# Mn–P phases

> Mn–P system: 13 phases (tier A 8, tier C 1, liquid 1, needs_review 3); 11 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

HTML: https://data.orchid-project.org/phases/pages/MN-P.html · Markdown: https://data.orchid-project.org/phases/pages/MN-P.md

13 phases (tier A 8, tier C 1, liquid 1, needs_review 3); 11 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: [interactive registry](https://orchid-project.org/phases/?q=MN-P) · [full JSON](https://data.orchid-project.org/phases/systems/MN-P.json) · [Mn–P system page](https://data.orchid-project.org/systems/MN-P.html) · [Markdown](https://data.orchid-project.org/phases/pages/MN-P.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Mn–P system (13)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-mn-p-bcc-a2); _phase:mn-p:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 1361.07–1580.39 K, x(P) 0–1e-05 | 0 | 3 |
| [CBCC_A12](#phase-mn-p-cbcc-a12); _phase:mn-p:cbcc-a12_ | alpha-Mn · A12 · cI58 · I-43m (217) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–980 K, x(P) 0–0 | 0 | 3 |
| [CUB_A13](#phase-mn-p-cub-a13); _phase:mn-p:cub-a13_ | beta-Mn · A13 · cP20 · P4_132 (213) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 980–1389.96 K, x(P) 0–1e-05 | 0 | 3 |
| [FCC_A1](#phase-mn-p-fcc-a1); _phase:mn-p:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 1359.96–1411.08 K, x(P) 0–2e-05 | 0 | 3 |
| [HCP_A3](#phase-mn-p-hcp-a3); _phase:mn-p:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 3 calculated diagram(s) | 0 | 3 |
| [LIQUID](#phase-mn-p-liquid); _phase:mn-p:liquid_ | liquid | liquid | stable in 3 of 3 calculated diagram(s): 300–2500 K, x(P) 0–1 | 0 | 3 |
| [MN2P_C22](#phase-mn-p-mn2p-c22); _phase:mn-p:mn2p-c22_ | Fe2P · C22 · hP9 · P-62m (189) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–1600.97 K, x(P) 0.33333–0.33333 | 0 | 3 |
| [MN3P_D0E](#phase-mn-p-mn3p-d0e); _phase:mn-p:mn3p-d0e_ | Ni3P · D0_e · tI32 · I-4 (82) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–1382.51 K, x(P) 0.25–0.25 | 0 | 3 |
| [MN3P2](#phase-mn-p-mn3p2); _phase:mn-p:mn3p2_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 1259.74–1367.15 K, x(P) 0.4–0.4 | 0 | 2 |
| [MNP_B31](#phase-mn-p-mnp-b31); _phase:mn-p:mnp-b31_ | MnP · B31 · oP8 · Pnma (62) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1428.47 K, x(P) 0.5–0.5 | 0 | 2 |
| [MNP4](#phase-mn-p-mnp4); _phase:mn-p:mnp4_ | MnP4 · aP10 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1559.87 K, x(P) 0.8–0.8 | 0 | 1 |
| [RED_P](#phase-mn-p-p-red); _phase:mn-p:p-red_ |  | needs_review | stable in 3 of 3 calculated diagram(s): 300–915 K, x(P) 1–1 | 0 | 3 |
| [WHITE_P](#phase-mn-p-p-white); _phase:mn-p:p-white_ |  | needs_review | not stable in 3 calculated diagram(s) | 0 | 3 |

## BCC_A2 (Mn–P)

- Id: `phase:mn-p:bcc-a2`; status `assigned`
- Structure: W · A2 · cI2 · Im-3m (229); type `st:a2-w-ci2`; tier A: standard phase name; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 1361.07–1580.39 K, x(P) 0–1e-05
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:bcc-a2)

Names (4): _corpus: _corpus:phase:mn-p:bcc-a2  
_tdb: _tdb:MnP-01Mie.tdb:BCC_A2, tdb:MnP-07Tok.tdb:BCC_A2, tdb:MnP-14Mie.tdb:BCC_A2  


### TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): BCC_A2, type code %B, sha256 `10848464fabd372b…`

~~~~text
32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : MN P : VA : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): BCC_A2, type code %B, sha256 `a557a0b4c71cfda4…`

