2 | Si3Ta5_HT: Ta 0.625; L: Ta 0.72; SiTa2: Ta 0.666667 | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 10; `ORC-RCUXKKXDLQ` |  |
| 2713 | L + βTa5Si3 -> Ta2Si | L: Si 0.28; βTa5Si3: Si 0.375; Ta2Si: Si 0.333 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 6; `ORC-XCDYRU2GSZ` |  |
| 2706 | Si3Ta5_HT + Liq \<-> SiTa2 | Si3Ta5_HT: Ta 0.625; L: Ta 0.7534; SiTa2: Ta 0.666667 | model | [3] Drouelle 2013 | Table 5, p. 4, row 12; `ORC-CMLWNR3JGU` |  |
| 2643 | SiTa2 + Liq \<-> SiTa3 | SiTa2: Ta 0.666667; L: Ta 0.7726; SiTa3: Ta 0.75 | model | [3] Drouelle 2013 | Table 5, p. 4, row 15; `ORC-NP4RHSD6TH` |  |
| 2622 | (L) + SiTa2 -> SiTa3 | L: Ta 0.768; SiTa2: Ta 0.666667; SiTa3: Ta 0.75 | model | [2] Vahlas 1989 | Table 4, p. 9, row 14; `ORC-N6R3CNONWN` |  |
| 2619 | SiTa2 + Liq \<-> SiTa3 | SiTa2: Ta 0.666667; L: Ta 0.7576; SiTa3: Ta 0.75 | model | [3] Drouelle 2013 | Table 5, p. 4, row 14; `ORC-VLNVHIXJXX` |  |
| 2613 | L + Ta2Si -> Ta3Si | L: Si 0.234; Ta2Si: Si 0.333; Ta3Si: Si 0.25 | model | [1] Guo 2009 | Table 4, p. 4, row 3; `ORC-53CTZJIE2A` |  |
| 2613 | SiTa2 + Liq \<-> SiTa3 | SiTa2: Ta 0.666667; L: Ta 0.78; SiTa3: Ta 0.75 | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 13; `ORC-AY5R7HRCFV` |  |
| 2613 | L + Ta2Si -> Ta3Si | L: Si 0.22; Ta2Si: Si 0.333; Ta3Si: Si 0.25 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 4; `ORC-KPXEXFUTDH` |  |
| 2579 | eutectic: (L) -> bcc+SiTa3 | L: Ta 0.31; SiTa3: Ta 0.75 | model | [2] Vahlas 1989 | Table 4, p. 9, row 16; `ORC-DP7YEM6JXM` |  |
| 2533 | Liq \<-> SiTa3 + (Ta) | L: Ta 0.83; SiTa3: Ta 0.75 | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 7; `ORC-2AX7Z2U6G7` |  |
| 2533 | eutectic: L -> (Ta) + Ta3Si | L: Si 0.17; (Ta): Si 0.07; Ta3Si: Si 0.25 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 2; `ORC-2VFATOWBCK` |  |
| 2533 | eutectic: (L) -> bcc+SiTa3 | L: Ta 0.83; SiTa3: Ta 0.75 | experimental | [2] Vahlas 1989; _cites ref. 30_ | Table 4, p. 9, row 17; `ORC-AFDOJYZLWH` |  |
| 2533 | eutectic: L -> (Ta) + Ta3Si | L: Si 0.177; (Ta): Si 0.07; Ta3Si: Si 0.25 | model | [1] Guo 2009 | Table 4, p. 4, row 1; `ORC-VU3LMII25W` |  |
| 2526 | Liq \<-> SiTa3 + (Ta) | L: Ta 0.8181; SiTa3: Ta 0.75 | model | [3] Drouelle 2013 | Table 5, p. 4, row 8; `ORC-L2XCHLU5RO` |  |
| 2508 | Liq \<-> SiTa3 + (Ta) | L: Ta 0.8364; SiTa3: Ta 0.75 | model | [3] Drouelle 2013 | Table 5, p. 4, row 9; `ORC-SXD33CJN5G` |  |
| 2433 | polymorphic: βTa5Si3 -> αTa5Si3 | βTa5Si3: Si 0.375; αTa5Si3: Si 0.375, Ta 0.625 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 8; `ORC-E4Z3YBP56R` |  |
| 2433 | polymorphic: βTa5Si3 -> αTa5Si3 | βTa5Si3: Si 0.375; αTa5Si3: Si 0.375, Ta 0.625 | model | [1] Guo 2009 | Table 4, p. 4, row 7; `ORC-SMTQJWJKUK` |  |
| 2313 | congruent melting: L -> TaSi2 | TaSi2: Si 0.667 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 14; `ORC-PEQOBHO2BM` |  |
| 2307 | congruent melting: L -> TaSi2 | TaSi2: Si 0.667 | model | [1] Guo 2009 | Table 4, p. 4, row 13; `ORC-F5YM2OZPUO` |  |
| 2274 | eutectic: L -> TaSi2 + αTa5Si3 | L: Si 0.602; TaSi2: Si 0.667; αTa5Si3: Si 0.375 | model | [1] Guo 2009 | Table 4, p. 4, row 11; `ORC-NJYIYA7364` |  |
| 2267 | eutectic: (L) -> Si2Ta+Si3Ta5 | L: Ta 0.393; Si2Ta: Ta 0.333333; Si3Ta5: Ta 0.625 | model | [2] Vahlas 1989 | Table 4, p. 9, row 8; `ORC-A23N75LGAP` |  |
| 2253 | Liq \<->Si2Ta + Si3Ta5_LT | L: Ta 0.3963; Si2Ta: Ta 0.333333; Si3Ta5_LT: Ta 0.625 | model | [3] Drouelle 2013 | Table 5, p. 4, row 5; `ORC-5JIW7SDKLF` |  |
| 2238 | Liq \<->Si2Ta + Si3Ta5_LT | L: Ta 0.4153; Si2Ta: Ta 0.333333; Si3Ta5_LT: Ta 0.625 | model | [3] Drouelle 2013 | Table 5, p. 4, row 6; `ORC-UDVW7HMLJN` |  |
