# Cu–Dy phases
> Cu–Dy system: 12 phases (tier A 6, tier C 2, liquid 1, needs_review 3); 12 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/CU-DY.html · Markdown: https://data.orchid-project.org/phases/pages/CU-DY.md
12 phases (tier A 6, tier C 2, liquid 1, needs_review 3); 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](https://orchid-project.org/phases/?q=CU-DY) · [full JSON](https://data.orchid-project.org/phases/systems/CU-DY.json) · [Cu–Dy system page](https://data.orchid-project.org/systems/CU-DY.html) · [Markdown](https://data.orchid-project.org/phases/pages/CU-DY.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)
Table: Phases of the Cu–Dy system (12)
| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-cu-dy-bcc-a2); _phase:cu-dy:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 803.02–2499.97 K, x(Dy) 0.76541–1 | 6 | 2 |
| [CU2DY](#phase-cu-dy-cu2dy); _phase:cu-dy:cu2dy_ | Hg2K · oI12 · Imma (74) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–1156.33 K, x(Dy) 0.33333–0.33333 | 27 | 2 |
| [CU5DY](#phase-cu-dy-cu5dy); _phase:cu-dy:cu5dy_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–1235.81 K, x(Dy) 0.16667–0.16667 | 11 | 1 |
| [CU5DY_C15B](#phase-cu-dy-cu5dy-c15b); _phase:cu-dy:cu5dy-c15b_ | AuBe5 · C15_b · cF24 · F-43m (216) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1203 K, x(Dy) 0.16667–0.16667 | 8 | 1 |
| [CU5DY_D2D](#phase-cu-dy-cu5dy-d2d); _phase:cu-dy:cu5dy-d2d_ | CaCu5 · D2_d · hP6 · P6/mmm (191) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1203–1235.15 K, x(Dy) 0.16667–0.16667 | 4 | 1 |
| [CU7DY](#phase-cu-dy-cu7dy); _phase:cu-dy:cu7dy_ | Cu7Tb · hP8 · P6/mmm (191) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 1050.99–1174.15 K, x(Dy) 0.125–0.125 | 20 | 2 |
| [CU7DY2](#phase-cu-dy-cu7dy2); _phase:cu-dy:cu7dy2_ | | needs_review | stable in 2 of 2 calculated diagram(s): 1127.08–1208.18 K, x(Dy) 0.22222–0.22222 | 11 | 2 |
| [CU9DY2](#phase-cu-dy-cu9dy2); _phase:cu-dy:cu9dy2_ | | needs_review | stable in 2 of 2 calculated diagram(s): 300–1244.48 K, x(Dy) 0.18182–0.18182 | 24 | 2 |
| [CUDY_B2](#phase-cu-dy-cudy-b2); _phase:cu-dy:cudy-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1226.33 K, x(Dy) 0.5–0.5 | 15 | 2 |
| [FCC_A1](#phase-cu-dy-fcc-a1); _phase:cu-dy:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1364.77 K, x(Dy) 0–3e-05 | 10 | 2 |
| [HCP_A3](#phase-cu-dy-hcp-a3); _phase:cu-dy:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1668.02 K, x(Dy) 0.87939–1 | 1 | 2 |
| [LIQUID](#phase-cu-dy-liquid); _phase:cu-dy:liquid_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 1019.54–2500 K, x(Dy) 0–1 | 49 | 2 |
## BCC_A2 (Cu–Dy)
- Id: `phase:cu-dy: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): 803.02–2499.97 K, x(Dy) 0.76541–1
- Literature: 6 values (6 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:bcc-a2)
Names (5): _corpus: _corpus:phase:cu-dy:bcc-a2
_paper: _paper:10.1016/j.calphad.2009.04.001:Dy bcc, paper:10.1016/j.jallcom.2008.03.007:Bcc
_tdb: _tdb:CuDy-09Pal.tdb:BCC_A2, tdb:CuDy-09Zha.tdb:BCC_A2
### TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): BCC_A2, type code %B, sha256 `12983d67968493e1…`
~~~~text
32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : CU DY% : VA : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): BCC_A2, type code %B, sha256 `6c6f9d652328ae39…`
~~~~text
33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CU DY% : VA : !
