# Ca–Mg–Si system

> Ca–Mg–Si system: 63 accepted literature values (invariant reaction 22, phase equilibrium 18, crystal structure 13, phase transition 9) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

63 accepted literature values from 1 paper(s) (experimental 38, model 25); 0 calculated phase diagram(s). 57 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/CA-MG-SI.json) · [CSV](https://data.orchid-project.org/systems/CA-MG-SI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CA-MG-SI) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CA-MG-SI.html) · [Markdown](https://data.orchid-project.org/systems/CA-MG-SI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 38 |
| model | 25 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 22 |
| phase transition | 9 |
| phase equilibrium | 18 |
| crystal structure | 13 |
| other property | 1 |

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Ca–Mg–Si system (22)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1500.15 | other: Liquid = CaSi + CaMgSi | L: Ca 0.4178, Mg 0.1848 | model | [1] Gröbner 2003 | Table 6, p. 8, row 1; `ORC-IERF6SZHLG` |  |
| 1477.15 | other: Liquid -> Ca2Si + CaMgSi | L: Ca 0.5222, Mg 0.1412 | model | [1] Gröbner 2003 | Table 6, p. 8, row 2; `ORC-6OOIR6BPJL` |  |
| 1476.95 | quasi-peritectic: Liquid + CaSi -> CaMgSi + Ca5Si3 | L: Ca 0.5248, Mg 0.1148 | model | [1] Gröbner 2003 | Table 6, p. 8, row 3; `ORC-FK4D6SSTR5` |  |
| 1476.85 | eutectic: Liquid -> Ca2Si + CaMgSi + Ca5Si3 | L: Ca 0.5259, Mg 0.121 | model | [1] Gröbner 2003 | Table 6, p. 8, row 4; `ORC-TXZSZETIBN` |  |
| 1423.45 | other: Liquid -> CaSi + Ca7Mg6Si14 | L: Ca 0.2539, Mg 0.2301 | model | [1] Gröbner 2003 | Table 6, p. 8, row 5; `ORC-5YOJK3FS6S` |  |
| 1423.15 | quasi-peritectic: Liquid + CaSi -> CaMgSi + Ca7Mg6Si14 | L: Ca 0.2459, Mg 0.2522 | model | [1] Gröbner 2003 | Table 6, p. 8, row 7; `ORC-I7TS6MK6KF` |  |
| 1423.15 | quasi-peritectic: Liquid + CaSi -> CaMgSi + Ca7Mg6Si14 |  | experimental | [1] Gröbner 2003 | Table 6, p. 8, row 6; `ORC-RP4L26UIEZ` |  |
| 1349.15 | quasi-peritectic: Liquid + CaSi -> Ca14Si19 + Ca7Mg6Si14 | L: Ca 0.2821, Mg 0.0297 | model | [1] Gröbner 2003 | Table 6, p. 8, row 8; `ORC-6IC5HNFZIR` |  |
| 1330.15 | other: Liquid -> Ca7Mg6Si14 + Mg2Si | L: Ca 0.0401, Mg 0.5926 | model | [1] Gröbner 2003 | Table 6, p. 8, row 9; `ORC-UZ57IYPG5N` |  |
| 1328.15 | other: Liquid -> Ca7Mg6Si14 + (Si) | L: Ca 0.155, Mg 0.1318 | model | [1] Gröbner 2003 | Table 6, p. 8, row 10; `ORC-A5FJLESEA2` |  |
| 1327.15 | quasi-peritectic: Liquid + Ca7Mg6Si14 -> CaMgSi + Mg2Si | L: Ca 0.0441, Mg 0.6289 | model | [1] Gröbner 2003 | Table 6, p. 8, row 11; `ORC-5WKUHNHXPN` |  |
| 1298.15 | quasi-peritectic: Liquid + Ca14Si19 -> CaSi2 + Ca7Mg6Si14 | L: Ca 0.2458, Mg 0.0179 | model | [1] Gröbner 2003 | Table 6, p. 8, row 12; `ORC-G24YBKJIAD` |  |
| 1293.15 | eutectic: Liquid -> CaSi2 + Ca7Mg6Si14 + (Si) | L: Ca 0.2384, Mg 0.0184 | model | [1] Gröbner 2003 | Table 6, p. 8, row 13; `ORC-HR3P5BLVXE` |  |
| 1221.15 | eutectic: Liquid -> Mg2Si + Ca7Mg6Si14 + (Si) |  | experimental | [1] Gröbner 2003 | Table 6, p. 8, row 14; `ORC-62CZYOVBTM` |  |
| 1216.15 | eutectic: Liquid -> Mg2Si + Ca7Mg6Si14 + (Si) | L: Ca 0.0073, Mg 0.449 | model | [1] Gröbner 2003 | Table 6, p. 8, row 15; `ORC-OJZJZBSGVF` |  |
| 983.15 | other: Liquid -> CaMgSi + CaMg2 | L: Ca 0.3313, Mg 0.6683 | model | [1] Gröbner 2003 | Table 6, p. 8, row 16; `ORC-JZJHL4KVZK` |  |
| 982.15 | quasi-peritectic: Liquid + CaMgSi -> Ca2Si + CaMg2 |  | experimental | [1] Gröbner 2003 | Table 6, p. 8, row 17; `ORC-TSPPROANC4` |  |
| 982.15 | quasi-peritectic: Liquid + CaMgSi -> Ca2Si + CaMg2 | L: Ca 0.3482, Mg 0.6514 | model | [1] Gröbner 2003 | Table 6, p. 8, row 18; `ORC-W5ZY4EC4NO` |  |
| 918.15 | other: Liquid -> CaMgSi + (Mg) | L: Ca 0.0022, Mg 0.9944 | model | [1] Gröbner 2003 | Table 6, p. 8, row 19; `ORC-LYMAO7TTFJ` |  |
| 910.15 | eutectic: Liquid -> CaMgSi + Mg2Si + (Mg) | L: Ca 4.000e-4, Mg 0.9851 | model | [1] Gröbner 2003 | Table 6, p. 8, row 20; `ORC-2Y2RFJDUFV` |  |
| 789.15 | quasi-peritectic: Liquid + CaMgSi -> CaMg2 + (Mg) | L: Ca 0.1058, Mg 0.8942 | model | [1] Gröbner 2003 | Table 6, p. 8, row 21; `ORC-JPMMUUEOQT` |  |
| 719.15 | quasi-peritectic: Liquid + Ca2Si -> CaMg2 + β(Ca) | L: Ca 0.7078, Mg 0.2921 | model | [1] Gröbner 2003 | Table 6, p. 8, row 22; `ORC-FYLLTXHOUF` |  |