| 2233 | eutectic: (L) -> Si2Ta+Si3Ta5 | L: Ta 0.38; Si2Ta: Ta 0.333333; Si3Ta5: Ta 0.625 | experimental | [2] Vahlas 1989; _cites ref. 30_ | Table 4, p. 9, row 9; `ORC-B6QHB4MD4W` |  |
| 2233 | Liq \<->Si2Ta + Si3Ta5_LT | L: Ta 0.38; Si2Ta: Ta 0.333333; Si3Ta5_LT: Ta 0.625 | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 4; `ORC-GTHAIGCD5K` |  |
| 2233 | eutectic: L -> TaSi2 + αTa5Si3 | L: Si 0.62; TaSi2: Si 0.667; αTa5Si3: Si 0.375 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 12; `ORC-WHTIZ2G2HN` |  |
| 1679 | Liq \<-> Si + Si2Ta | L: Ta 0.0168; Si: Ta 0; Si2Ta: Ta 0.333333 | model | [3] Drouelle 2013 | Table 5, p. 4, row 2; `ORC-645RVZY5JE` |  |
| 1673 | eutectic: L -> (Si) + TaSi2 | L: Si 0.99; (Si): Si 1; TaSi2: Si 0.667 | experimental | [1] Guo 2009; _cites Yu 1981_ | Table 4, p. 4, row 16; `ORC-AJYS6NTAOD` |  |
| 1673 | Liq \<-> Si + Si2Ta | L: Ta 0.01; Si: Ta 0; Si2Ta: Ta 0.333333 | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 1; `ORC-JLZ2YTIJ37` |  |
| 1673 | eutectic: (L) -> Si(dia) + Si2Ta | L: Ta 0.02; Si(dia): Ta 0; Si2Ta: Ta 0.333333 | experimental | [2] Vahlas 1989; _cites ref. 30_ | Table 4, p. 9, row 5; `ORC-QTEWYEHAWJ` |  |
| 1666 | eutectic: L -> (Si) + TaSi2 | L: Si 0.954; (Si): Si 1; TaSi2: Si 0.667 | model | [1] Guo 2009 | Table 4, p. 4, row 15; `ORC-ACSA7I4EB7` |  |
| 1662 | eutectic: (L) -> Si(dia) + Si2Ta | L: Ta 0.052; Si(dia): Ta 0; Si2Ta: Ta 0.333333 | model | [2] Vahlas 1989 | Table 4, p. 9, row 4; `ORC-CP2SC6OEOM` |  |
| 1624 | Liq \<-> Si + Si2Ta | L: Ta 0.0818; Si: Ta 0; Si2Ta: Ta 0.333333 | model | [3] Drouelle 2013 | Table 5, p. 4, row 3; `ORC-K7OGOFCU7W` |  |

## 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, Si–Ta system (52)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Si0.25Ta0.75 | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -43.332 kJ/mol-atom | 2087.5 | experimental | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 26; `ORC-K6GMSBONRZ.72bc9b` |  |
| Si0.25Ta0.75 | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -42.2237 kJ/mol-atom | 298.15 | model | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [3] Drouelle 2013 | Table 2, p. 2, row 25; `ORC-GDYQLC5AAG.09c37e` |  |
| Si0.25Ta0.75 | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -39 kJ/mol-atom | 298.15 | model | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [3] Drouelle 2013; _cites F 1988_ | Table 2, p. 2, row 24; `ORC-LQUEJVU6EZ.09a473` |  |
| Si0.3333Ta0.6667 | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -55.969 kJ/mol-atom | 1027 | experimental | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [3] Drouelle 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 2, row 23; `ORC-GIH62I4VZW.4af807` |  |
| Si0.3333Ta0.6667 | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -52.117 kJ/mol-atom | 2045 | experimental | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 21; `ORC-345NTR6DDL.069d3c` |  |
| Si0.3333Ta0.6667 | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -52.0086 kJ/mol-atom | 298.15 | model | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [3] Drouelle 2013 | Table 2, p. 2, row 22; `ORC-RHDBHMGIWB.818d06` |  |
| Si0.3333Ta0.6667 | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -51 kJ/mol-atom | 298.15 | model | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [3] Drouelle 2013; _cites F 1988_ | Table 2, p. 2, row 20; `ORC-N2WMARA5B6.1878a5` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -54.937 kJ/mol-atom | 1027 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 2, row 19; `ORC-OVSTHRO2TO.ad70dc` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -52.423 kJ/mol-atom | 1900 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 