~~~~text
33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : MN P : VA : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): BCC_A2, type code %B, sha256 `26ad7901d51552be…`

~~~~text
34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : MN P : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## CBCC_A12 (Mn–P)

- Id: `phase:mn-p:cbcc-a12`; status `assigned`
- Structure: alpha-Mn · A12 · cI58 · I-43m (217); type `st:a12-alpha-mn-ci58`; tier A: standard phase name; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 300–980 K, x(P) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:cbcc-a12)

Names (4): _corpus: _corpus:phase:mn-p:cbcc-a12  
_tdb: _tdb:MnP-01Mie.tdb:CBCC_A12, tdb:MnP-07Tok.tdb:CBCC_A12, tdb:MnP-14Mie.tdb:CBCC_A12  


### TDB models of CBCC_A12 (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): CBCC_A12, type code %A, sha256 `10848464fabd372b…`

~~~~text
42: PHASE CBCC_A12 %A 2 1 1 !
43: CONST CBCC_A12 : MN P : VA : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): CBCC_A12, type code %A, sha256 `a557a0b4c71cfda4…`

~~~~text
43: PHASE CBCC_A12 %A 2 1 1 !
44: CONST CBCC_A12 : MN P : VA : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): CBCC_A12, type code %A, sha256 `26ad7901d51552be…`

~~~~text
44: PHASE CBCC_A12 %A 2 1 1 !
45: CONST CBCC_A12 : MN P : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## CUB_A13 (Mn–P)

- Id: `phase:mn-p:cub-a13`; status `assigned`
- Structure: beta-Mn · A13 · cP20 · P4_132 (213); type `st:a13-beta-mn-cp20`; tier A: standard phase name; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 980–1389.96 K, x(P) 0–1e-05
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:cub-a13)

Names (4): _corpus: _corpus:phase:mn-p:cub-a13  
_tdb: _tdb:MnP-01Mie.tdb:CUB_A13, tdb:MnP-07Tok.tdb:CUB_A13, tdb:MnP-14Mie.tdb:CUB_A13  


### TDB models of CUB_A13 (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): CUB_A13, type code %, sha256 `10848464fabd372b…`

~~~~text
47: PHASE CUB_A13 % 2 1 1 !
48: CONST CUB_A13 : MN P : VA : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): CUB_A13, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
48: PHASE CUB_A13 % 2 1 1 !
49: CONST CUB_A13 : MN P : VA : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): CUB_A13, type code %, sha256 `26ad7901d51552be…`

~~~~text
49: PHASE CUB_A13 % 2 1 1 !
50: CONST CUB_A13 : MN P : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## FCC_A1 (Mn–P)

- Id: `phase:mn-p:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 1359.96–1411.08 K, x(P) 0–2e-05
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:fcc-a1)

Names (4): _corpus: _corpus:phase:mn-p:fcc-a1  
_tdb: _tdb:MnP-01Mie.tdb:FCC_A1, tdb:MnP-07Tok.tdb:FCC_A1, tdb:MnP-14Mie.tdb:FCC_A1  


### TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): FCC_A1, type code %A, sha256 `10848464fabd372b…`

~~~~text
27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : MN P : VA : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): FCC_A1, type code %A, sha256 `a557a0b4c71cfda4…`

~~~~text
28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : MN P : VA : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): FCC_A1, type code %A, sha256 `26ad7901d51552be…`

~~~~text
29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : MN P : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## HCP_A3 (Mn–P)

- Id: `phase:mn-p:hcp-a3`; status `assigned`
- Structure: Mg · A3 · hP2 · P6_3/mmc (194); type `st:a3-mg-hp2`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 1.0000
- Stability: not stable in 3 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:hcp-a3)

Names (4): _corpus: _corpus:phase:mn-p:hcp-a3  
_tdb: _tdb:MnP-01Mie.tdb:HCP_A3, tdb:MnP-07Tok.tdb:HCP_A3, tdb:MnP-14Mie.tdb:HCP_A3  


### TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): HCP_A3, type code %A, sha256 `10848464fabd372b…`

~~~~text
37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : MN : VA : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): HCP_A3, type code %A, sha256 `a557a0b4c71cfda4…`

~~~~text
38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : MN : VA : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): HCP_A3, type code %A, sha256 `26ad7901d51552be…`

~~~~text
39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : MN : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## LIQUID (Mn–P)

- Id: `phase:mn-p:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 3 of 3 calculated diagram(s): 300–2500 K, x(P) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:liquid)

Names (4): _corpus: _corpus:phase:mn-p:liquid  
_tdb: _tdb:MnP-01Mie.tdb:LIQUID, tdb:MnP-07Tok.tdb:LIQUID, tdb:MnP-14Mie.tdb:LIQUID  


### TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): LIQUID, type code %, sha256 `10848464fabd372b…`

~~~~text
22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : MN P : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): LIQUID, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : MN P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): LIQUID, type code %, sha256 `26ad7901d51552be…`

~~~~text
24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : MN P : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## MN2P_C22 (Mn–P)

- Id: `phase:mn-p:mn2p-c22`; status `assigned`
- Structure: Fe2P · C22 · hP9 · P-62m (189); type `st:c22-fe2p-hp9`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 0.6667, P 0.3333
- Stability: stable in 3 of 3 calculated diagram(s): 300–1600.97 K, x(P) 0.33333–0.33333
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:mn2p-c22)

Names (4): _corpus: _corpus:phase:mn-p:mn2p-c22  
_tdb: _tdb:MnP-01Mie.tdb:MN2P_C22, tdb:MnP-07Tok.tdb:MN2P_C22, tdb:MnP-14Mie.tdb:MN2P_C22  


### TDB models of MN2P_C22 (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): MN2P_C22, type code %, sha256 `10848464fabd372b…`

~~~~text
67: PHASE MN2P_C22 % 2 2 1 !
68: CONST MN2P_C22 : MN : P : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): MN2P_C22, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
68: PHASE MN2P_C22 % 2 2 1 !
69: CONST MN2P_C22 : MN : P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): MN2P_C22, type code %, sha256 `26ad7901d51552be…`

~~~~text
69: PHASE MN2P_C22 % 2 2 1 !
70: CONST MN2P_C22 : MN : P : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## MN3P_D0E (Mn–P)

- Id: `phase:mn-p:mn3p-d0e`; status `assigned`
- Structure: Ni3P · D0_e · tI32 · I-4 (82); type `st:d0-e-ni3p-ti32`; tier A: standard phase name; confidence high
- Stoichiometry: Mn 0.7500, P 0.2500
- Stability: stable in 3 of 3 calculated diagram(s): 300–1382.51 K, x(P) 0.25–0.25
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:mn3p-d0e)

Names (4): _corpus: _corpus:phase:mn-p:mn3p-d0e  
_tdb: _tdb:MnP-01Mie.tdb:MN3P_D0E, tdb:MnP-07Tok.tdb:MN3P_D0E, tdb:MnP-14Mie.tdb:MN3P_D0E  


### TDB models of MN3P_D0E (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): MN3P_D0E, type code %, sha256 `10848464fabd372b…`

~~~~text
62: PHASE MN3P_D0E % 2 3 1 !
63: CONST MN3P_D0E : MN : P : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): MN3P_D0E, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
63: PHASE MN3P_D0E % 2 3 1 !
64: CONST MN3P_D0E : MN : P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): MN3P_D0E, type code %, sha256 `26ad7901d51552be…`

~~~~text
64: PHASE MN3P_D0E % 2 3 1 !
65: CONST MN3P_D0E : MN : P : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## MN3P2 (Mn–P)

- Id: `phase:mn-p:mn3p2`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (Mn3P2) — Hallstedt 2025 mmc2 row for MN3P2: Mn3P2
- Stoichiometry: Mn 0.6000, P 0.4000
- Stability: stable in 2 of 2 calculated diagram(s): 1259.74–1367.15 K, x(P) 0.4–0.4
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:mn3p2)

Names (3): _corpus: _corpus:phase:mn-p:mn3p2  
_tdb: _tdb:MnP-07Tok.tdb:MN3P2, tdb:MnP-14Mie.tdb:MN3P2  


### TDB models of MN3P2 (2): PHASE and CONSTITUENT statements as written

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): MN3P2, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
73: PHASE MN3P2 % 2 3 2 !
74: CONST MN3P2 : MN : P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): MN3P2, type code %, sha256 `26ad7901d51552be…`

~~~~text
74: PHASE MN3P2 % 2 3 2 !
75: CONST MN3P2 : MN : P : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_

## MNP_B31 (Mn–P)

- Id: `phase:mn-p:mnp-b31`; status `assigned`
- Structure: MnP · B31 · oP8 · Pnma (62); type `st:b31-mnp-op8`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaadyk and oqmd-5845, space group 62
- Stoichiometry: Mn 0.5000, P 0.5000
- Stability: stable in 2 of 2 calculated diagram(s): 300–1428.47 K, x(P) 0.5–0.5
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:mnp-b31)

Names (5): _corpus: _corpus:phase:mn-p:mnp-b31  
_mp: _mp:mp-aaaaadyk  
_oqmd: _oqmd:oqmd-5845  
_tdb: _tdb:MnP-07Tok.tdb:MNP_B31, tdb:MnP-14Mie.tdb:MNP_B31  


### TDB models of MNP_B31 (2): PHASE and CONSTITUENT statements as written

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): MNP_B31, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
78: PHASE MNP_B31 % 2 1 1 !
79: CONST MNP_B31 : MN : P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): MNP_B31, type code %, sha256 `26ad7901d51552be…`