## Other properties

### Phase transition (9)

Table: Phase transition, Ca–Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1413.15 K | 1413.15 | L/L + CaSi; _alloy: Ca 0.34, Mg 0.16, Si 0.5_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 7; `ORC-A7T7JBGD7Q` |  |
| Phase transition | 1424.15 K | 1424.15 | L/L + CaSi; _alloy: Ca 0.34, Mg 0.16, Si 0.5_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 10; `ORC-2I4ZPTA7GB` |  |
| Phase transition | 1446.15 K | 1446.15 | L/L + CaSi; _alloy: Ca 0.34, Mg 0.16, Si 0.5_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 6; `ORC-M4OUDFXTSX` |  |
| Phase transition | 1447.15 K | 1447.15 | L/L + Ca2Si; _alloy: Ca 0.34, Mg 0.5, Si 0.16_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 57; `ORC-PK77FH52V7` |  |
| Phase transition | 1447.45 K | 1447.45 | L/L + Ca2Si; _alloy: Ca 0.34, Mg 0.5, Si 0.16_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 56; `ORC-POIZWP4NQN` |  |
| Phase transition | 1448.15 K | 1448.15 | L/L + CaSi; _alloy: Ca 0.34, Mg 0.16, Si 0.5_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 8; `ORC-UKWPR4RQON` |  |
| Phase transition | 1451.15 K | 1451.15 | L/L + CaSi; _alloy: Ca 0.34, Mg 0.16, Si 0.5_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 9; `ORC-HIVBG7HVWC` |  |
| Phase transition | 1454.75 K | 1454.75 | L/L + Ca2Si; _alloy: Ca 0.34, Mg 0.5, Si 0.16_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 55; `ORC-UGBRMARGAY` |  |
| Phase transition | 1467.45 K | 1467.45 | L/L + Ca2Si; _alloy: Ca 0.34, Mg 0.5, Si 0.16_ | experimental | [1] Gröbner 2003 | Table 5, p. 6, row 58; `ORC-5C4EGUZSD2` |  |