~~~~
Example references (3 of 3; assessments first):
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
## CU2DY (Cu–Dy)
- Id: `phase:cu-dy:cu2dy`; status `assigned`
- Structure: Hg2K · oI12 · Imma (74); type `st:hg2k-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](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (dft_space_group_74_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Cu 0.6667, Dy 0.3333
- Stability: stable in 2 of 2 calculated diagram(s): 300–1156.33 K, x(Dy) 0.33333–0.33333
- Literature: 27 values (27 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu2dy)
Names (5): _corpus: _corpus:phase:cu-dy:cu2dy
_paper: _paper:10.1016/j.calphad.2009.04.001:Cu2Dy, paper:10.1016/j.jallcom.2008.03.007:Cu2Dy
_tdb: _tdb:CuDy-09Pal.tdb:CU2DY, tdb:CuDy-09Zha.tdb:CU2DY
### TDB models of CU2DY (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): CU2DY, type code %, sha256 `12983d67968493e1…`
~~~~text
63: PHASE CU2DY % 2 2 1 !
64: CONST CU2DY : CU : DY : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CU2DY, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
68: PHASE CU2DY % 2 2 1 !
69: CONST CU2DY : CU : DY : !
~~~~
Example references (5 of 5; assessments first):
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
- [doi:10.1107/s0365110x6300181x](https://doi.org/10.1107/s0365110x6300181x) A. R. Storm, K. E. Benson, Lanthanide–copper intermetallic compounds having the CeCu\2\and AlB\2\structure, Acta Cryst 16, 701-702 (1963).
_cited as the source of values for this phase_
- [doi:10.1016/j.jallcom.2004.08.062](https://doi.org/10.1016/j.jallcom.2004.08.062) S.V. Meschel, O.J. Kleppa, Thermochemistry of some binary alloys of copper with the lanthanide metals by high-temperature direct synthesis calorimetry, Journal of Alloys and Compounds 388, 91-97 (2005).
_cited as the source of values for this phase_
## CU5DY (Cu–Dy)
- Id: `phase:cu-dy:cu5dy`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
- Candidate (dft_mp): P6/mmm (191) — on-hull MP DyCu5 at x(DY)=0.1667
- Candidate (dft_oqmd): P6/mmm (191) — on-hull OQMD Cu5 Dy1 at x(DY)=0.1667
- Candidate (tdb_comment): AuBe5 · cF24 · F-43m — CuDy-09Pal.tdb: 'Prototype AuBe5 (cF24, F-43m), LT'
- Candidate (tdb_comment): CaCu5 · hP6 · P6/mmm — CuDy-09Pal.tdb: 'Prototype CaCu5 (hP6, P6/mmm), HT'
- Stoichiometry: Cu 0.8333, Dy 0.1667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1235.81 K, x(Dy) 0.16667–0.16667
- Literature: 11 values (11 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu5dy)
Names (3): _corpus: _corpus:phase:cu-dy:cu5dy
_paper: _paper:10.1016/j.calphad.2009.04.001:Cu5Dy
_tdb: _tdb:CuDy-09Pal.tdb:CU5DY
### TDB models of CU5DY (1): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): CU5DY, type code %, sha256 `12983d67968493e1…`
~~~~text
48: PHASE CU5DY % 2 5 1 !
49: CONST CU5DY : CU : DY : !
~~~~
Example references (3 of 3; assessments first):
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
- [doi:10.1016/j.jallcom.2004.08.062](https://doi.org/10.1016/j.jallcom.2004.08.062) S.V. Meschel, O.J. Kleppa, Thermochemistry of some binary alloys of copper with the lanthanide metals by high-temperature direct synthesis calorimetry, Journal of Alloys and Compounds 388, 91-97 (2005).
