Au–Er phases

11 phases (tier A 9, tier C 1, liquid 1); 10 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 · Au–Er system page · Markdown · field reference

Phases of the Au–Er system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
AU10ER7 phase:au-er:au10er7	Au10Gd7 · tI136 · I4_1/acd (142)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1635.32 K, x(Er) 0.41176–0.41176	8	1
AU2ER_C11B phase:au-er:au2er-c11b	MoSi2 · C11_b · tI6 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1637.54 K, x(Er) 0.33333–0.33333	7	1
AU3ER_D0A phase:au-er:au3er-d0a	beta-Cu3Ti · D0_a · oP8 · Pmmn (59)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1552.54 K, x(Er) 0.25–0.25	6	1
AU4ER_D1A phase:au-er:au4er-d1a	MoNi4 · D1_a · tI10 · I4/m (87)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1273.86 K, x(Er) 0.2–0.2	5	1
AUER_B2 phase:au-er:auer-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1890.97–1978.47 K, x(Er) 0.5–0.5	4	1
AUER_B33 phase:au-er:auer-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1890.97 K, x(Er) 0.5–0.5	7	1
AUER2_C37 phase:au-er:auer2-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1386.71 K, x(Er) 0.66667–0.66667	4	1
BCC_A2 phase:au-er:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:au-er:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1345.32 K, x(Er) 0–0.07195	3	1
HCP_A3 phase:au-er:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.43 K, x(Er) 0.99288–1	2	1
LIQUID phase:au-er:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1077.82–2500 K, x(Er) 0–1	23	1

AU10ER7 (Au–Er)

Id: phase:au-er:au10er7; status assigned
Structure: Au10Gd7 · tI136 · I4_1/acd (142); type st:au10gd7-ti136; 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: Au 0.5882, Er 0.4118
Stability: stable in 1 of 1 calculated diagram(s): 300–1635.32 K, x(Er) 0.41176–0.41176
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:au10er7
paper: paper:10.1016/j.jallcom.2011.01.072:Au10Er7
tdb: tdb:AuEr-11Don.tdb:AU10ER7

TDB models of AU10ER7 (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AU10ER7, type code %, sha256 f614597f077a07e2…

56: PHASE AU10ER7 % 2 10 7 !
57: CONST AU10ER7 : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

AU2ER_C11B (Au–Er)

Id: phase:au-er:au2er-c11b; status assigned
Structure: MoSi2 · C11_b · tI6 · I4/mmm (139); type st:c11-b-mosi2-ti6; tier A: standard phase name; confidence high
Stoichiometry: Au 0.6667, Er 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1637.54 K, x(Er) 0.33333–0.33333
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:au2er-c11b
paper: paper:10.1016/j.jallcom.2011.01.072:Au2Er
tdb: tdb:AuEr-11Don.tdb:AU2ER_C11B

TDB models of AU2ER_C11B (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AU2ER_C11B, type code %, sha256 f614597f077a07e2…

51: PHASE AU2ER_C11B % 2 2 1 !
52: CONST AU2ER_C11B : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

AU3ER_D0A (Au–Er)

Id: phase:au-er:au3er-d0a; status assigned
Structure: beta-Cu3Ti · D0_a · oP8 · Pmmn (59); type st:d0-a-beta-cu3ti-op8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacjmto and oqmd-28151, space group 59
Stoichiometry: Au 0.7500, Er 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1552.54 K, x(Er) 0.25–0.25
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:au-er:au3er-d0a
mp: mp:mp-aaacjmto
oqmd: oqmd:oqmd-28151
paper: paper:10.1016/j.jallcom.2011.01.072:Au3Er
tdb: tdb:AuEr-11Don.tdb:AU3ER_D0A

TDB models of AU3ER_D0A (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AU3ER_D0A, type code %, sha256 f614597f077a07e2…

46: PHASE AU3ER_D0A % 2 3 1 !
47: CONST AU3ER_D0A : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

AU4ER_D1A (Au–Er)

Id: phase:au-er:au4er-d1a; status assigned
Structure: MoNi4 · D1_a · tI10 · I4/m (87); type st:d1-a-moni4-ti10; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacixsh and oqmd-28152, space group 87
Stoichiometry: Au 0.8000, Er 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–1273.86 K, x(Er) 0.2–0.2
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:au-er:au4er-d1a
mp: mp:mp-aaacixsh
oqmd: oqmd:oqmd-28152
paper: paper:10.1016/j.jallcom.2011.01.072:Au4Er
tdb: tdb:AuEr-11Don.tdb:AU4ER_D1A

