Fe–P phases

11 phases (tier A 5, tier C 2, liquid 1, needs_review 3); 9 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 · Fe–P system page · Markdown · field reference

Phases of the Fe–P system (11)
PhaseStructureBasisStability (calculated)Literature valuesTDB models
BCC_A2
phase:fe-p:bcc-a2
W · A2 · cI2 · Im-3m (229)tier A: standard phase namestable in 4 of 4 calculated diagram(s): 300–1822.13 K, x(P) 0–0.0474304
M2P_C22
phase:fe-p:c22-m2p
Fe2P · C22 · hP9 · P-62m (189)tier C: assessor-stated (Hallstedt 2025 crystallographic table)stable in 4 of 4 calculated diagram(s): 300–1642.85 K, x(P) 0.33333–0.3333304
M3P_D0E
phase:fe-p:d0e-m3p
Ni3P · D0_e · tI32 · I-4 (82)tier C: assessor-stated (Hallstedt 2025 crystallographic table)stable in 4 of 4 calculated diagram(s): 300–1438.44 K, x(P) 0.25–0.2504
FCC_A1
phase:fe-p:fcc-a1
Cu · A1 · cF4 · Fm-3m (225)tier A: standard phase namestable in 4 of 4 calculated diagram(s): 1142.44–1689.83 K, x(P) 0–0.0087304
FEP_B31
phase:fe-p:fep-b31
MnP · B31 · oP8 · Pnma (62)tier A: standard phase namestable in 4 of 4 calculated diagram(s): 300–1723.14 K, x(P) 0.5–0.504
FEP2_C18
phase:fe-p:fep2-c18
alpha-FeS2 · C18 · oP6 · Pnnm (58)tier A: standard phase namestable in 1 of 1 calculated diagram(s): 300–1892.27 K, x(P) 0.66667–0.6666701
FEP4
phase:fe-p:fep4
needs_reviewstable in 1 of 1 calculated diagram(s): 300–1969.4 K, x(P) 0.8–0.801
HCP_A3
phase:fe-p:hcp-a3
Mg · A3 · hP2 · P6_3/mmc (194)tier A: standard phase namenot stable in 4 calculated diagram(s)04
LIQUID
phase:fe-p:liquid
liquidliquidstable in 4 of 4 calculated diagram(s): 610.64–2500 K, x(P) 0–104
RED_P
phase:fe-p:p-red
needs_reviewstable in 4 of 4 calculated diagram(s): 300–852.36 K, x(P) 1–104
WHITE_P
phase:fe-p:p-white
needs_reviewnot stable in 4 calculated diagram(s)04

BCC_A2 (Fe–P)

Names (5): corpus: corpus:phase:fe-p:bcc-a2
tdb: tdb:FeP-06Oht.tdb:BCC_A2, tdb:FeP-14Mie.tdb:BCC_A2, tdb:FeP-90Gus-LB.tdb:BCC_A2, tdb:FeP-96Shi.tdb:BCC_A2

TDB models of BCC_A2 (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: BCC_A2, type code %B, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: BCC_A2, type code %B, sha256 dd88469e10d0e159…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : FE% P : VA : !

FeP-90Gus-LB.tdb: BCC_A2, type code %B, sha256 fc41a6717da7517e…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : FE% P : VA : !

FeP-96Shi.tdb: BCC_A2, type code %B, sha256 24a34412d29b7eb0…

34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : FE% P : VA : !

Example references (2 of 2; assessments first):

M2P_C22 (Fe–P)

Names (5): corpus: corpus:phase:fe-p:c22-m2p
tdb: tdb:FeP-06Oht.tdb:M2P_C22, tdb:FeP-14Mie.tdb:M2P_C22, tdb:FeP-90Gus-LB.tdb:M2P_C22, tdb:FeP-96Shi.tdb:M2P_C22

TDB models of M2P_C22 (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: M2P_C22, type code %, sha256 eb48bb3f75bf74af…

58: PHASE M2P_C22 % 2 2 1 !
59: CONST M2P_C22 : FE : P : !

