# B–Ta system

> B–Ta system: 74 accepted literature values (invariant reaction 60, formation 14) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

74 accepted literature values from 2 paper(s) (experimental 32, model 17, DFT 18, unspecified 7); 0 calculated phase diagram(s). 10 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/B-TA.json) · [CSV](https://data.orchid-project.org/systems/B-TA.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#B-TA) · [phases (13)](https://data.orchid-project.org/phases/pages/B-TA.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/B-TA.html) · [Markdown](https://data.orchid-project.org/systems/B-TA.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 32 |
| model | 17 |
| DFT | 18 |
| unspecified | 7 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 60 |
| formation | 14 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/B/B-TA.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/B/B-TA.json) · [CALPHAD hull TaB-17OuY](https://data.orchid-project.org/hulls/calphad-sgte/B/B-TA--TaB-17OuY.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the B–Ta system (60)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 3303.15 | L + TaB -> Ta3B4 | L: Ta 0.41; TaB: Ta 0.483; Ta3B4: Ta 0.431 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 1; `ORC-EORADNHLYH` |  |
| 3303 | L + TaB(ht) -> Ta3B4 | L: B 0.59; TaB(ht): B 0.52; Ta3B4: B 0.56 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 30; `ORC-Q4BZRTCTJ5` |  |
| 3303 | L + TaB(ht) -> Ta3B4 | L: B 0.57; TaB(ht): B 0.52; Ta3B4: B 0.55 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 29; `ORC-S3L2S7L4QQ` |  |
| 3300.15 | L + TaB -> Ta3B4 | L: Ta 0.407; TaB: Ta 0.5; Ta3B4: Ta 0.437 | model | [1] OuYang 2017 | Table 2, p. 5, row 3; `ORC-JBPZLG3SGX` |  |
| 3300 | L + TaB(ht) -> Ta3B4 | L: B 0.593; TaB(ht): B 0.5; Ta3B4: B 0.563 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 28; `ORC-MH3A5XWQG4` |  |
| 3284 | L + TaB(ht) -> Ta3B4 | L: B 0.595; TaB(ht): B 0.495; Ta3B4: B 0.571 | model | [2] Silva 2018 | Table 3, p. 19, row 27; `ORC-UCV7UEISF4` |  |
| 3282.15 | eutectic: L -> TaB2 + Ta3B4 | L: Ta 0.372; TaB2: Ta 0.334; Ta3B4: Ta 0.437 | model | [1] OuYang 2017 | Table 2, p. 5, row 6; `ORC-LD5ADDKCG5` |  |
| 3282 | eutectic: L -> TaB2 + Ta3B4 | L: B 0.628; TaB2: B 0.666; Ta3B4: B 0.563 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 32; `ORC-ETARBZ3YJE` |  |
| 3276 | eutectic: L -> TaB2 + Ta3B4 | L: B 0.616; TaB2: B 0.673; Ta3B4: B 0.571 | model | [2] Silva 2018 | Table 3, p. 19, row 31; `ORC-FTC2OTRP7C` |  |
| 3263.15 | eutectic: L -> TaB2 + Ta3B4 | L: Ta 0.39; TaB2: Ta 0.381; Ta3B4: Ta 0.422 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 4; `ORC-H5LQLJKARX` |  |
| 3263 | eutectic: L -> TaB2 + Ta3B4 | L: B 0.61; TaB2: B 0.61; Ta3B4: B 0.58 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 33; `ORC-7WU4BPB4KQ` |  |
