Pr–Sb phases

11 phases (tier A 8, tier C 2, liquid 1); 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 · Pr–Sb system page · Markdown · field reference

Phases of the Pr–Sb system (11)
Phase	Structure	Basis	Stability (calculated)	TDB models
RHOMBOHEDRAL_A7 phase:pr-sb:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–903.78 K, x(Sb) 1–1	1
BCC_A2 phase:pr-sb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1053.29–1213.54 K, x(Sb) 0–0.00622	1
DHCP phase:pr-sb:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1127.04 K, x(Sb) 0–0	1
FCC_A1 phase:pr-sb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
HCP_A3 phase:pr-sb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
LIQUID phase:pr-sb:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 902.26–2500 K, x(Sb) 0–1	1
PR2SB phase:pr-sb:pr2sb	La2Sb · tI12 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1742.95 K, x(Sb) 0.33333–0.33333	1
PR4SB3_D73 phase:pr-sb:pr4sb3-d73	Th3P4 · D7_3 · cI28 · I-43d (220)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2107.27 K, x(Sb) 0.42857–0.42857	1
PR5SB3_D88 phase:pr-sb:pr5sb3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1943.04 K, x(Sb) 0.375–0.375	1
PRSB_B1 phase:pr-sb:prsb-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2433.47 K, x(Sb) 0.5–0.5	1
PRSB2 phase:pr-sb:prsb2	Sb2Sm · oC24 · Cmce (64)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1374.44 K, x(Sb) 0.66667–0.66667	1

RHOMBOHEDRAL_A7 (Pr–Sb)

Id: phase:pr-sb:a7-rhombohedral; status assigned
Structure: alpha-As · A7 · hR2 · R-3m (166); type st:a7-alpha-as-hr2; tier A: standard phase name; confidence high
Stoichiometry: Sb 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–903.78 K, x(Sb) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:a7-rhombohedral
tdb: tdb:PrSb-92Cac-LB.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: RHOMBOHEDRAL_A7, type code %, sha256 b9923dd02f3c54c7…

45: PHASE RHOMBOHEDRAL_A7 % 1 1 !
46: CONST RHOMBOHEDRAL_A7 : SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

BCC_A2 (Pr–Sb)

Id: phase:pr-sb: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 1 of 1 calculated diagram(s): 1053.29–1213.54 K, x(Sb) 0–0.00622
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:bcc-a2
tdb: tdb:PrSb-92Cac-LB.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: BCC_A2, type code %B, sha256 b9923dd02f3c54c7…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : PR% SB : VA : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

DHCP (Pr–Sb)

Id: phase:pr-sb:dhcp-a3; status assigned
Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type st:a3-alpha-la-hp4; tier A: standard phase name; confidence high
Stoichiometry: Pr 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1127.04 K, x(Sb) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:dhcp-a3
tdb: tdb:PrSb-92Cac-LB.tdb:DHCP

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

PrSb-92Cac-LB.tdb: DHCP, type code %A, sha256 b9923dd02f3c54c7…

40: PHASE DHCP %A 1 1 !
41: CONST DHCP : PR : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

FCC_A1 (Pr–Sb)

Id: phase:pr-sb:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Sb 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:fcc-a1
tdb: tdb:PrSb-92Cac-LB.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: FCC_A1, type code %A, sha256 b9923dd02f3c54c7…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : SB : VA : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

HCP_A3 (Pr–Sb)

Id: phase:pr-sb: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: Sb 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:hcp-a3
tdb: tdb:PrSb-92Cac-LB.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: HCP_A3, type code %A, sha256 b9923dd02f3c54c7…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : SB : VA : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

LIQUID (Pr–Sb)

Id: phase:pr-sb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 902.26–2500 K, x(Sb) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:liquid
tdb: tdb:PrSb-92Cac-LB.tdb:LIQUID

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

PrSb-92Cac-LB.tdb: LIQUID, type code %, sha256 b9923dd02f3c54c7…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : PR SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

