Cr–P phases

8 phases (tier A 3, tier C 2, liquid 1, needs_review 2); 5 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 · full JSON · Cr–P system page · Markdown · field reference

Phases of the Cr–P system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:cr-p:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2238.74 K, x(P) 0–0.0001	2
M2P_C22 phase:cr-p:c22-m2p	Fe2P · C22 · hP9 · P-62m (189)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1920.62 K, x(P) 0.33333–0.33333	2
M3P_D0E phase:cr-p:d0e-m3p	Ni3P · D0_e · tI32 · I-4 (82)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1784.51 K, x(P) 0.25–0.25	2
FCC_A1 phase:cr-p:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	2
HCP_A3 phase:cr-p:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	2
LIQUID phase:cr-p:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 300–4000 K, x(P) 0–1	2
RED_P phase:cr-p:p-red		needs_review	stable in 2 of 2 calculated diagram(s): 300–915 K, x(P) 1–1	2
WHITE_P phase:cr-p:p-white		needs_review	not stable in 2 calculated diagram(s)	2

BCC_A2 (Cr–P)

Id: phase:cr-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 2 of 2 calculated diagram(s): 300–2238.74 K, x(P) 0–0.0001
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:bcc-a2
tdb: tdb:CrP-14Mie.tdb:BCC_A2, tdb:CrP-99Mie-LB.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

CrP-14Mie.tdb: BCC_A2, type code %B, sha256 13fd479377120522…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CR% P : VA : !

CrP-99Mie-LB.tdb: BCC_A2, type code %B, sha256 372cae8e610e58d4…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : CR% P : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

M2P_C22 (Cr–P)

Id: phase:cr-p:c22-m2p; status assigned
Structure: Fe2P · C22 · hP9 · P-62m (189); type st:c22-fe2p-hp9; 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
Caveat: not certain from the name or DFT alone (unrecognised_name_tokens:M2P); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Cr 0.6667, P 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1920.62 K, x(P) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:c22-m2p
tdb: tdb:CrP-14Mie.tdb:M2P_C22, tdb:CrP-99Mie-LB.tdb:M2P_C22

TDB models of M2P_C22 (2): PHASE and CONSTITUENT statements as written

CrP-14Mie.tdb: M2P_C22, type code %, sha256 13fd479377120522…

59: PHASE M2P_C22 % 2 2 1 !
60: CONST M2P_C22 : CR : P : !

CrP-99Mie-LB.tdb: M2P_C22, type code %, sha256 372cae8e610e58d4…

61: PHASE M2P_C22 % 2 2 1 !
62: CONST M2P_C22 : CR : P : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

M3P_D0E (Cr–P)

Id: phase:cr-p:d0e-m3p; status assigned
Structure: Ni3P · D0_e · tI32 · I-4 (82); type st:d0-e-ni3p-ti32; 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
Caveat: DFT agrees: on-hull mp-aaaaalog and oqmd-4349, space group 82
Caveat: not certain from the name or DFT alone (unrecognised_name_tokens:M3P); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Cr 0.7500, P 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1784.51 K, x(P) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cr-p:d0e-m3p
mp: mp:mp-aaaaalog
oqmd: oqmd:oqmd-4349
tdb: tdb:CrP-14Mie.tdb:M3P_D0E, tdb:CrP-99Mie-LB.tdb:M3P_D0E

TDB models of M3P_D0E (2): PHASE and CONSTITUENT statements as written

CrP-14Mie.tdb: M3P_D0E, type code %, sha256 13fd479377120522…

53: PHASE M3P_D0E % 2 3 1 !
54: CONST M3P_D0E : CR : P : !

CrP-99Mie-LB.tdb: M3P_D0E, type code %, sha256 372cae8e610e58d4…

55: PHASE M3P_D0E % 2 3 1 !
56: CONST M3P_D0E : CR : P : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

FCC_A1 (Cr–P)

Id: phase:cr-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: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:fcc-a1
tdb: tdb:CrP-14Mie.tdb:FCC_A1, tdb:CrP-99Mie-LB.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

CrP-14Mie.tdb: FCC_A1, type code %A, sha256 13fd479377120522…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CR P : VA : !

CrP-99Mie-LB.tdb: FCC_A1, type code %A, sha256 372cae8e610e58d4…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : CR P : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

HCP_A3 (Cr–P)

Id: phase:cr-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: Cr 1.0000
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:hcp-a3
tdb: tdb:CrP-14Mie.tdb:HCP_A3, tdb:CrP-99Mie-LB.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

CrP-14Mie.tdb: HCP_A3, type code %A, sha256 13fd479377120522…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CR : VA : !

CrP-99Mie-LB.tdb: HCP_A3, type code %A, sha256 372cae8e610e58d4…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : CR : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

LIQUID (Cr–P)

Id: phase:cr-p:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–4000 K, x(P) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:liquid
tdb: tdb:CrP-14Mie.tdb:LIQUID, tdb:CrP-99Mie-LB.tdb:LIQUID

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

CrP-14Mie.tdb: LIQUID, type code %, sha256 13fd479377120522…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CR P : !

CrP-99Mie-LB.tdb: LIQUID, type code %, sha256 372cae8e610e58d4…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : CR P : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

RED_P (Cr–P)

Id: phase:cr-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 2 of 2 calculated diagram(s): 300–915 K, x(P) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:p-red
tdb: tdb:CrP-14Mie.tdb:RED_P, tdb:CrP-99Mie-LB.tdb:RED_P

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

CrP-14Mie.tdb: RED_P, type code %, sha256 13fd479377120522…

48: PHASE RED_P % 1 1 !
49: CONST RED_P : P : !

CrP-99Mie-LB.tdb: RED_P, type code %, sha256 372cae8e610e58d4…

50: PHASE RED_P % 1 1 !
51: CONST RED_P : P : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
assessment that models this phase

WHITE_P (Cr–P)

Id: phase:cr-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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:cr-p:p-white
tdb: tdb:CrP-14Mie.tdb:WHITE_P, tdb:CrP-99Mie-LB.tdb:WHITE_P

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

CrP-14Mie.tdb: WHITE_P, type code %, sha256 13fd479377120522…

43: PHASE WHITE_P % 1 1 !
44: CONST WHITE_P : P : !

CrP-99Mie-LB.tdb: WHITE_P, type code %, sha256 372cae8e610e58d4…

45: PHASE WHITE_P % 1 1 !
46: CONST WHITE_P : P : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-014-0314-x J. Miettinen, G. Vassilev, J. Phase Equilib. Diffus., 35, 458-68(2014).
assessment that models this phase
doi:10.1016/S0364-5916(99)00019-X J. Miettinen, Calphad, 23, 191-99(1999).
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). doi: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). doi: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.

@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}
}