| 3263 | eutectic: L -> TaB2 + Ta3B4 | L: B 0.61; TaB2: B 0.63; Ta3B4: B 0.59 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 34; `ORC-JZKES343WD` |  |
| 3253.15 | L + TaB -> Ta3B4 | L: Ta 0.437; TaB: Ta 0.5; Ta3B4: Ta 0.439 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 2; `ORC-RQDX7OZBRX` |  |
| 3223.15 | eutectic: L -> TaB2 + Ta3B4 | L: Ta 0.419; TaB2: Ta 0.333; Ta3B4: Ta 0.437 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 5; `ORC-PLFTATCSFX` |  |
| 3168 | Ta3B4 + TaB(ht) -> TaB(rt) | Ta3B4: B 0.571; TaB(ht): B 0.496 | model | [2] Silva 2018 | Table 3, p. 19, row 25; `ORC-LWXX4KUZKH` |  |
| 3008 | TaB(ht) -> TaB(rt) + L | TaB(ht): B 0.487; TaB(rt): B 0.5; L: B 0.285 | model | [2] Silva 2018 | Table 3, p. 19, row 24; `ORC-ZD6KL2HIQH` |  |
| 2848 | Ta3B4 + TaB(rt) -> Ta5B6 | Ta3B4: B 0.571; TaB(rt): B 0.5; Ta5B6: B 0.545 | model | [2] Silva 2018 | Table 3, p. 19, row 26; `ORC-QFH6ELKK4F` |  |
| 2748.15 | L + TaB -> Ta2B | L: Ta 0.758; TaB: Ta 0.5; Ta2B: Ta 0.667 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 8; `ORC-D3KJOAMMCW` |  |
| 2718.15 | eutectic: L -> Ta2B + (Ta) | L: Ta 0.785; Ta2B: Ta 0.667; (Ta): Ta 0.988 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 11; `ORC-A2RNNT7X4R` |  |
| 2691 | L + TaB(rt) -> Ta2B | L: B 0.212; TaB(rt): B 0.5; Ta2B: B 0.295 | model | [2] Silva 2018 | Table 3, p. 19, row 7; `ORC-TRYACQEN2J` |  |
| 2690.15 | L + TaB -> Ta2B | L: Ta 0.731; TaB: Ta 0.501; Ta2B: Ta 0.712 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 7; `ORC-UMR5RSZS6E` |  |
| 2690 | L + TaB(rt) -> Ta2B | L: B 0.27; TaB(rt): B 0.49; Ta2B: B 0.3 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 12; `ORC-3NKSGUIZD2` |  |
| 2658 | eutectic: L -> Ta2B + BCC | L: B 0.23; Ta2B: B 0.28; BCC: B 0.02 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 6; `ORC-QH6QA7THR5` |  |
| 2657.15 | L + TaB -> Ta2B | L: Ta 0.821; TaB: Ta 0.5; Ta2B: Ta 0.667 | model | [1] OuYang 2017 | Table 2, p. 5, row 9; `ORC-SEGFM45POP` |  |
| 2657 | L + TaB(rt) -> Ta2B | L: B 0.179; TaB(rt): B 0.5; Ta2B: B 0.333 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 8; `ORC-CSPVUWO6BN` |  |
| 2653 | L + TaB(rt) -> Ta2B | L: B 0.27; TaB(rt): B 0.49; Ta2B: B 0.29 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 10; `ORC-2GX3BCUNFG` |  |
| 2653 | L + TaB(rt) -> Ta2B | TaB(rt): B 0.5, Ta 0.5; Ta2B: B 0.333333, Ta 0.666667 | experimental | [2] Silva 2018; _cites System 1971_ | Table 3, p. 19, row 11; `ORC-5BBWHF6M56` |  |
| 2638 | eutectic: L -> Ta2B + BCC | L: B 0.187; Ta2B: B 0.279; BCC: B 0.026 | model | [2] Silva 2018 | Table 3, p. 19, row 1; `ORC-6OUO7JECQA` |  |
| 2633.15 | eutectic: L -> Ta2B + (Ta) | L: Ta 0.77; Ta2B: Ta 0.701; (Ta): Ta 0.98 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 10; `ORC-HRDQNFGLBY` |  |