17; `ORC-WLRX6KX33K.5fec23` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -52.42 kJ/mol-atom | 298.15 | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Tao 2009_ [doi](https://doi.org/10.1103/physrevb.80.104103) | Table 2, p. 2, row 18; `ORC-3ANFKCW2B4.2bb240` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -52.3815 kJ/mol-atom | 298.15 | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013 | Table 2, p. 2, row 16; `ORC-WJ5E2FLXGU.099d9d` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -41.9 kJ/mol-atom | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 15; `ORC-GCYCOHJVMK.b0dbf6` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -39.7 kJ/mol-atom | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Robins 1955_ [doi](https://doi.org/10.1016/0001-6160%2855%2990120-6) | Table 2, p. 2, row 14; `ORC-OEWHAHTIO4.06dce4` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -38.1 kJ/mol-atom ± 1.7 | 1473 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Meschel 1998_ [doi](https://doi.org/10.1016/s0925-8388%2898%2900747-6) | Table 2, p. 2, row 12; `ORC-5O7BBL2ZS5.6cd718` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -38.1 kJ/mol-atom | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Nowotny 1956_ [doi](https://doi.org/10.1007/bf00902640) | Table 2, p. 2, row 13; `ORC-HO7JT6JFYO.6095fb` |  |
| Si0.375Ta0.625_HT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -37.7 kJ/mol-atom | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 2, row 11; `ORC-RBNDQYDXRA.5f2d77` |  |
| Si0.375Ta0.625_LT |  | -56.15 kJ/mol-atom | 298.15 | DFT |  |  | [3] Drouelle 2013; _cites Tao 2009_ [doi](https://doi.org/10.1103/physrevb.80.104103) | Table 2, p. 2, row 10; `ORC-QE5SERQE3W.95bb29` |  |
| Si0.375Ta0.625_LT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -55 kJ/mol-atom | 298.15 | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013; _cites F 1988_ | Table 2, p. 2, row 9; `ORC-U5TSDHNECV.80bc75` |  |
| Si0.375Ta0.625_LT | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -52.3807 kJ/mol-atom | 298.15 | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [3] Drouelle 2013 | Table 2, p. 2, row 8; `ORC-25XRJVWZGZ.60d870` |  |
| Si0.6667Ta0.3333 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -46.0991 kJ/mol-atom | 298.15 | model | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [3] Drouelle 2013 | Table 2, p. 2, row 6; `ORC-52ICL23NCF.c154c6` |  |
| Si0.6667Ta0.3333 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -46 kJ/mol-atom ± 2.5 | 1473 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [3] Drouelle 2013; _cites Meschel 1998_ [doi](https://doi.org/10.1016/s0925-8388%2898%2900747-6) | Table 2, p. 2, row 7; `ORC-M3FHPP37LD.5251f4` |  |
| Si0.6667Ta0.3333 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -44 kJ/mol-atom | 298.15 | model | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [3] Drouelle 2013; _cites F 1988_ | Table 2, p. 2, row 5; `ORC-KHEAR6YM4N.2832a2` |  |
| Si0.6667Ta0.3333 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -43.332 kJ/mol-atom | 1760.5 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 4; `ORC-OLNLWPIRLP.a9a6fd` |  |
| Si0.6667Ta0.3333 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -39.7 kJ/mol-atom | 298.15 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [3] Drouelle 2013; _cites Kubaschewski 1968_ | Table 2, p. 2, row 3; `ORC-GBN3NM56LI.8ae575` |  |
| Si0.6667Ta0.3333 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -38.8 kJ/mol-atom | 298.15 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [3] Drouelle 2013; _cites Robins 1955_ [doi](https://doi.org/10.1016/0001-6160%2855%2990120-6) | Table 2, p. 2, row 2; `ORC-IT2F53DXDU.3e331b` |  |