FeP-14Mie.tdb: M2P_C22, type code %, sha256 dd88469e10d0e159…

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

FeP-90Gus-LB.tdb: M2P_C22, type code %, sha256 fc41a6717da7517e…

65: PHASE M2P_C22 % 2 2 1 !
66: CONST M2P_C22 : FE : P : !

FeP-96Shi.tdb: M2P_C22, type code %, sha256 24a34412d29b7eb0…

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

Example references (2 of 2; assessments first):

M3P_D0E (Fe–P)

Names (7): corpus: corpus:phase:fe-p:d0e-m3p
mp: mp:mp-aaaabbro
oqmd: oqmd:oqmd-8062
tdb: tdb:FeP-06Oht.tdb:M3P_D0E, tdb:FeP-14Mie.tdb:M3P_D0E, tdb:FeP-90Gus-LB.tdb:M3P_D0E, tdb:FeP-96Shi.tdb:M3P_D0E

TDB models of M3P_D0E (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: M3P_D0E, type code %, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: M3P_D0E, type code %, sha256 dd88469e10d0e159…

54: PHASE M3P_D0E % 2 3 1 !
55: CONST M3P_D0E : FE : P : !

FeP-90Gus-LB.tdb: M3P_D0E, type code %, sha256 fc41a6717da7517e…

60: PHASE M3P_D0E % 2 3 1 !
61: CONST M3P_D0E : FE : P : !

FeP-96Shi.tdb: M3P_D0E, type code %, sha256 24a34412d29b7eb0…

54: PHASE M3P_D0E % 2 3 1 !
55: CONST M3P_D0E : FE : P : !

Example references (2 of 2; assessments first):

FCC_A1 (Fe–P)

Names (5): corpus: corpus:phase:fe-p:fcc-a1
tdb: tdb:FeP-06Oht.tdb:FCC_A1, tdb:FeP-14Mie.tdb:FCC_A1, tdb:FeP-90Gus-LB.tdb:FCC_A1, tdb:FeP-96Shi.tdb:FCC_A1

TDB models of FCC_A1 (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: FCC_A1, type code %A, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: FCC_A1, type code %A, sha256 dd88469e10d0e159…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : FE% P : VA : !

FeP-90Gus-LB.tdb: FCC_A1, type code %A, sha256 fc41a6717da7517e…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : FE% P : VA : !

FeP-96Shi.tdb: FCC_A1, type code %A, sha256 24a34412d29b7eb0…

29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : FE% P : VA : !

Example references (2 of 2; assessments first):

FEP_B31 (Fe–P)

Names (7): corpus: corpus:phase:fe-p:fep-b31
mp: mp:mp-aaaaabmr
oqmd: oqmd:oqmd-8020
tdb: tdb:FeP-06Oht.tdb:FEP_B31, tdb:FeP-14Mie.tdb:FEP_B31, tdb:FeP-90Gus-LB.tdb:FEP_B31, tdb:FeP-96Shi.tdb:FEP_B31

TDB models of FEP_B31 (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: FEP_B31, type code %, sha256 eb48bb3f75bf74af…

63: PHASE FEP_B31 % 2 1 1 !
64: CONST FEP_B31 : FE : P : !

FeP-14Mie.tdb: FEP_B31, type code %, sha256 dd88469e10d0e159…

64: PHASE FEP_B31 % 2 1 1 !
65: CONST FEP_B31 : FE : P : !

FeP-90Gus-LB.tdb: FEP_B31, type code %, sha256 fc41a6717da7517e…

70: PHASE FEP_B31 % 2 1 1 !
71: CONST FEP_B31 : FE : P : !

FeP-96Shi.tdb: FEP_B31, type code %, sha256 24a34412d29b7eb0…

64: PHASE FEP_B31 % 2 1 1 !
65: CONST FEP_B31 : FE : P : !