| 2633 | eutectic: L -> Ta2B + BCC | L: B 0.23; Ta2B: B 0.28; BCC: B 0.02 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 4; `ORC-AUX6JA2FGZ` |  |
| 2633 | eutectic: L -> Ta2B + BCC | Ta2B: B 0.333333, Ta 0.666667 | experimental | [2] Silva 2018; _cites System 1971_ | Table 3, p. 19, row 5; `ORC-E3E5ASSPHE` |  |
| 2630.15 | eutectic: L -> Ta2B + (Ta) | L: Ta 0.829; Ta2B: Ta 0.667; (Ta): Ta 0.967 | model | [1] OuYang 2017 | Table 2, p. 5, row 13; `ORC-XWRSAQDCGW` |  |
| 2630 | eutectic: L -> Ta2B + BCC | L: B 0.171; Ta2B: B 0.333; BCC: B 0.033 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 2; `ORC-4RCAETQOBK` |  |
| 2503.15 | TaB + Ta2B -> Ta3B2 | TaB: Ta 0.5; Ta2B: Ta 0.667; Ta3B2: Ta 0.6 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 15; `ORC-QGDJLOTKWV` |  |
| 2453.15 | TaB + Ta2B -> Ta3B2 | TaB: Ta 0.505; Ta2B: Ta 0.667; Ta3B2: Ta 0.59 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 14; `ORC-NVJ7MRTOPO` |  |
| 2453.15 | TaB + Ta2B -> Ta3B2 | TaB: Ta 0.5; Ta2B: Ta 0.667; Ta3B2: Ta 0.6 | model | [1] OuYang 2017 | Table 2, p. 5, row 16; `ORC-UTTVSLLHND` |  |
| 2453 | TaB(rt) + Ta2B -> Ta3B2 | TaB(rt): B 0.495; Ta2B: B 0.31; Ta3B2: B 0.41 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 21; `ORC-BG6IE62SPA` |  |
| 2453 | TaB(rt) + Ta2B -> Ta3B2 | TaB(rt): B 0.5; Ta2B: B 0.32; Ta3B2: B 0.4 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 23; `ORC-BPJ4ZQG5JV` |  |
| 2453 | TaB(rt) + Ta2B -> Ta3B2 | TaB(rt): B 0.5; Ta2B: B 0.333; Ta3B2: B 0.4 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 20; `ORC-UQADFJIW7M` |  |
| 2445 | TaB(rt) + Ta2B -> Ta3B2 | TaB(rt): B 0.5; Ta2B: B 0.306; Ta3B2: B 0.4 | model | [2] Silva 2018 | Table 3, p. 19, row 19; `ORC-A7DS76UIKR` |  |
| 2343.15 | eutectic: L -> (B) + TaB2 | L: Ta 0.02; (B): Ta 0; TaB2: Ta 0.26 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 19; `ORC-XOAS6TWXCG` |  |
| 2343 | eutectic: L -> (βB) + TaB2 | TaB2: B 0.666667, Ta 0.333333 | experimental | [2] Silva 2018; _cites System 1971_ | Table 3, p. 19, row 38; `ORC-CI7R76W4XF` |  |
| 2343 | eutectic: L -> (βB) + TaB2 | L: B 0.98; (βB): B 0.99; TaB2: B 0.74 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 37; `ORC-S5T3LM3SDX` |  |
| 2329.15 | eutectic: L -> (B) + TaB2 | L: Ta 0.0179; (B): Ta 0; TaB2: Ta 0.256 | model | [1] OuYang 2017 | Table 2, p. 5, row 20; `ORC-46MQ2THFZH` |  |
| 2329 | eutectic: L -> (βB) + TaB2 | L: B 0.982; (βB): B 1; TaB2: B 0.744 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 36; `ORC-C7AULTJ7LO` |  |
| 2328.15 | eutectic: L -> (B) + TaB2 | L: Ta 0.035; (B): Ta 9.000e-4; TaB2: Ta 0.261 | experimental | [1] OuYang 2017; _cites Leitnaker 1961_ [doi](https://doi.org/10.1149/1.2428137) | Table 2, p. 5, row 17; `ORC-WHA3IKWC3Y` |  |