| Si0.75Ta0.25 | [Si3Ta](https://data.orchid-project.org/compounds/Si3Ta.html) | -39 kJ/mol-atom | 298.15 | model |  | 4.527 (oqmd-2031407) | [3] Drouelle 2013; _cites F 1988_ | Table 2, p. 2, row 1; `ORC-2KKFN2CQ4A.44744c` |  |
| Ta2Si | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -56 kJ/mol-atom |  | model | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [4] Broz 2013; _cites Storms 1985_ | Table 2, p. 6, row 67; `ORC-NKFHDZU4WA.bf548e` |  |
| Ta2Si | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -54.3 kJ/mol-atom | 0 | unspecified | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [4] Broz 2013 | Table 2, p. 6, row 64; `ORC-FBLO4KTD2S.899757` |  |
| Ta2Si | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -52.8 kJ/mol-atom | 0 | model | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 2, p. 6, row 68; `ORC-BDQ65JI24R.883df6` |  |
| Ta2Si | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -52.1 kJ/mol-atom |  | model | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [4] Broz 2013; _cites Gorelkin 1971_ | Table 2, p. 6, row 65; `ORC-VW4YXFKTFU.2997f1` |  |
| Ta2Si | [SiTa2](https://data.orchid-project.org/compounds/SiTa2.html) | -51 kJ/mol-atom |  | model | -51.407 (mp-aaaaaedb) | -53.99 (oqmd-7796) | [4] Broz 2013; _cites Eremenko 1975_ | Table 2, p. 6, row 66; `ORC-Z6JDBW2ROQ.ccd689` |  |
| Ta3Si | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -43.3 kJ/mol-atom |  | model | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [4] Broz 2013; _cites Gorelkin 1971_ | Table 2, p. 6, row 61; `ORC-PP5SXB5CBX.b2c03b` |  |
| Ta3Si | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -43 kJ/mol-atom | 0 | model | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 2, p. 6, row 63; `ORC-AHNZHZ5XAC.fed5e5` |  |
| Ta3Si | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -43 kJ/mol-atom | 0 | unspecified | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [4] Broz 2013 | Table 2, p. 6, row 60; `ORC-E5WTKSCT4X.d92315` |  |
| Ta3Si | [SiTa3](https://data.orchid-project.org/compounds/SiTa3.html) | -39 kJ/mol-atom |  | model | -40.609 (mp-aaabgjfa) | -42.591 (oqmd-18906) | [4] Broz 2013; _cites Eremenko 1975_ | Table 2, p. 6, row 62; `ORC-7ELL3ZKUDM.ed0e6a` |  |
| Ta5Si3 | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -48.1 kJ/mol-atom | 0 | unspecified | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013 | Table 2, p. 6, row 59; `ORC-MDKPE47QNG.e6c13e` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -59.8 kJ/mol-atom | 0 | unspecified | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013 | Table 2, p. 6, row 49; `ORC-DMFUOBURV7.4359f0` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -56.2 kJ/mol-atom |  | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Tao 2011_ | Table 2, p. 6, row 54; `ORC-OI7T2D7Y7O.2deb22` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -52.3 kJ/mol-atom | 0 | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 2, p. 6, row 55; `ORC-RN4HQWB5IY.49c929` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -41.8 kJ/mol-atom ± 7.8 | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Myers 1957_ | Table 2, p. 6, row 50; `ORC-4J2HNEG4DB.1a0a5b` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -39.7 kJ/mol-atom | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Robins 1955_ [doi](https://doi.org/10.1016/0001-6160%2855%2990120-6) | Table 2, p. 6, row 53; `ORC-JBVJE5KUUC.f70741` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -38.1 kJ/mol-atom ± 1.7 | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Meschel 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900528-8) | Table 2, p. 6, row 51; `ORC-EUEZJLRZNK.6cc9e0` |  |