TDB models of AU4ER_D1A (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AU4ER_D1A, type code %, sha256 f614597f077a07e2…

41: PHASE AU4ER_D1A % 2 4 1 !
42: CONST AU4ER_D1A : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

AUER_B2 (Au–Er)

Id: phase:au-er:auer-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stoichiometry: Au 0.5000, Er 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 1890.97–1978.47 K, x(Er) 0.5–0.5
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:auer-b2
paper: paper:10.1016/j.jallcom.2011.01.072:βAuEr
tdb: tdb:AuEr-11Don.tdb:AUER_B2

TDB models of AUER_B2 (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AUER_B2, type code %, sha256 f614597f077a07e2…

66: PHASE AUER_B2 % 2 1 1 !
67: CONST AUER_B2 : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

AUER_B33 (Au–Er)

Id: phase:au-er:auer-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Stoichiometry: Au 0.5000, Er 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1890.97 K, x(Er) 0.5–0.5
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:auer-b33
paper: paper:10.1016/j.jallcom.2011.01.072:αAuEr
tdb: tdb:AuEr-11Don.tdb:AUER_B33

TDB models of AUER_B33 (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AUER_B33, type code %, sha256 f614597f077a07e2…

61: PHASE AUER_B33 % 2 1 1 !
62: CONST AUER_B33 : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

AUER2_C37 (Au–Er)

Id: phase:au-er:auer2-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacktqa and oqmd-1436040, space group 62
Stoichiometry: Au 0.3333, Er 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1386.71 K, x(Er) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:au-er:auer2-c37
mp: mp:mp-aaacktqa
oqmd: oqmd:oqmd-1436040
paper: paper:10.1016/j.jallcom.2011.01.072:AuEr2
tdb: tdb:AuEr-11Don.tdb:AUER2_C37

TDB models of AUER2_C37 (1): PHASE and CONSTITUENT statements as written

AuEr-11Don.tdb: AUER2_C37, type code %, sha256 f614597f077a07e2…

71: PHASE AUER2_C37 % 2 1 2 !
72: CONST AUER2_C37 : AU : ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

BCC_A2 (Au–Er)

Id: phase:au-er:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; 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:au-er:bcc-a2
tdb: tdb:AuEr-11Don.tdb:BCC_A2

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

AuEr-11Don.tdb: BCC_A2, type code %B, sha256 f614597f077a07e2…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : AU ER : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase

FCC_A1 (Au–Er)

Id: phase:au-er: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 1 of 1 calculated diagram(s): 300–1345.32 K, x(Er) 0–0.07195
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:fcc-a1
paper: paper:10.1016/j.jallcom.2011.01.072:Au(fcc)
tdb: tdb:AuEr-11Don.tdb:FCC_A1

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

AuEr-11Don.tdb: FCC_A1, type code %A, sha256 f614597f077a07e2…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : AU% ER : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

HCP_A3 (Au–Er)

Id: phase:au-er: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): 300–2499.43 K, x(Er) 0.99288–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:hcp-a3
paper: paper:10.1016/j.jallcom.2011.01.072:Er(hcp)
tdb: tdb:AuEr-11Don.tdb:HCP_A3

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

AuEr-11Don.tdb: HCP_A3, type code %A, sha256 f614597f077a07e2…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : AU ER : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
cited as the source of values for this phase

LIQUID (Au–Er)

Id: phase:au-er:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1077.82–2500 K, x(Er) 0–1
Literature: 23 values (23 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:au-er:liquid
paper: paper:10.1016/j.jallcom.2011.01.072:L
tdb: tdb:AuEr-11Don.tdb:LIQUID

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

AuEr-11Don.tdb: LIQUID, type code %, sha256 f614597f077a07e2…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : AU ER : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2011.01.072 H.Q. Dong, X.M. Tao, H.S. Liu, T. Laurila, M. Paulastro-Kröckel, Thermodynamic assessment of Au–La and Au–Er binary systems, Journal of Alloys and Compounds 509, 4439-4444 (2011).
assessment that models this phase; reports values for this phase
doi:10.1016/s0966-9795(02)00093-6 A. Saccone, D. Macciò, S. Delfino, R. Ferro, Alloying behavior of the rare earth metals with gold: the Ho–Au, Er–Au and Tm–Au systems, Intermetallics 10, 903-913 (2002).
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). 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}
}