| 2328 | eutectic: L -> (βB) + TaB2 | L: B 0.98; (βB): B 1; TaB2: B 0.74 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 39; `ORC-ALMDGGEFO4` |  |
| 2325 | eutectic: L -> (βB) + TaB2 | L: B 0.978; (βB): B 1; TaB2: B 0.728 | model | [2] Silva 2018 | Table 3, p. 19, row 35; `ORC-76PFPSOPNU` |  |
| 2313.15 | Ta2B -> Ta3B2 + (Ta) | Ta2B: Ta 0.7; Ta3B2: Ta 0.61; (Ta): Ta 1 | experimental | [1] OuYang 2017; _cites Okamoto 1993_ [doi](https://doi.org/10.1007/bf02668242) | Table 2, p. 5, row 21; `ORC-ODUNAXGZDB` |  |
| 2313 | Ta2B -> BCC + Ta3B2 | Ta2B: B 0.3; BCC: B 0; Ta3B2: B 0.39 | experimental | [2] Silva 2018; _cites 393–394 1993_ | Table 3, p. 19, row 16; `ORC-5F26ONGTO6` |  |
| 2313 | Ta2B -> BCC + Ta3B2 | Ta2B: B 0.3; BCC: B 0.01; Ta3B2: B 0.38 | experimental | [2] Silva 2018; _cites Rudy 1969_ | Table 3, p. 19, row 18; `ORC-NLEIK5YRU5` |  |
| 2313 | Ta2B -> BCC + Ta3B2 | Ta2B: B 0.333333, Ta 0.666667; Ta3B2: B 0.4, Ta 0.6 | experimental | [2] Silva 2018; _cites System 1971_ | Table 3, p. 19, row 17; `ORC-X7JFFP2LAY` |  |
| 2243 | TaB(rt) + Ta2B -> Ta3B2 | TaB(rt): B 0.5, Ta 0.5; Ta2B: B 0.333333, Ta 0.666667; Ta3B2: B 0.4, Ta 0.6 | experimental | [2] Silva 2018; _cites System 1971_ | Table 3, p. 19, row 22; `ORC-VJNFRADF6Y` |  |
| 2219.15 | Ta2B -> Ta3B2 + (Ta) | Ta2B: Ta 0.667; Ta3B2: Ta 0.6; (Ta): Ta 0.992 | model | [1] OuYang 2017 | Table 2, p. 5, row 24; `ORC-JYT3OEHM46` |  |
| 2219 | Ta2B -> BCC + Ta3B2 | Ta2B: B 0.333; BCC: B 0.008; Ta3B2: B 0.4 | DFT | [2] Silva 2018; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 3, p. 19, row 14; `ORC-O46HPM5RXE` |  |
| 2206 | Ta2B -> BCC + Ta3B2 | Ta2B: B 0.303; BCC: B 0.006; Ta3B2: B 0.4 | model | [2] Silva 2018 | Table 3, p. 19, row 13; `ORC-Z4UXLFMRRK` |  |
| 2198 | Ta2B -> BCC + Ta3B2 | Ta2B: B 0.333333, Ta 0.666667; Ta3B2: B 0.4, Ta 0.6 | experimental | [2] Silva 2018; _cites Chad 2006_ [doi](https://doi.org/10.1007/bf02736442) | Table 3, p. 19, row 15; `ORC-GOYHOT7GFL` |  |
| 2193.15 | Ta2B -> Ta3B2 + (Ta) | Ta2B: Ta 0.667; Ta3B2: Ta 0.6; (Ta): Ta 0.987 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 22; `ORC-ZJL6AYEDL4` |  |
| 2183.15 | eutectic: L -> (B) + TaB2 | L: Ta 0.062; (B): Ta 0; TaB2: Ta 0.333 | unspecified | [1] OuYang 2017; _cites Kaufman 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990004-4) | Table 2, p. 5, row 18; `ORC-JZ76MGOK2C` |  |
| 2173.15 | Ta2B -> Ta3B2 + (Ta) | Ta2B: B 0.333333, Ta 0.666667; Ta3B2: B 0.4, Ta 0.6 | experimental | [1] OuYang 2017; _cites Chad 2006_ [doi](https://doi.org/10.1007/bf02736442) | Table 2, p. 5, row 23; `ORC-HW3SQW6YCG` |  |

## 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, B–Ta system (14)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Ta2B |  | -63.842 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017 | Table 1, p. 4, row 1; `ORC-HESQLUIWOB` |  |
| Ta2B |  | -51.973 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 1, p. 4, row 3; `ORC-FVJMDBGR22` |  |