| Ta5Si3 (α) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -37.7 kJ/mol-atom ± 4.7 | 298.15 | experimental | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 6, row 52; `ORC-J3HRWCLONB.545108` |  |
| Ta5Si3 (β) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -55.4 kJ/mol-atom | 0 | unspecified | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013 | Table 2, p. 6, row 56; `ORC-GKGRS2OYTE.4e030c` |  |
| Ta5Si3 (β) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -52.4 kJ/mol-atom |  | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Tao 2011_ | Table 2, p. 6, row 57; `ORC-PTF73ZC5H2.14f247` |  |
| Ta5Si3 (β) | [Si3Ta5](https://data.orchid-project.org/compounds/Si3Ta5.html) | -51.6 kJ/mol-atom | 0 | model | -57.039 (mp-aaaaacyn) | -59.481 (oqmd-3573) | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 2, p. 6, row 58; `ORC-L67DIR5REA.e05599` |  |
| TaSi2 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -46.7 kJ/mol-atom | 0 | unspecified | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [4] Broz 2013 | Table 2, p. 6, row 43; `ORC-CGEXAEJBAB.859092` |  |
| TaSi2 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -46 kJ/mol-atom ± 2.5 | 298.15 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [4] Broz 2013; _cites Meschel 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900528-8) | Table 2, p. 6, row 45; `ORC-CSRPNY5H5K.b67f6d` |  |
| TaSi2 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -41.1 kJ/mol-atom | 0 | model | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 2, p. 6, row 48; `ORC-PPNMZ3C2DK.0bc9ac` |  |
| TaSi2 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -38.8 kJ/mol-atom | 298.15 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [4] Broz 2013; _cites Robins 1955_ [doi](https://doi.org/10.1016/0001-6160%2855%2990120-6) | Table 2, p. 6, row 47; `ORC-KKXKQQTQYQ.01cdd0` |  |
| TaSi2 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -32.4 kJ/mol-atom ± 14 | 298.15 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [4] Broz 2013; _cites Myers 1957_ | Table 2, p. 6, row 44; `ORC-BWMYBQKAXC.7f8664` |  |
| TaSi2 | [Si2Ta](https://data.orchid-project.org/compounds/Si2Ta.html) | -22.6 kJ/mol-atom ± 7.8 | 298.15 | experimental | -41.496 (mp-aaaaaqom) | -46.105 (oqmd-8153) | [4] Broz 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 6, row 46; `ORC-5NFY4V4SRX.e93013` |  |

## Other properties

### Phase transition (21)

Table: Phase transition, Si–Ta system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1685 K | 1685 | Si(dia) -> Si(L); _Si(dia): Ta 0_ | experimental | [2] Vahlas 1989; _cites ref. 4_ | Table 4, p. 9, row 3; `ORC-2MEYAL7NWL` |  |
| Phase transition | 1687 K | 1687 | Si(dia) -> Si(L); _Si(dia): Ta 0_ | experimental | [2] Vahlas 1989; _cites ref. 10_ | Table 4, p. 9, row 2; `ORC-5SGM4EPRG3` |  |
| Phase transition | 1687 K | 1687 | Si(dia) -> Si(L); _Si(dia): Ta 0_ | model | [2] Vahlas 1989 | Table 4, p. 9, row 1; `ORC-ITB3QFHYUX` |  |
| Phase transition | 2277 K | 2277 | Liq \<->Si2Ta; _L: Ta 0.3333; Si2Ta: Ta 0.333333_ | model | [3] Drouelle 2013 | Table 5, p. 4, row 17; `ORC-HRRKJA5HGG` |  |
| Phase transition | 2285 K | 2285 | (L) -> Si2Ta; _L: Ta 0.333; Si2Ta: Ta 0.333333_ | model | [2] Vahlas 1989 | Table 4, p. 9, row 6; `ORC-OMBUNV273K` |  |
| Phase transition | 2303 K | 2303 | Liq \<->Si2Ta; _L: Ta 0.3333; Si2Ta: Ta 0.333333_ | model | [3] Drouelle 2013 | Table 5, p. 4, row 18; `ORC-XGJDKIYDOE` |  |
| Phase transition | 2313 K | 2313 | (L) -> Si2Ta; _L: Ta 0.333; Si2Ta: Ta 0.333333_ | experimental | [2] Vahlas 1989; _cites ref. 30_ | Table 4, p. 9, row 7; `ORC-WM5LVE4OHM` |  |
| Phase transition | 2313 K | 2313 | Liq \<->Si2Ta; _L: Ta 0.3333; Si2Ta: Ta 0.333333_ | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 16; `ORC-RCBHQLDBYC` |  |
