Dy–Si phases

13 phases (tier A 7, tier C 3, liquid 1, needs_review 2); 12 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 · Dy–Si system page · Markdown · field reference

Phases of the Dy–Si system (13)
Phase	Structure	Basis	Stability (calculated)	TDB models
DIAMOND_A4 phase:dy-si:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1687 K, x(Si) 1–1	1
BCC_A2 phase:dy-si:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1654.15–1680 K, x(Si) 0–0	1
DY3SI4 phase:dy-si:dy3si4	Ho3Si4 · oC24 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1623.02 K, x(Si) 0.57143–0.57143	1
DY3SI5_BETA phase:dy-si:dy3si5-beta		needs_review	stable in 1 of 1 calculated diagram(s): 1032.97–1903.47 K, x(Si) 0.625–0.625	1
DY3SI5_C32 phase:dy-si:dy3si5-c32		needs_review	stable in 1 of 1 calculated diagram(s): 300–1032.97 K, x(Si) 0.625–0.625	1
DY5SI3_D88 phase:dy-si:dy5si3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2144.22 K, x(Si) 0.375–0.375	1
DY5SI4 phase:dy-si:dy5si4	Gd5Si4 · oP36 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2100.87 K, x(Si) 0.44444–0.44444	1
DYSI_B33 phase:dy-si:dysi-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2150.72 K, x(Si) 0.5–0.5	1
DYSI2_ALPHA phase:dy-si:dysi2-alpha	GdSi1.4 · oI12 · Imma (74)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–763.07 K, x(Si) 0.66667–0.66667	1
DYSI2_CC phase:dy-si:dysi2-cc	Si2Th · C_c · tI12 · I4_1/amd (141)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 763.07–1709.93 K, x(Si) 0.66667–0.66667	1
FCC_A1 phase:dy-si:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
HCP_A3 phase:dy-si:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1679.15 K, x(Si) 0–0	1
LIQUID phase:dy-si:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1439.05–2500 K, x(Si) 0–1	1

DIAMOND_A4 (Dy–Si)

Id: phase:dy-si:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Si 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1687 K, x(Si) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:a4-diamond
tdb: tdb:DySi-20Xu.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DIAMOND_A4, type code %, sha256 fc1df6d524cf6b9f…

40: PHASE DIAMOND_A4 % 1 1 !
41: CONST DIAMOND_A4 : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

BCC_A2 (Dy–Si)

Id: phase:dy-si: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): 1654.15–1680 K, x(Si) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:bcc-a2
tdb: tdb:DySi-20Xu.tdb:BCC_A2

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

DySi-20Xu.tdb: BCC_A2, type code %B, sha256 fc1df6d524cf6b9f…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : DY% SI : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DY3SI4 (Dy–Si)

Id: phase:dy-si:dy3si4; status assigned
Structure: Ho3Si4 · oC24 · Cmcm (63); type st:ho3si4-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 (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Dy 0.4286, Si 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–1623.02 K, x(Si) 0.57143–0.57143
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dy3si4
tdb: tdb:DySi-20Xu.tdb:DY3SI4

TDB models of DY3SI4 (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DY3SI4, type code %, sha256 fc1df6d524cf6b9f…

61: PHASE DY3SI4 % 2 3 4 !
62: CONST DY3SI4 : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DY3SI5_BETA (Dy–Si)

Id: phase:dy-si:dy3si5-beta; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Dy3Si5-beta) — Hallstedt 2025 mmc2 row for DY3SI5_BETA: Dy3Si5 (high T)
Stoichiometry: Dy 0.3750, Si 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 1032.97–1903.47 K, x(Si) 0.625–0.625
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dy3si5-beta
tdb: tdb:DySi-20Xu.tdb:DY3SI5_BETA

TDB models of DY3SI5_BETA (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DY3SI5_BETA, type code %, sha256 fc1df6d524cf6b9f…

71: PHASE DY3SI5_BETA % 2 3 5 !
72: CONST DY3SI5_BETA : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DY3SI5_C32 (Dy–Si)

Id: phase:dy-si:dy3si5-c32; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C32; stoichiometry_contradicts_C32:DySi-20Xu.tdb
Candidate (name_token): AlB2 · C32 · hP3 · P6/mmm (191) — Strukturbericht/word 'C32' in the TDB name
Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for DY3SI5_C32: Dy3Si5 (low T)
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — DySi-20Xu.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Stoichiometry: Dy 0.3750, Si 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–1032.97 K, x(Si) 0.625–0.625
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dy3si5-c32
tdb: tdb:DySi-20Xu.tdb:DY3SI5_C32

