Er–Te phases

8 phases (tier A 5, tier B 1, tier C 1, liquid 1); 6 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 · Er–Te system page · Markdown · field reference

Phases of the Er–Te system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
HEXAGONAL_A8 phase:er-te:a8-hexagonal	gamma-Se · A8 · hP3 · P3_121 (152)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–722.66 K, x(Te) 1–1	3	1
BCC_A2 phase:er-te:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
ER2TE3 phase:er-te:er2te3	Sc2S3 · oF80 · Fddd (70)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–1470 K, x(Te) 0.6–0.6	24	1
ERTE_B1 phase:er-te:erte-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1800 K, x(Te) 0.5–0.5	10	1
ERTE3 phase:er-te:erte3	NdTe3 · oC16 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–953.4 K, x(Te) 0.75–0.75	18	1
FCC_A1 phase:er-te:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:er-te:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1802 K, x(Te) 0–0	3	1
LIQUID phase:er-te:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 722.66–2500 K, x(Te) 0–1	22	1

HEXAGONAL_A8 (Er–Te)

Id: phase:er-te:a8-hexagonal; status assigned
Structure: gamma-Se · A8 · hP3 · P3_121 (152); type st:a8-gamma-se-hp3; tier A: standard phase name; confidence high
Stoichiometry: Te 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–722.66 K, x(Te) 1–1
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:er-te:a8-hexagonal, corpus:phase:er-te:hexagonal-a8
paper: paper:10.1007/s11669-022-00947-8:(Te)
tdb: tdb:ErTe-22Ben.tdb:HEXAGONAL_A8

TDB models of HEXAGONAL_A8 (1): PHASE and CONSTITUENT statements as written

ErTe-22Ben.tdb: HEXAGONAL_A8, type code %, sha256 f2f2246d321ba2f9…

47: PHASE HEXAGONAL_A8 % 1 1 !
48: CONST HEXAGONAL_A8 : TE : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase; reports values for this phase

BCC_A2 (Er–Te)

Id: phase:er-te:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Er 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:er-te:bcc-a2
tdb: tdb:ErTe-22Ben.tdb:BCC_A2

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

ErTe-22Ben.tdb: BCC_A2, type code %B, sha256 f2f2246d321ba2f9…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : ER : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase

ER2TE3 (Er–Te)

Id: phase:er-te:er2te3; status assigned
Structure: Sc2S3 · oF80 · Fddd (70); type st:sc2s3-of80; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Er 0.4000, Te 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 300–1470 K, x(Te) 0.6–0.6
Literature: 24 values (24 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:er-te:er2te3
mp: mp:mp-aaaaavrf
oqmd: oqmd:oqmd-665800
paper: paper:10.1007/s11669-022-00947-8:Er2Te3
tdb: tdb:ErTe-22Ben.tdb:ER2TE3

TDB models of ER2TE3 (1): PHASE and CONSTITUENT statements as written

ErTe-22Ben.tdb: ER2TE3, type code %, sha256 f2f2246d321ba2f9…

57: PHASE ER2TE3 % 2 2 3 !
58: CONST ER2TE3 : ER : TE : !

Example references (6 of 6; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase; reports values for this phase
doi:10.1016/j.electacta.2016.11.075 V.P. Vassiliev, V.A. Lysenko, A New Approach for the Study of Thermodynamic Properties of Lanthanide Compounds, Electrochimica Acta 222, 1770-1777 (2016).
cited as the source of values for this phase
doi:10.1021/ic50026a021 D. J. Haase, H. Steinfink, E. J. Weiss, The Phase Equilibria and Crystal Chemistry of the Rare Earth Group VI Systems. II. Erbium-Tellurium, Inorg. Chem. 4, 541-543 (1965).
cited as the source of values for this phase
doi:10.1038/npjcompumats.2015.10 Scott Kirklin, James E Saal, Bryce Meredig, Alex Thompson, Jeff W Doak, Muratahan Aykol et al., The Open Quantum Materials Database (OQMD): assessing the accuracy of DFT formation energies, npj Comput Mater 1 (2015).
cited as the source of values for this phase
doi:10.1063/1.4812323 Anubhav Jain, Shyue Ping Ong, Geoffroy Hautier, Wei Chen, William Davidson Richards, Stephen Dacek et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013).
cited as the source of values for this phase
doi:10.15330/pcss.21.2.312-318 S. Z. Imamaliyeva, I. F. Mehdiyeva, D. B. Taghiyev, M. B. Babanly, Thermodynamic investigations of the erbium tellurides by EMF method, PCSS 21, 312-318 (2020).
cited as the source of values for this phase

ERTE_B1 (Er–Te)

Id: phase:er-te:erte-b1; status assigned
Structure: NaCl · B1 · cF8 · Fm-3m (225); type st:b1-nacl-cf8; tier A: standard phase name; confidence high
Stoichiometry: Er 0.5000, Te 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1800 K, x(Te) 0.5–0.5
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-te:erte-b1
paper: paper:10.1007/s11669-022-00947-8:ErTe
tdb: tdb:ErTe-22Ben.tdb:ERTE_B1