| Ta3B2 |  | -71.3 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017; _cites Qi 2014_ | Table 1, p. 4, row 6; `ORC-VGMMQLZODX` |  |
| Ta3B2 |  | -67.647 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017 | Table 1, p. 4, row 4; `ORC-7BRGOIHAWY` |  |
| Ta3B4 |  | -80.055 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 1, p. 4, row 13; `ORC-KM6Q5LMCOG` |  |
| Ta3B4 |  | -76.212 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017 | Table 1, p. 4, row 11; `ORC-JNRM625MX5` |  |
| TaB |  | -83.5 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017; _cites Qi 2013_ | Table 1, p. 4, row 10; `ORC-BDUG22C7RT` |  |
| TaB |  | -83.218 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 1, p. 4, row 9; `ORC-4LQMR5BI5R` |  |
| TaB |  | -81.007 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017 | Table 1, p. 4, row 7; `ORC-5BJHYXOZI3` |  |
| TaB2 |  | -67.7 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017; _cites Zhang 2015_ [doi](https://doi.org/10.1016/j.jallcom.2015.01.144) | Table 1, p. 4, row 16; `ORC-5RNKJUQLXV` |  |
| TaB2 | [TaB2](https://data.orchid-project.org/compounds/TaB2.html) | -64.9 kJ/mol-atom | 298.15 | experimental | -62.64 (mp-aaaaabqq) | -62.619 (oqmd-5807) | [1] OuYang 2017; _cites Kirpichev 1979_ | Table 1, p. 4, row 17; `ORC-ENOMSME5IX` |  |
| TaB2 |  | -64.062 kJ/mol-atom | 0 | DFT |  |  | [1] OuYang 2017 | Table 1, p. 4, row 14; `ORC-FHP5CO6FS6` |  |
| TaB2 | [TaB2](https://data.orchid-project.org/compounds/TaB2.html) | -62.9 kJ/mol-atom | 298.15 | experimental | -62.64 (mp-aaaaabqq) | -62.619 (oqmd-5807) | [1] OuYang 2017; _cites Johnson 1967_ [doi](https://doi.org/10.1021/je60035a034) | Table 1, p. 4, row 18; `ORC-PTU6CIJMOI` |  |
| TaB2 | [TaB2](https://data.orchid-project.org/compounds/TaB2.html) | -53.3 kJ/mol-atom | 298.15 | experimental | -62.64 (mp-aaaaabqq) | -62.619 (oqmd-5807) | [1] OuYang 2017; _cites Meschel 1993_ [doi](https://doi.org/10.1007/bf02656515) | Table 1, p. 4, row 19; `ORC-NWHOAUO467` |  |

## Sources

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

1. Xuemei OuYang, Fucheng Yin, Jingxian Hu, Ye Liu, Zhaohui Long, Thermodynamic Modeling of B-Ta and B-C-Ta Systems, J. Phase Equilib. Diffus. 38, 874-886 (2017). [doi:10.1007/s11669-017-0603-2](https://doi.org/10.1007/s11669-017-0603-2)
2. Antonio Augusto Araujo Pinto da Silva, Flavio Ferreira, Belmira Benedita de Lima-Kühn, Gilberto Carvalho Coelho, Carlos Angelo Nunes, Pauline Vilasi et al., The Ta-B system: Key experiments and thermodynamic modeling, Calphad 63, 107-115 (2018). [doi:10.1016/j.calphad.2018.08.012](https://doi.org/10.1016/j.calphad.2018.08.012)

## 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/).