TDB models of DY3SI5_C32 (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DY3SI5_C32, type code %, sha256 fc1df6d524cf6b9f…

66: PHASE DY3SI5_C32 % 2 3 5 !
67: CONST DY3SI5_C32 : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DY5SI3_D88 (Dy–Si)

Id: phase:dy-si:dy5si3-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-aaaaaefc and oqmd-651409, space group 193
Stoichiometry: Dy 0.6250, Si 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–2144.22 K, x(Si) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:dy-si:dy5si3-d88
mp: mp:mp-aaaaaefc
oqmd: oqmd:oqmd-651409
tdb: tdb:DySi-20Xu.tdb:DY5SI3_D88

TDB models of DY5SI3_D88 (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DY5SI3_D88, type code %, sha256 fc1df6d524cf6b9f…

45: PHASE DY5SI3_D88 % 2 5 3 !
46: CONST DY5SI3_D88 : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DY5SI4 (Dy–Si)

Id: phase:dy-si:dy5si4; status assigned
Structure: Gd5Si4 · oP36 · Pnma (62); type st:gd5si4-op36; 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: Dy 0.5556, Si 0.4444
Stability: stable in 1 of 1 calculated diagram(s): 300–2100.87 K, x(Si) 0.44444–0.44444
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dy5si4
tdb: tdb:DySi-20Xu.tdb:DY5SI4

TDB models of DY5SI4 (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DY5SI4, type code %, sha256 fc1df6d524cf6b9f…

50: PHASE DY5SI4 % 2 5 4 !
51: CONST DY5SI4 : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DYSI_B33 (Dy–Si)

Id: phase:dy-si:dysi-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Stoichiometry: Dy 0.5000, Si 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–2150.72 K, x(Si) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dysi-b33
tdb: tdb:DySi-20Xu.tdb:DYSI_B33

TDB models of DYSI_B33 (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DYSI_B33, type code %, sha256 fc1df6d524cf6b9f…

56: PHASE DYSI_B33 % 2 1 1 !
57: CONST DYSI_B33 : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DYSI2_ALPHA (Dy–Si)

Id: phase:dy-si:dysi2-alpha; status assigned
Structure: GdSi1.4 · oI12 · Imma (74); type st:gdsi1-4-oi12; 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_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Dy 0.3333, Si 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–763.07 K, x(Si) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dysi2-alpha
tdb: tdb:DySi-20Xu.tdb:DYSI2_ALPHA

TDB models of DYSI2_ALPHA (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DYSI2_ALPHA, type code %, sha256 fc1df6d524cf6b9f…

76: PHASE DYSI2_ALPHA % 2 1 2 !
77: CONST DYSI2_ALPHA : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

DYSI2_CC (Dy–Si)

Id: phase:dy-si:dysi2-cc; status assigned
Structure: Si2Th · C_c · tI12 · I4_1/amd (141); type st:c-c-si2th-ti12; tier A: standard phase name; confidence high
Stoichiometry: Dy 0.3333, Si 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 763.07–1709.93 K, x(Si) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:dysi2-cc
tdb: tdb:DySi-20Xu.tdb:DYSI2_CC

TDB models of DYSI2_CC (1): PHASE and CONSTITUENT statements as written

DySi-20Xu.tdb: DYSI2_CC, type code %, sha256 fc1df6d524cf6b9f…

81: PHASE DYSI2_CC % 2 1 2 !
82: CONST DYSI2_CC : DY : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

FCC_A1 (Dy–Si)

Id: phase:dy-si: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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:fcc-a1
tdb: tdb:DySi-20Xu.tdb:FCC_A1

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

DySi-20Xu.tdb: FCC_A1, type code %A, sha256 fc1df6d524cf6b9f…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

HCP_A3 (Dy–Si)

Id: phase:dy-si:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1679.15 K, x(Si) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:hcp-a3
tdb: tdb:DySi-20Xu.tdb:HCP_A3

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

DySi-20Xu.tdb: HCP_A3, type code %A, sha256 fc1df6d524cf6b9f…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
assessment that models this phase

LIQUID (Dy–Si)

Id: phase:dy-si:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1439.05–2500 K, x(Si) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:dy-si:liquid
tdb: tdb:DySi-20Xu.tdb:LIQUID

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

DySi-20Xu.tdb: LIQUID, type code %, sha256 fc1df6d524cf6b9f…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : DY SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101738 K. Xu, L. Chen, K. Chang, P. Wan, M. Li, Z. Deng, F. Huang, Q. Huang, Calphad, 68, 101738(2020).
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}
}