_cited as the source of values for this phase_
## CU5DY_C15B (Cu–Dy)
- Id: `phase:cu-dy:cu5dy-c15b`; status `assigned`
- Structure: AuBe5 · C15_b · cF24 · F-43m (216); type `st:c15-b-aube5-cf24`; tier A: standard phase name; confidence high
- Stoichiometry: Cu 0.8333, Dy 0.1667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1203 K, x(Dy) 0.16667–0.16667
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu5dy-c15b)
Names (4): _corpus: _corpus:phase:cu-dy:cu5dy-c15b
_paper: _paper:10.1016/j.jallcom.2008.03.007:Cu5Dy.L, paper:10.1016/j.jallcom.2008.03.007:CuDy.L
_tdb: _tdb:CuDy-09Zha.tdb:CU5DY_C15B
### TDB models of CU5DY_C15B (1): PHASE and CONSTITUENT statements as written
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CU5DY_C15B, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
48: PHASE CU5DY_C15B % 2 5 1 !
49: CONST CU5DY_C15B : CU : DY : !
~~~~
Example references (2 of 2; assessments first):
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
## CU5DY_D2D (Cu–Dy)
- Id: `phase:cu-dy:cu5dy-d2d`; status `assigned`
- Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type `st:d2-d-cacu5-hp6`; tier A: standard phase name; confidence high
- Stoichiometry: Cu 0.8333, Dy 0.1667
- Stability: stable in 1 of 1 calculated diagram(s): 1203–1235.15 K, x(Dy) 0.16667–0.16667
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu5dy-d2d)
Names (4): _corpus: _corpus:phase:cu-dy:cu5dy-d2d
_paper: _paper:10.1016/j.jallcom.2008.03.007:Cu5Dy.H, paper:10.1016/j.jallcom.2008.03.007:Cu5Dy.L
_tdb: _tdb:CuDy-09Zha.tdb:CU5DY_D2D
### TDB models of CU5DY_D2D (1): PHASE and CONSTITUENT statements as written
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CU5DY_D2D, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
53: PHASE CU5DY_D2D % 2 5 1 !
54: CONST CU5DY_D2D : CU : DY : !
~~~~
Example references (2 of 2; assessments first):
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
## CU7DY (Cu–Dy)
- Id: `phase:cu-dy:cu7dy`; status `assigned`
- Structure: Cu7Tb · hP8 · P6/mmm (191); type `st:cu7tb-hp8`; 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 (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Cu 0.8750, Dy 0.1250
- Stability: stable in 2 of 2 calculated diagram(s): 1050.99–1174.15 K, x(Dy) 0.125–0.125
- Literature: 20 values (20 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu7dy)
Names (5): _corpus: _corpus:phase:cu-dy:cu7dy
_paper: _paper:10.1016/j.calphad.2009.04.001:Cu7Dy, paper:10.1016/j.jallcom.2008.03.007:Cu7Dy
_tdb: _tdb:CuDy-09Pal.tdb:CU7DY, tdb:CuDy-09Zha.tdb:CU7DY
### TDB models of CU7DY (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): CU7DY, type code %, sha256 `12983d67968493e1…`
~~~~text
42: PHASE CU7DY % 2 7 1 !
43: CONST CU7DY : CU : DY : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CU7DY, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
43: PHASE CU7DY % 2 7 1 !
44: CONST CU7DY : CU : DY : !
~~~~
Example references (4 of 4; assessments first):
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
- [doi:10.1107/s0567740871003558](https://doi.org/10.1107/s0567740871003558) K. H. J. Buschow, A. S. van der Goot, Composition and crystal structure of hexagonal Cu-rich rare earth–copper compounds, Acta Crystallogr B Struct Crystallogr Cryst Chem 27, 1085-1088 (1971).