| Phase transition | 2313 K | 2313 | congruent transformation | experimental | [3] Drouelle 2013; _cites Kocherzhinskii 1981_ | p. 2; `ORC-UXHTDLRS4S.615c63` | “The two stoichiometric compounds Si2Ta and Si3Ta5_HT melt congruently at 2313 and 2823 K respectively.” |
| Phase transition | 2431 K | 2431 | Si5Ta3_LT \<-> Si5Ta3_HT; _Si5Ta3_LT: Ta 0.625; Si5Ta3_HT: Ta 0.625_ | model | [3] Drouelle 2013 | Table 5, p. 4, row 24; `ORC-VCI6ZHV5TP` |  |
| Phase transition | 2433 K | 2433 | Si5Ta3_LT \<-> Si5Ta3_HT; _Si5Ta3_LT: Ta 0.625; Si5Ta3_HT: Ta 0.625_ | model | [3] Drouelle 2013 | Table 5, p. 4, row 23; `ORC-TW2AYTWRNB` |  |
| Phase transition | 2433 K | 2433 | polymorphic: Si5Ta3_LT \<-> Si5Ta3_HT | experimental | [3] Drouelle 2013 | p. 2; `ORC-JU5H4XESAI` | “The polymorphic transition Si5Ta3_LT \<-> Si5Ta3_HT occurs at 2433 K.” |
| Phase transition | 2433.5 K | 2433.5 | Si5Ta3_LT \<-> Si5Ta3_HT; _Si5Ta3_LT: Ta 0.625; Si5Ta3_HT: Ta 0.625_ | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 22; `ORC-YXLDCRH5JK` |  |
| Phase transition | 2814 K | 2814 | Liq\<-> Si3Ta5_HT; _L: Ta 0.625; Si3Ta5_HT: Ta 0.625_ | model | [3] Drouelle 2013 | Table 5, p. 4, row 21; `ORC-ZEB7OJHG47` |  |
| Phase transition | 2817 K | 2817 | Liq\<-> Si3Ta5_HT; _L: Ta 0.625; Si3Ta5_HT: Ta 0.625_ | model | [3] Drouelle 2013 | Table 5, p. 4, row 20; `ORC-W4UVLA6V6Y` |  |
| Phase transition | 2823 K | 2823 | (L) -> Si5Ta3; _L: Ta 0.625_ | experimental | [2] Vahlas 1989; _cites ref. 30_ | Table 4, p. 9, row 11; `ORC-FQ6CTORDUW` |  |
| Phase transition | 2823 K | 2823 | (L) -> Si5Ta3; _L: Ta 0.625_ | model | [2] Vahlas 1989 | Table 4, p. 9, row 10; `ORC-V6ECXECDTR` |  |
| Phase transition | 2823 K | 2823 | Liq\<-> Si3Ta5_HT; _L: Ta 0.625; Si3Ta5_HT: Ta 0.625_ | experimental | [3] Drouelle 2013; _cites Massalski 1990_ | Table 5, p. 4, row 19; `ORC-XYQHG3SW7C` |  |
| Phase transition | 2823 K | 2823 | congruent transformation | experimental | [3] Drouelle 2013; _cites Kocherzhinskii 1981_ | p. 2; `ORC-UXHTDLRS4S.011cf7` | “The two stoichiometric compounds Si2Ta and Si3Ta5_HT melt congruently at 2313 and 2823 K respectively.” |
| Phase transition | 3258 K | 3258 | Ta(bcc) -> Ta(L); _Ta(bcc): Ta 1_ | model | [2] Vahlas 1989 | Table 4, p. 9, row 18; `ORC-HCBF7PGLXC` |  |
| Phase transition | 3258 K | 3258 | Ta(bcc) -> Ta(L); _Ta(bcc): Ta 1_ | experimental | [2] Vahlas 1989; _cites ref. 4_ | Table 4, p. 9, row 19; `ORC-QFHVHLUCRX` |  |

### Formation (19)

Table: Formation, Si–Ta system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: s_ | 0.10907 J/mol-atom/K |  | Si0.25Ta0.75; _alloy: Ta 0.75_ | unspecified | [3] Drouelle 2013 | Table 2, p. 2, row 42; `ORC-WLPPQCN343` |  |
| Entropy of formation; _printed: s_ | -1.03482 J/mol-atom/K |  | Si0.3333Ta0.6667; _alloy: Ta 0.6667_ | unspecified | [3] Drouelle 2013 | Table 2, p. 2, row 41; `ORC-6KK6LN4TWX` |  |
| Entropy of formation; _printed: s_ | 0.556494 J/mol-atom/K |  | Si0.375Ta0.625_HT; _alloy: Ta 0.625_ | unspecified | [3] Drouelle 2013 | Table 2, p. 2, row 40; `ORC-PMUBQT5DO6` |  |
| Entropy of formation; _printed: s_ | 0.276595 J/mol-atom/K |  | Si0.375Ta0.625_LT; _alloy: Ta 0.625_ | unspecified | [3] Drouelle 2013 | Table 2, p. 2, row 35; `ORC-Y5HTSFMF6Q` |  |
| Entropy of formation; _printed: s_ | 3.86421 J/mol-atom/K |  | Si0.6667Ta0.3333; _alloy: Ta 0.3333_ | unspecified | [3] Drouelle 2013 | Table 2, p. 2, row 34; `ORC-6B525IKFU2` |  |
| Entropy of formation; _printed: s (Redlich–Kister)_ | 0.10907 J/mol-atom/K | 298.15 | Si0.25Ta0.75; _alloy: Ta 0.75_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 25; `ORC-GDYQLC5AAG.70774e` |  |