~~~~text
79: PHASE MNP_B31 % 2 1 1 !
80: CONST MNP_B31 : MN : P : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_

## MNP4 (Mn–P)

- Id: `phase:mn-p:mnp4`; status `assigned`
- Structure: MnP4 · aP10 · P-1 (2); type `st:mnp4-ap10`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (dft_space_group_2_matches_0_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Mn 0.2000, P 0.8000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1559.87 K, x(P) 0.8–0.8
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:mnp4)

Names (2): _corpus: _corpus:phase:mn-p:mnp4  
_tdb: _tdb:MnP-07Tok.tdb:MNP4  


### TDB models of MNP4 (1): PHASE and CONSTITUENT statements as written

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): MNP4, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
83: PHASE MNP4 % 2 1 4 !
84: CONST MNP4 : MN : P : !
~~~~

## RED_P (Mn–P)

- Id: `phase:mn-p:p-red`; status `needs_review`
- No structure assigned. Why: name_has_descriptive_tokens:RED; no_structure_token
- Candidate (sgte_mmc2): (Red P) — Hallstedt 2025 mmc2 row for RED_P: Red P
- Stoichiometry: P 1.0000
- Stability: stable in 3 of 3 calculated diagram(s): 300–915 K, x(P) 1–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:p-red)

Names (4): _corpus: _corpus:phase:mn-p:p-red  
_tdb: _tdb:MnP-01Mie.tdb:RED_P, tdb:MnP-07Tok.tdb:RED_P, tdb:MnP-14Mie.tdb:RED_P  


### TDB models of RED_P (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): RED_P, type code %, sha256 `10848464fabd372b…`

~~~~text
57: PHASE RED_P % 1 1 !
58: CONST RED_P : P : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): RED_P, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
58: PHASE RED_P % 1 1 !
59: CONST RED_P : P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): RED_P, type code %, sha256 `26ad7901d51552be…`

~~~~text
59: PHASE RED_P % 1 1 !
60: CONST RED_P : P : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## WHITE_P (Mn–P)

- Id: `phase:mn-p:p-white`; status `needs_review`
- No structure assigned. Why: name_has_descriptive_tokens:WHITE; no_structure_token
- Candidate (sgte_mmc2): (White P) — Hallstedt 2025 mmc2 row for WHITE_P: White P
- Stoichiometry: P 1.0000
- Stability: not stable in 3 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mn-p:p-white)

Names (4): _corpus: _corpus:phase:mn-p:p-white  
_tdb: _tdb:MnP-01Mie.tdb:WHITE_P, tdb:MnP-07Tok.tdb:WHITE_P, tdb:MnP-14Mie.tdb:WHITE_P  


### TDB models of WHITE_P (3): PHASE and CONSTITUENT statements as written

[MnP-01Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-01Mie.tdb): WHITE_P, type code %, sha256 `10848464fabd372b…`

~~~~text
52: PHASE WHITE_P % 1 1 !
53: CONST WHITE_P : P : !
~~~~

[MnP-07Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-07Tok.tdb): WHITE_P, type code %, sha256 `a557a0b4c71cfda4…`

~~~~text
53: PHASE WHITE_P % 1 1 !
54: CONST WHITE_P : P : !
~~~~

[MnP-14Mie.tdb](https://orchid-project.org/data/databases/sgte-binary/MnP-14Mie.tdb): WHITE_P, type code %, sha256 `26ad7901d51552be…`

~~~~text
54: PHASE WHITE_P % 1 1 !
55: CONST WHITE_P : P : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1007/s11669-014-0328-4](https://doi.org/10.1007/s11669-014-0328-4) Jyrki Miettinen, Gueorgui Vassilev, Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P, J. Phase Equilib. Diffus. 35, 587-594 (2014).  
_assessment that models this phase_
- [doi:10.1016/S0364-5916(01)00029-3](https://doi.org/10.1016/S0364-5916%2801%2900029-3) J. Miettinen, Calphad, 25, 43-58(2001).  
_assessment that models this phase_

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735970
- 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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work).

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_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  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 the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).