_cited as the source of values for this phase_
## CU7DY2 (Cu–Dy)
- Id: `phase:cu-dy:cu7dy2`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Cu7Dy2) · mC\* — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Cu7Dy2) — Hallstedt 2025 mmc2 row for CU7DY2: Cu7Dy2
- Stoichiometry: Cu 0.7778, Dy 0.2222
- Stability: stable in 2 of 2 calculated diagram(s): 1127.08–1208.18 K, x(Dy) 0.22222–0.22222
- Literature: 11 values (11 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu7dy2)
Names (5): _corpus: _corpus:phase:cu-dy:cu7dy2
_paper: _paper:10.1016/j.calphad.2009.04.001:Cu7Dy2, paper:10.1016/j.jallcom.2008.03.007:Cu7Dy2
_tdb: _tdb:CuDy-09Pal.tdb:CU7DY2, tdb:CuDy-09Zha.tdb:CU7DY2
### TDB models of CU7DY2 (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): CU7DY2, type code %, sha256 `12983d67968493e1…`
~~~~text
58: PHASE CU7DY2 % 2 7 2 !
59: CONST CU7DY2 : CU : DY : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CU7DY2, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
63: PHASE CU7DY2 % 2 7 2 !
64: CONST CU7DY2 : CU : DY : !
~~~~
Example references (4 of 4; assessments first):
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
- [doi:10.1016/s0022-4596(03)00187-7](https://doi.org/10.1016/s0022-4596%2803%2900187-7) R. Černý, L. Guénée, R. Wessicken, A single crystal X-ray and HRTEM study of new series of compounds DyCux (x=4.5, 4 and 3.5), Journal of Solid State Chemistry 174, 125-131 (2003).
_cited as the source of values for this phase_
## CU9DY2 (Cu–Dy)
- Id: `phase:cu-dy:cu9dy2`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Cu9Dy2) · t\*\* or mC\* — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Cu9Dy2) — Hallstedt 2025 mmc2 row for CU9DY2: Cu9Dy2
- Stoichiometry: Cu 0.8182, Dy 0.1818
- Stability: stable in 2 of 2 calculated diagram(s): 300–1244.48 K, x(Dy) 0.18182–0.18182
- Literature: 24 values (24 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cu9dy2)
Names (5): _corpus: _corpus:phase:cu-dy:cu9dy2
_paper: _paper:10.1016/j.calphad.2009.04.001:Cu9Dy2, paper:10.1016/j.jallcom.2008.03.007:Cu9Dy2
_tdb: _tdb:CuDy-09Pal.tdb:CU9DY2, tdb:CuDy-09Zha.tdb:CU9DY2
### TDB models of CU9DY2 (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): CU9DY2, type code %, sha256 `12983d67968493e1…`
~~~~text
53: PHASE CU9DY2 % 2 9 2 !
54: CONST CU9DY2 : CU : DY : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CU9DY2, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
58: PHASE CU9DY2 % 2 9 2 !
59: CONST CU9DY2 : CU : DY : !
~~~~
Example references (4 of 4; assessments first):
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
- [doi:10.1016/s0022-4596(03)00187-7](https://doi.org/10.1016/s0022-4596%2803%2900187-7) R. Černý, L. Guénée, R. Wessicken, A single crystal X-ray and HRTEM study of new series of compounds DyCux (x=4.5, 4 and 3.5), Journal of Solid State Chemistry 174, 125-131 (2003).
_cited as the source of values for this phase_
## CUDY_B2 (Cu–Dy)
- Id: `phase:cu-dy:cudy-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Stoichiometry: Cu 0.5000, Dy 0.5000
- Stability: stable in 2 of 2 calculated diagram(s): 300–1226.33 K, x(Dy) 0.5–0.5
- Literature: 15 values (15 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:cudy-b2)
Names (5): _corpus: _corpus:phase:cu-dy:cudy-b2
_paper: _paper:10.1016/j.calphad.2009.04.001:CuDy, paper:10.1016/j.jallcom.2008.03.007:CuDy
_tdb: _tdb:CuDy-09Pal.tdb:CUDY_B2, tdb:CuDy-09Zha.tdb:CUDY_B2
### TDB models of CUDY_B2 (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): CUDY_B2, type code %, sha256 `12983d67968493e1…`
~~~~text
68: PHASE CUDY_B2 % 2 1 1 !