| Entropy of formation; _printed: s (Kaptay)_ | -0.422237 J/mol-atom/K | 298.15 | Si0.25Ta0.75; _alloy: Ta 0.75_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 25; `ORC-GDYQLC5AAG.abe02a` |  |
| Entropy of formation; _printed: s (Kaptay)_ | 0.581966 J/mol-atom/K | 298.15 | Si0.3333Ta0.6667; _alloy: Ta 0.6667_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 22; `ORC-RHDBHMGIWB.0b02d4` |  |
| Entropy of formation; _printed: s (Redlich–Kister)_ | -1.03482 J/mol-atom/K | 298.15 | Si0.3333Ta0.6667; _alloy: Ta 0.6667_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 22; `ORC-RHDBHMGIWB.f9ad42` |  |
| Entropy of formation; _printed: s (Redlich–Kister)_ | 0.556494 J/mol-atom/K | 298.15 | Si0.375Ta0.625_HT; _alloy: Ta 0.625_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 16; `ORC-WJ5E2FLXGU.a7d892` |  |
| Entropy of formation; _printed: s (Redlich–Kister)_ | 0.276595 J/mol-atom/K | 298.15 | Si0.375Ta0.625_LT; _alloy: Ta 0.625_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 8; `ORC-25XRJVWZGZ.4d903d` |  |
| Entropy of formation; _printed: s (Kaptay)_ | -0.777086 J/mol-atom/K | 298.15 | Si0.375Ta0.625_LT; _alloy: Ta 0.625_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 8; `ORC-25XRJVWZGZ.d7e6d4` |  |
| Entropy of formation; _printed: s (Redlich–Kister)_ | 3.86421 J/mol-atom/K | 298.15 | Si0.6667Ta0.3333; _alloy: Ta 0.3333_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 6; `ORC-52ICL23NCF.4797d4` |  |
| Entropy of formation; _printed: s_ | -13.95 J/mol-atom/K | 1027 | Si0.3333Ta0.6667; _alloy: Ta 0.6667_ | experimental | [3] Drouelle 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 2, row 23; `ORC-GIH62I4VZW.20f2dc` |  |
| Entropy of formation; _printed: s_ | -13.34 J/mol-atom/K | 1027 | Si0.375Ta0.625_HT; _alloy: Ta 0.625_ | experimental | [3] Drouelle 2013; _cites Levine 1969_ [doi](https://doi.org/10.1149/1.2411545) | Table 2, p. 2, row 19; `ORC-OVSTHRO2TO.cff80a` |  |
| Entropy of formation; _printed: s_ | 13.57 J/mol-atom/K | 1760.5 | Si0.6667Ta0.3333; _alloy: Ta 0.3333_ | experimental | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 4; `ORC-OLNLWPIRLP.c37eb0` |  |
| Entropy of formation; _printed: s_ | -0.339 J/mol-atom/K | 1900 | Si0.375Ta0.625_HT; _alloy: Ta 0.625_ | experimental | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 17; `ORC-WLRX6KX33K.3c6241` |  |
| Entropy of formation; _printed: s_ | -1.6 J/mol-atom/K | 2045 | Si0.3333Ta0.6667; _alloy: Ta 0.6667_ | experimental | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 21; `ORC-345NTR6DDL.0c5f20` |  |
| Entropy of formation; _printed: s_ | -2.17 J/mol-atom/K | 2087.5 | Si0.25Ta0.75; _alloy: Ta 0.75_ | experimental | [3] Drouelle 2013; _cites Myers 1957_ [doi](https://doi.org/10.1021/ja01560a007) | Table 2, p. 2, row 26; `ORC-K6GMSBONRZ.3fe8b5` |  |

### Heat capacity / entropy / enthalpy (2)

Table: Heat capacity / entropy / enthalpy, Si–Ta system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: s = b_ | -0.776768 J/mol-atom/K | 298.15 | Si0.375Ta0.625_HT; _alloy: Ta 0.625_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 16; `ORC-WJ5E2FLXGU.514a85` |  |
| Entropy; _printed: s = b_ | 0.024162 J/mol-atom/K | 298.15 | Si0.6667Ta0.3333; _alloy: Ta 0.3333_ | model | [3] Drouelle 2013 | Table 2, p. 2, row 6; `ORC-52ICL23NCF.7bf4cd` |  |

### Crystal structure (20)

Table: Crystal structure, Si–Ta system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 6.19 Å | 0 | Ta2Si; _alloy: Ta 0.666667_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 10; `ORC-63V5AL7G7N.abb574` |  |
| Lattice a | 10.195 Å | 0 | Ta3Si; _alloy: Ta 0.75_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 7; `ORC-WRCC5O7MHE.fb4d7a` |  |