Example references (2 of 2; assessments first):

FEP2_C18 (Fe–P)

Names (4): corpus: corpus:phase:fe-p:fep2-c18
mp: mp:mp-aaaabdqh
oqmd: oqmd:oqmd-2958
tdb: tdb:FeP-06Oht.tdb:FEP2_C18

TDB models of FEP2_C18 (1): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: FEP2_C18, type code %, sha256 eb48bb3f75bf74af…

68: PHASE FEP2_C18 % 2 1 2 !
69: CONST FEP2_C18 : FE : P : !

Example references (1 of 1; assessments first):

FEP4 (Fe–P)

Names (2): corpus: corpus:phase:fe-p:fep4
tdb: tdb:FeP-06Oht.tdb:FEP4

TDB models of FEP4 (1): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: FEP4, type code %, sha256 eb48bb3f75bf74af…

73: PHASE FEP4 % 2 1 4 !
74: CONST FEP4 : FE : P : !

Example references (1 of 1; assessments first):

HCP_A3 (Fe–P)

Names (5): corpus: corpus:phase:fe-p:hcp-a3
tdb: tdb:FeP-06Oht.tdb:HCP_A3, tdb:FeP-14Mie.tdb:HCP_A3, tdb:FeP-90Gus-LB.tdb:HCP_A3, tdb:FeP-96Shi.tdb:HCP_A3

TDB models of HCP_A3 (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: HCP_A3, type code %A, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: HCP_A3, type code %A, sha256 dd88469e10d0e159…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : FE : VA : !

FeP-90Gus-LB.tdb: HCP_A3, type code %A, sha256 fc41a6717da7517e…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : FE : VA : !

FeP-96Shi.tdb: HCP_A3, type code %A, sha256 24a34412d29b7eb0…

39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : FE : VA : !

Example references (2 of 2; assessments first):

LIQUID (Fe–P)

Names (5): corpus: corpus:phase:fe-p:liquid
tdb: tdb:FeP-06Oht.tdb:LIQUID, tdb:FeP-14Mie.tdb:LIQUID, tdb:FeP-90Gus-LB.tdb:LIQUID, tdb:FeP-96Shi.tdb:LIQUID

TDB models of LIQUID (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: LIQUID, type code %, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: LIQUID, type code %, sha256 dd88469e10d0e159…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : FE P : !

FeP-90Gus-LB.tdb: LIQUID, type code %, sha256 fc41a6717da7517e…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : FE P : !

FeP-96Shi.tdb: LIQUID, type code %, sha256 24a34412d29b7eb0…

24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : FE P : !

Example references (2 of 2; assessments first):

RED_P (Fe–P)

Names (5): corpus: corpus:phase:fe-p:p-red
tdb: tdb:FeP-06Oht.tdb:RED_P, tdb:FeP-14Mie.tdb:RED_P, tdb:FeP-90Gus-LB.tdb:RED_P, tdb:FeP-96Shi.tdb:RED_P

TDB models of RED_P (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: RED_P, type code %, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: RED_P, type code %, sha256 dd88469e10d0e159…

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

FeP-90Gus-LB.tdb: RED_P, type code %, sha256 fc41a6717da7517e…

55: PHASE RED_P % 1 1 !
56: CONST RED_P : P : !

FeP-96Shi.tdb: RED_P, type code %, sha256 24a34412d29b7eb0…

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

Example references (2 of 2; assessments first):

WHITE_P (Fe–P)

Names (5): corpus: corpus:phase:fe-p:p-white
tdb: tdb:FeP-06Oht.tdb:WHITE_P, tdb:FeP-14Mie.tdb:WHITE_P, tdb:FeP-90Gus-LB.tdb:WHITE_P, tdb:FeP-96Shi.tdb:WHITE_P

TDB models of WHITE_P (4): PHASE and CONSTITUENT statements as written

FeP-06Oht.tdb: WHITE_P, type code %, sha256 eb48bb3f75bf74af…

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

FeP-14Mie.tdb: WHITE_P, type code %, sha256 dd88469e10d0e159…

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

FeP-90Gus-LB.tdb: WHITE_P, type code %, sha256 fc41a6717da7517e…

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

FeP-96Shi.tdb: WHITE_P, type code %, sha256 24a34412d29b7eb0…

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

Example references (2 of 2; assessments first):