### Phase equilibrium (18)

Table: Phase equilibrium, Ca–Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase assemblage |  | 673.15 | (Ca) + CaMg2 + Ca2Si; _alloy: Ca 0.6, Mg 0.3, Si 0.1_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 17; `ORC-MDKANU43VC` |  |
| Phase assemblage |  | 673.15 | (Mg) + Mg2Si + CaMgSi; _alloy: Ca 0.2, Mg 0.6, Si 0.2_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 14; `ORC-L4PXUIBHAW` |  |
| Phase assemblage |  | 673.15 | Ca2Si + CaMg2 + (Ca); _alloy: Ca 0.25, Mg 0.1, Si 0.65_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 13; `ORC-DO5RT5OI7I` |  |
| Phase assemblage |  | 673.15 | Ca5Si3 + Ca2Si + CaMgSi + Ca1.21Mg0.79Si; _alloy: Ca 0.35, Mg 0.1, Si 0.55_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 7; `ORC-SLODS66E5G` |  |
| Phase assemblage |  | 673.15 | Ca5Si3 + CaSi + CaMgSi; _alloy: Ca 0.5, Mg 0.17, Si 0.33_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 11; `ORC-67MQ6QSN5Q` |  |
| Phase assemblage |  | 673.15 | Ca5Si3 + CaSi + CaMgSi; _alloy: Ca 0.57, Mg 0.1, Si 0.33_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 12; `ORC-U7YAEDMHHQ` |  |
| Phase assemblage |  | 673.15 | Ca7Mg6Si14 + Si; _alloy: Ca 0.25, Mg 0.21, Si 0.54_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 3; `ORC-ESTS4IASAD` |  |
| Phase assemblage |  | 673.15 | CaMg2 + (Mg) + CaMgSi; _alloy: Ca 0.25, Mg 0.7, Si 0.05_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 18; `ORC-357XGMQJ3X` |  |
| Phase assemblage |  | 673.15 | CaMg2 + Ca2Si + CaMgSi; _alloy: Ca 0.34, Mg 0.5, Si 0.16_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 15; `ORC-UM76NZUBZS` |  |
| Phase assemblage |  | 673.15 | CaMg2 + Mg + CaMgSi; _alloy: Ca 0.1, Mg 0.8, Si 0.1_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 16; `ORC-ADZ34BQV3H` |  |
| Phase assemblage |  | 673.15 | CaMgSi + CaMg2 + Ca7Mg6Si14; _alloy: Ca 0.33, Mg 0.33, Si 0.33_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 9; `ORC-42SQSXUYID` |  |
| Phase assemblage |  | 673.15 | CaSi + Ca7Mg6Si14; _alloy: Ca 0.34, Mg 0.16, Si 0.5_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 4; `ORC-ETC4IPNSLF` |  |
| Phase assemblage |  | 673.15 | CaSi + CaMgSi; _alloy: Ca 0.42, Mg 0.25, Si 0.33_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 10; `ORC-SN2BMHJDF4` |  |
| Phase assemblage |  | 673.15 | CaSi + CaMgSi + Ca1.21Mg0.79Si; _alloy: Ca 0.45, Mg 0.1, Si 0.45_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 5; `ORC-TXPZS7IUAT` |  |
| Phase assemblage |  | 673.15 | CaSi + CaMgSi + Ca7Mg6Si14; _alloy: Ca 0.4, Mg 0.2, Si 0.4_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 6; `ORC-KKXUTWBXPP` |  |
| Phase assemblage |  | 673.15 | CaSi2 + Ca7Mg6Si14 + Ca3Si4 + CaSi; _alloy: Ca 0.35, Mg 0.1, Si 0.55_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 2; `ORC-FO63FRDD7C` |  |
| Phase assemblage |  | 673.15 | CaSi2 + Ca7Mg6Si14 + Si + Ca3Si4; _alloy: Ca 0.25, Mg 0.1, Si 0.65_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 1; `ORC-E3EZVNYYSE` |  |
| Phase assemblage |  | 673.15 | Mg2Si + CaMgSi + Ca7Mg6Si14; _alloy: Ca 0.19, Mg 0.48, Si 0.33_ | experimental | [1] Gröbner 2003 | Table 3, p. 5, row 8; `ORC-MDSKNNHRIT` |  |