TDB models of ERTE_B1 (1): PHASE and CONSTITUENT statements as written

ErTe-22Ben.tdb: ERTE_B1, type code %, sha256 f2f2246d321ba2f9…

52: PHASE ERTE_B1 % 2 1 1 !
53: CONST ERTE_B1 : ER : TE : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase; reports values for this phase
doi:10.1021/ic50026a021 D. J. Haase, H. Steinfink, E. J. Weiss, The Phase Equilibria and Crystal Chemistry of the Rare Earth Group VI Systems. II. Erbium-Tellurium, Inorg. Chem. 4, 541-543 (1965).
cited as the source of values for this phase

ERTE3 (Er–Te)

Id: phase:er-te:erte3; status assigned
Structure: NdTe3 · oC16 · Cmcm (63); type st:ndte3-oc16; 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_63_matches_6_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Er 0.2500, Te 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–953.4 K, x(Te) 0.75–0.75
Literature: 18 values (18 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-te:erte3
paper: paper:10.1007/s11669-022-00947-8:ErTe3
tdb: tdb:ErTe-22Ben.tdb:ERTE3

TDB models of ERTE3 (1): PHASE and CONSTITUENT statements as written

ErTe-22Ben.tdb: ERTE3, type code %, sha256 f2f2246d321ba2f9…

62: PHASE ERTE3 % 2 1 3 !
63: CONST ERTE3 : ER : TE : !

Example references (5 of 5; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase; reports values for this phase
doi:10.1021/ic50026a021 D. J. Haase, H. Steinfink, E. J. Weiss, The Phase Equilibria and Crystal Chemistry of the Rare Earth Group VI Systems. II. Erbium-Tellurium, Inorg. Chem. 4, 541-543 (1965).
cited as the source of values for this phase
doi:10.1038/npjcompumats.2015.10 Scott Kirklin, James E Saal, Bryce Meredig, Alex Thompson, Jeff W Doak, Muratahan Aykol et al., The Open Quantum Materials Database (OQMD): assessing the accuracy of DFT formation energies, npj Comput Mater 1 (2015).
cited as the source of values for this phase
doi:10.1063/1.4812323 Anubhav Jain, Shyue Ping Ong, Geoffroy Hautier, Wei Chen, William Davidson Richards, Stephen Dacek et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013).
cited as the source of values for this phase
doi:10.15330/pcss.21.2.312-318 S. Z. Imamaliyeva, I. F. Mehdiyeva, D. B. Taghiyev, M. B. Babanly, Thermodynamic investigations of the erbium tellurides by EMF method, PCSS 21, 312-318 (2020).
cited as the source of values for this phase

FCC_A1 (Er–Te)

Id: phase:er-te:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Er 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:er-te:fcc-a1
tdb: tdb:ErTe-22Ben.tdb:FCC_A1

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

ErTe-22Ben.tdb: FCC_A1, type code %A, sha256 f2f2246d321ba2f9…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : ER : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase

HCP_A3 (Er–Te)

Id: phase:er-te: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: Er 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1802 K, x(Te) 0–0
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-te:hcp-a3
paper: paper:10.1007/s11669-022-00947-8:(Er)
tdb: tdb:ErTe-22Ben.tdb:HCP_A3

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

ErTe-22Ben.tdb: HCP_A3, type code %A, sha256 f2f2246d321ba2f9…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : ER : VA: !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase; reports values for this phase
doi:10.1021/ic50026a021 D. J. Haase, H. Steinfink, E. J. Weiss, The Phase Equilibria and Crystal Chemistry of the Rare Earth Group VI Systems. II. Erbium-Tellurium, Inorg. Chem. 4, 541-543 (1965).
cited as the source of values for this phase

LIQUID (Er–Te)

Id: phase:er-te:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 722.66–2500 K, x(Te) 0–1
Literature: 22 values (22 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:er-te:liquid
paper: paper:10.1007/s11669-022-00947-8:L, paper:10.1007/s11669-022-00947-8:liquid
tdb: tdb:ErTe-22Ben.tdb:LIQUID

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

ErTe-22Ben.tdb: LIQUID, type code %, sha256 f2f2246d321ba2f9…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : ER ERTE ER2TE3 TE : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-022-00947-8 S. Bennoui, Y. Djaballah, V. Vassiliev, A. Belgacem-Bouzida, Thermodynamic Study of Er-Bi and Er-Te Systems by Combination of First-Principles Calculations and the CALPHAD Method, J. Phase Equilib. Diffus. 43, 126-138 (2022).
assessment that models this phase; reports values for this phase
doi:10.1021/ic50026a021 D. J. Haase, H. Steinfink, E. J. Weiss, The Phase Equilibria and Crystal Chemistry of the Rare Earth Group VI Systems. II. Erbium-Tellurium, Inorg. Chem. 4, 541-543 (1965).
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}
}