PR2SB (Pr–Sb)

Id: phase:pr-sb:pr2sb; status assigned
Structure: La2Sb · tI12 · I4/mmm (139); type st:la2sb-ti12; 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 (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Pr 0.6667, Sb 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1742.95 K, x(Sb) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:pr2sb
tdb: tdb:PrSb-92Cac-LB.tdb:PR2SB

TDB models of PR2SB (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: PR2SB, type code %, sha256 b9923dd02f3c54c7…

50: PHASE PR2SB % 2 2 1 !
51: CONST PR2SB : PR : SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

PR4SB3_D73 (Pr–Sb)

Id: phase:pr-sb:pr4sb3-d73; status assigned
Structure: Th3P4 · D7_3 · cI28 · I-43d (220); type st:d7-3-th3p4-ci28; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaacfc and oqmd-30958, space group 220
Stoichiometry: Pr 0.5714, Sb 0.4286
Stability: stable in 1 of 1 calculated diagram(s): 300–2107.27 K, x(Sb) 0.42857–0.42857
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pr-sb:pr4sb3-d73
mp: mp:mp-aaaaacfc
oqmd: oqmd:oqmd-30958
tdb: tdb:PrSb-92Cac-LB.tdb:PR4SB3_D73

TDB models of PR4SB3_D73 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: PR4SB3_D73, type code %, sha256 b9923dd02f3c54c7…

60: PHASE PR4SB3_D73 % 2 4 3 !
61: CONST PR4SB3_D73 : PR : SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

PR5SB3_D88 (Pr–Sb)

Id: phase:pr-sb:pr5sb3-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacpstc and oqmd-30959, space group 193
Stoichiometry: Pr 0.6250, Sb 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–1943.04 K, x(Sb) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pr-sb:pr5sb3-d88
mp: mp:mp-aaacpstc
oqmd: oqmd:oqmd-30959
tdb: tdb:PrSb-92Cac-LB.tdb:PR5SB3_D88

TDB models of PR5SB3_D88 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: PR5SB3_D88, type code %, sha256 b9923dd02f3c54c7…

55: PHASE PR5SB3_D88 % 2 5 3 !
56: CONST PR5SB3_D88 : PR : SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

PRSB_B1 (Pr–Sb)

Id: phase:pr-sb:prsb-b1; status assigned
Structure: NaCl · B1 · cF8 · Fm-3m (225); type st:b1-nacl-cf8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaacqr and oqmd-14051, space group 225
Stoichiometry: Pr 0.5000, Sb 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–2433.47 K, x(Sb) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pr-sb:prsb-b1
mp: mp:mp-aaaaacqr
oqmd: oqmd:oqmd-14051
tdb: tdb:PrSb-92Cac-LB.tdb:PRSB_B1

TDB models of PRSB_B1 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: PRSB_B1, type code %, sha256 b9923dd02f3c54c7…

65: PHASE PRSB_B1 % 2 1 1 !
66: CONST PRSB_B1 : PR : SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
assessment that models this phase

PRSB2 (Pr–Sb)

Id: phase:pr-sb:prsb2; status assigned
Structure: Sb2Sm · oC24 · Cmce (64); type st:sb2sm-oc24; 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 (dft_space_group_64_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Pr 0.3333, Sb 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1374.44 K, x(Sb) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pr-sb:prsb2
tdb: tdb:PrSb-92Cac-LB.tdb:PRSB2

TDB models of PRSB2 (1): PHASE and CONSTITUENT statements as written

PrSb-92Cac-LB.tdb: PRSB2, type code %, sha256 b9923dd02f3c54c7…

70: PHASE PRSB2 % 2 1 2 !
71: CONST PRSB2 : PR : SB : !

Example references (1 of 1; assessments first):

doi:10.1515/ijmr-1992-830906 G. Cacciamani, R. Ferro, H.L. Lukas, Z. Metallkd., 83, 669-72(1992).
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}
}