### Crystal structure (13)

Table: Crystal structure, Ca–Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 1270.8 not_printed ± 0.5 | 1423.15 (\<) | τ2, Ca7Mg6Si14; _alloy: Mg 0.222222, Si 0.518519_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 5; `ORC-2TINEKNT6A.be137b` |  |
| Lattice a | 12.71 Å | 1423.15 (\<) | τ2, Ca7Mg6Si14; _alloy: Mg 0.222222, Si 0.518519_ | model | [1] Gröbner 2003; _cites Zmiy 1974_ | Table 4, p. 5, row 4; `ORC-I6QLEUHHLD.a6457f` |  |
| Lattice a | 748.1 not_printed | 1507.15 (\<) | τ1; _τ1, Ca1+δMg1-δSi CaMgSi: Mg 0.333_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 2; `ORC-NLY6LNB4WG.5a83f7` |  |
| Lattice a | 750.4 not_printed ± 0.5 | 1507.15 (\<) | τ1; _τ1, Ca1+δMg1-δSi CaMgSi: Mg 0.263_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 3; `ORC-V4LJNXXRUO.a1311c` |  |
| Lattice a | 7.48 Å | 1507.15 (\<) | τ1 | model | [1] Gröbner 2003; _cites Eisenman 1972_ | Table 4, p. 5, row 1; `ORC-Y2DMBBPMPG.f06673` |  |
| Lattice b | 445.2 not_printed ± 0.6 | 1507.15 (\<) | τ1; _τ1, Ca1+δMg1-δSi CaMgSi: Mg 0.333_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 2; `ORC-NLY6LNB4WG.24b5fa` |  |
| Lattice b | 445.2 not_printed ± 0.4 | 1507.15 (\<) | τ1; _τ1, Ca1+δMg1-δSi CaMgSi: Mg 0.263_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 3; `ORC-V4LJNXXRUO.63ab9c` |  |
| Lattice b | 4.4 Å | 1507.15 (\<) | τ1 | model | [1] Gröbner 2003; _cites Eisenman 1972_ | Table 4, p. 5, row 1; `ORC-Y2DMBBPMPG.dace56` |  |
| Lattice c | 438.8 not_printed ± 0.3 | 1423.15 (\<) | τ2, Ca7Mg6Si14; _alloy: Mg 0.222222, Si 0.518519_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 5; `ORC-2TINEKNT6A.1222e4` |  |
| Lattice c | 4.37 Å | 1423.15 (\<) | τ2, Ca7Mg6Si14; _alloy: Mg 0.222222, Si 0.518519_ | model | [1] Gröbner 2003; _cites Zmiy 1974_ | Table 4, p. 5, row 4; `ORC-I6QLEUHHLD.383c6c` |  |
| Lattice c | 829.7 not_printed ± 0.8 | 1507.15 (\<) | τ1; _τ1, Ca1+δMg1-δSi CaMgSi: Mg 0.333_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 2; `ORC-NLY6LNB4WG.c79bb4` |  |
| Lattice c | 837.1 not_printed ± 0.7 | 1507.15 (\<) | τ1; _τ1, Ca1+δMg1-δSi CaMgSi: Mg 0.263_ | experimental | [1] Gröbner 2003 | Table 4, p. 5, row 3; `ORC-V4LJNXXRUO.fa6174` |  |
| Lattice c | 8.29 Å | 1507.15 (\<) | τ1 | model | [1] Gröbner 2003; _cites Eisenman 1972_ | Table 4, p. 5, row 1; `ORC-Y2DMBBPMPG.8fa69f` |  |

### Other property (1)

Table: Other property, Ca–Mg–Si system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Other; _printed: fH_ | 305 kJ/kg | 1138.15 |  | model | [1] Gröbner 2003 | p. 4; `ORC-XVAGVOB6K2` | “A heat of fusion, fH=305 kJ/kg at 865 C was reported by \[27\], however for an alloy composition Ca15Mg35Si50 (at.%), which has a much lower Cacontent compared to Ca7Mg6Si14.” |

## Sources

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

1. Joachim Gröbner, Igor Chumak, Rainer Schmid-Fetzer, Experimental study of ternary Ca–Mg–Si phase equilibria and thermodynamic assessment of Ca–Si and Ca–Mg–Si systems, Intermetallics 11, 1065-1074 (2003). [doi:10.1016/j.intermet.2003.07.001](https://doi.org/10.1016/j.intermet.2003.07.001)

## 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 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_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/).