| Lattice a | 6.552 Å | 0 | Ta5Si3 (α); _alloy: Ta 0.625_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 14; `ORC-GA6DCARM6W.b39421` |  |
| Lattice a | 9.892 Å |  | Ta5Si3 (β); _alloy: Ta 0.625_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 17; `ORC-SS6SJ4NY7T.60e4a1` |  |
| Lattice a | 9.913 Å | 0 | Ta5Si3 (β); _alloy: Ta 0.625_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 18; `ORC-WYUOPWBVFS.8f032a` |  |
| Lattice a | 4.792 Å | 0 | TaSi2; _alloy: Ta 0.333333_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 33; `ORC-HZZSXNRVQY.86a0f6` |  |
| Lattice a | 6.172 Å | 298.15 | Ta2Si; _alloy: Ta 0.666667_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 9; `ORC-2JZADLJGNS.0998c5` |  |
| Lattice a | 10.184 Å | 298.15 | Ta3Si; _alloy: Ta 0.75_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 6; `ORC-ZIE3IGMX4P.1b5920` |  |
| Lattice a | 6.519 Å | 298.15 | Ta5Si3 (α); _alloy: Ta 0.625_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 13; `ORC-LEM54YMIOZ.337996` |  |
| Lattice a | 4.784 Å | 298.15 | TaSi2; _alloy: Ta 0.333333_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 32; `ORC-4ZLLKCQ3NC.56eea4` |  |
| Lattice c | 5.071 Å | 0 | Ta2Si; _alloy: Ta 0.666667_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 10; `ORC-63V5AL7G7N.12c4d7` |  |
| Lattice c | 5.206 Å | 0 | Ta3Si; _alloy: Ta 0.75_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 7; `ORC-WRCC5O7MHE.87c185` |  |
| Lattice c | 11.911 Å | 0 | Ta5Si3 (α); _alloy: Ta 0.625_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 14; `ORC-GA6DCARM6W.4501f3` |  |
| Lattice c | 5.042 Å |  | Ta5Si3 (β); _alloy: Ta 0.625_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 17; `ORC-SS6SJ4NY7T.365573` |  |
| Lattice c | 5.078 Å | 0 | Ta5Si3 (β); _alloy: Ta 0.625_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 18; `ORC-WYUOPWBVFS.54b5eb` |  |
| Lattice c | 6.572 Å | 0 | TaSi2; _alloy: Ta 0.333333_ | DFT | [4] Broz 2013 | Table 1, p. 3, row 33; `ORC-HZZSXNRVQY.544496` |  |
| Lattice c | 5.05 Å | 298.15 | Ta2Si; _alloy: Ta 0.666667_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 9; `ORC-2JZADLJGNS.02daa2` |  |
| Lattice c | 5.183 Å | 298.15 | Ta3Si; _alloy: Ta 0.75_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 6; `ORC-ZIE3IGMX4P.b23980` |  |
| Lattice c | 11.87 Å | 298.15 | Ta5Si3 (α); _alloy: Ta 0.625_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 13; `ORC-LEM54YMIOZ.59e461` |  |
| Lattice c | 6.568 Å | 298.15 | TaSi2; _alloy: Ta 0.333333_ | unspecified | [4] Broz 2013; _cites Guo 2009_ [doi](https://doi.org/10.1007/s11669-009-9579-x) | Table 1, p. 3, row 32; `ORC-4ZLLKCQ3NC.996b39` |  |

## Sources

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

1. Zhongnan Guo, Wenxia Yuan, Yu Sun, Zhoufei Cai, Zhiyu Qiao, Thermodynamic Assessment of the Si-Ta and Si-W Systems, J. Phase Equilib. Diffus. 30, 564-570 (2009). [doi:10.1007/s11669-009-9579-x](https://doi.org/10.1007/s11669-009-9579-x)
2. C. Vahlas, P.Y. Chevalier, E. Blanquet, A thermodynamic evaluation of four Si-M (M = Mo, Ta, Ti, W) binary systems, Calphad 13, 273-292 (1989). [doi:10.1016/0364-5916(89)90007-2](https://doi.org/10.1016/0364-5916%2889%2990007-2)
3. I. Drouelle, C. Servant, Thermodynamic assessment of the Si–Ta system, Journal of Alloys and Compounds 551, 293-299 (2013). [doi:10.1016/j.jallcom.2012.09.148](https://doi.org/10.1016/j.jallcom.2012.09.148)
4. P. Broz, A.U. Khan, H. Niu, X.-Q. Chen, D. Li, J. Vrestal et al., The system Ta–V–Si: Thermodynamic modeling, Journal of Solid State Chemistry 199, 171-180 (2013). [doi:10.1016/j.jssc.2012.12.003](https://doi.org/10.1016/j.jssc.2012.12.003)

## 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/).