69: CONST CUDY_B2 : CU : DY : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): CUDY_B2, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
73: PHASE CUDY_B2 % 2 1 1 !
74: CONST CUDY_B2 : CU : DY : !
~~~~
Example references (3 of 3; assessments first):
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
## FCC_A1 (Cu–Dy)
- Id: `phase:cu-dy: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 2 of 2 calculated diagram(s): 300–1364.77 K, x(Dy) 0–3e-05
- Literature: 10 values (10 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:fcc-a1)
Names (5): _corpus: _corpus:phase:cu-dy:fcc-a1
_paper: _paper:10.1016/j.calphad.2009.04.001:Cu fcc, paper:10.1016/j.jallcom.2008.03.007:Fcc
_tdb: _tdb:CuDy-09Pal.tdb:FCC_A1, tdb:CuDy-09Zha.tdb:FCC_A1
### TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): FCC_A1, type code %A, sha256 `12983d67968493e1…`
~~~~text
27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : CU% DY : VA : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): FCC_A1, type code %A, sha256 `6c6f9d652328ae39…`
~~~~text
28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CU% DY : VA : !
~~~~
Example references (3 of 3; assessments first):
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for this phase_
## HCP_A3 (Cu–Dy)
- Id: `phase:cu-dy: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 2 of 2 calculated diagram(s): 300–1668.02 K, x(Dy) 0.87939–1
- Literature: 1 values (1 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:hcp-a3)
Names (4): _corpus: _corpus:phase:cu-dy:hcp-a3
_paper: _paper:10.1016/j.jallcom.2008.03.007:Hcp
_tdb: _tdb:CuDy-09Pal.tdb:HCP_A3, tdb:CuDy-09Zha.tdb:HCP_A3
### TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): HCP_A3, type code %A, sha256 `12983d67968493e1…`
~~~~text
37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : CU DY% : VA : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): HCP_A3, type code %A, sha256 `6c6f9d652328ae39…`
~~~~text
38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CU DY% : VA : !
~~~~
Example references (2 of 2; assessments first):
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase_
## LIQUID (Cu–Dy)
- Id: `phase:cu-dy:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 2 of 2 calculated diagram(s): 1019.54–2500 K, x(Dy) 0–1
- Literature: 49 values (49 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:cu-dy:liquid)
Names (5): _corpus: _corpus:phase:cu-dy:liquid
_paper: _paper:10.1016/j.calphad.2009.04.001:liquid, paper:10.1016/j.jallcom.2008.03.007:L
_tdb: _tdb:CuDy-09Pal.tdb:LIQUID, tdb:CuDy-09Zha.tdb:LIQUID
### TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written
[CuDy-09Pal.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Pal.tdb): LIQUID, type code %, sha256 `12983d67968493e1…`
~~~~text
22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : CU DY : !
~~~~
[CuDy-09Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/CuDy-09Zha.tdb): LIQUID, type code %, sha256 `6c6f9d652328ae39…`
~~~~text
23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CU DY : !
~~~~
Example references (3 of 3; assessments first):
- [doi:10.1016/j.jallcom.2008.03.007](https://doi.org/10.1016/j.jallcom.2008.03.007) L.G. Zhang, G.X. Huang, H.Y. Qi, B.R. Jia, L.B. Liu, Z.P. Jin, Thermodynamic assessment of the Cu–Dy binary system, Journal of Alloys and Compounds 470, 214-217 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2009.04.001](https://doi.org/10.1016/j.calphad.2009.04.001) M. Palumbo, L. Battezzati, A. Pasturel, S. Gottlieb-Schönmeyer, W. Assmus, Thermodynamic and ab initio investigation of the Cu–Dy system, Calphad 33, 511-516 (2009).
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(82)90092-3](https://doi.org/10.1016/0022-5088%2882%2990092-3) Enrico Franceschi, On the Dy-Cu system, Journal of the Less Common Metals 87, 249-256 (1982).
_cited as the source of values for 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).