Pd–Se phases

14 phases (tier A 4, tier B 1, tier C 5, 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 · full JSON · Pd–Se system page · Markdown · field reference

Phases of the Pd–Se system (14)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
HEXAGONAL_A8 phase:pd-se:a8-hexagonal	gamma-Se · A8 · hP3 · P3_121 (152)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–494 K, x(Se) 1–1	0	1
BCC_A2 phase:pd-se: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:pd-se:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1867.63 K, x(Se) 0–0.0158	8	1
HCP_A3 phase:pd-se:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:pd-se:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 494–2500 K, x(Se) 0–1	28	1
PD17SE15 phase:pd-se:pd17se15	Pd17Se15 · cP64 · Pm-3m (221)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–954.58 K, x(Se) 0.46875–0.46875	12	1
PD34SE11 phase:pd-se:pd34se11	Pd34Se11 · mP90 · P2_1/c (14)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–703.97 K, x(Se) 0.24444–0.24444	14	1
PD4SE_HT phase:pd-se:pd4se-ht		needs_review	stable in 1 of 1 calculated diagram(s): 800.35–818.06 K, x(Se) 0.2–0.2	12	1
PD4SE_LT phase:pd-se:pd4se-lt	Pd4Se · tP10 · P-42_1c (114)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–800.35 K, x(Se) 0.2–0.2	8	1
PD7SE2 phase:pd-se:pd7se2	Pd7Se2 · mP18 · P2_1/c (14)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–811.27 K, x(Se) 0.22222–0.22222	11	1
PD7SE4 phase:pd-se:pd7se4	Pd7Se4 · oP22 · P2_12_12 (18)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–687.31 K, x(Se) 0.36364–0.36364	11	1
PD9SE2 phase:pd-se:pd9se2		needs_review	stable in 1 of 1 calculated diagram(s): 673.64–910.06 K, x(Se) 0.18182–0.18182	12	1
PDSE phase:pd-se:pdse		needs_review	stable in 1 of 1 calculated diagram(s): 468.56–890.81 K, x(Se) 0.5–0.5	7	1
PDSE2 phase:pd-se:pdse2	PdSe2 · oP12 · Pbca (61)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1457.5 K, x(Se) 0.66667–0.66667	11	1

HEXAGONAL_A8 (Pd–Se)

Id: phase:pd-se: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: Se 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–494 K, x(Se) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pd-se:a8-hexagonal
tdb: tdb:PdSe-14Bor.tdb:HEXAGONAL_A8

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

PdSe-14Bor.tdb: HEXAGONAL_A8, type code %, sha256 e26c4eccbccb63c1…

42: PHASE HEXAGONAL_A8 % 1 1 !
43: CONST HEXAGONAL_A8 : SE : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase

BCC_A2 (Pd–Se)

Id: phase:pd-se:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Pd 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:pd-se:bcc-a2
tdb: tdb:PdSe-14Bor.tdb:BCC_A2

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

PdSe-14Bor.tdb: BCC_A2, type code %B, sha256 e26c4eccbccb63c1…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : PD : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase

FCC_A1 (Pd–Se)

Id: phase:pd-se: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): 300–1867.63 K, x(Se) 0–0.0158
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:fcc-a1
paper: paper:10.1016/j.jnucmat.2014.03.044:FCC
tdb: tdb:PdSe-14Bor.tdb:FCC_A1

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

PdSe-14Bor.tdb: FCC_A1, type code %A, sha256 e26c4eccbccb63c1…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : PD% SE : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase

HCP_A3 (Pd–Se)

Id: phase:pd-se: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: Pd 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:pd-se:hcp-a3
tdb: tdb:PdSe-14Bor.tdb:HCP_A3

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

PdSe-14Bor.tdb: HCP_A3, type code %A, sha256 e26c4eccbccb63c1…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : PD : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase

LIQUID (Pd–Se)

Id: phase:pd-se:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 494–2500 K, x(Se) 0–1
Literature: 28 values (28 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:liquid
paper: paper:10.1016/j.jnucmat.2014.03.044:L
tdb: tdb:PdSe-14Bor.tdb:LIQUID

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

PdSe-14Bor.tdb: LIQUID, type code %, sha256 e26c4eccbccb63c1…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : PD SE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase

PD17SE15 (Pd–Se)

Id: phase:pd-se:pd17se15; status assigned
Structure: Pd17Se15 · cP64 · Pm-3m (221); type st:pd17se15-cp64; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Pd 0.5312, Se 0.4688
Stability: stable in 1 of 1 calculated diagram(s): 300–954.58 K, x(Se) 0.46875–0.46875
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:pd-se:pd17se15
mp: mp:mp-aaaabgfd
oqmd: oqmd:oqmd-92418
paper: paper:10.1016/j.jnucmat.2014.03.044:Pd17Se15
tdb: tdb:PdSe-14Bor.tdb:PD17SE15

TDB models of PD17SE15 (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD17SE15, type code %, sha256 e26c4eccbccb63c1…

77: PHASE PD17SE15 % 2 17 15 !
78: CONST PD17SE15 : PD : SE : !

Example references (5 of 5; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase
doi:10.1107/s0365110x62001929 S. Geller, The crystal structure of Pd17Se15, Acta Cryst 15, 713-721 (1962).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.14-1623 Arne Kjekshus, Anna Nylund, S. Rundqvist, E. Varde, Gertrud Westin, High Temperature X-Ray Study of the Thermal Expansion of Pd9Se8 and Rh9S8., Acta Chem. Scand. 14, 1623-1626 (1960).
cited as the source of values for this phase

PD34SE11 (Pd–Se)

Id: phase:pd-se:pd34se11; status assigned
Structure: Pd34Se11 · mP90 · P2_1/c (14); type st:pd34se11-mp90; 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: Pd 0.7556, Se 0.2444
Stability: stable in 1 of 1 calculated diagram(s): 300–703.97 K, x(Se) 0.24444–0.24444
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pd34se11
paper: paper:10.1016/j.jnucmat.2014.03.044:Pd34Se11
tdb: tdb:PdSe-14Bor.tdb:PD34SE11

TDB models of PD34SE11 (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD34SE11, type code %, sha256 e26c4eccbccb63c1…

67: PHASE PD34SE11 % 2 34 11 !
68: CONST PD34SE11 : PD : SE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase

PD4SE_HT (Pd–Se)

Id: phase:pd-se:pd4se-ht; 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 (dft_mp): P-42_1c (114) — on-hull MP Pd4Se at x(SE)=0.2000
Candidate (dft_oqmd): P-421c (114) — on-hull OQMD Pd4 Se1 at x(SE)=0.2000
Candidate (literature_printed): (Pd4Se-ht) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Pd4Se-ht) — Hallstedt 2025 mmc2 row for PD4SE_HT: Pd4Se (high T)
Stoichiometry: Pd 0.8000, Se 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 800.35–818.06 K, x(Se) 0.2–0.2
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pd4se-ht
paper: paper:10.1016/j.jnucmat.2014.03.044:β-Pd4Se
tdb: tdb:PdSe-14Bor.tdb:PD4SE_HT

TDB models of PD4SE_HT (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD4SE_HT, type code %, sha256 e26c4eccbccb63c1…

57: PHASE PD4SE_HT % 2 4 1 !
58: CONST PD4SE_HT : PD : SE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase

PD4SE_LT (Pd–Se)

Id: phase:pd-se:pd4se-lt; status assigned
Structure: Pd4Se · tP10 · P-42_1c (114); type st:pd4se-tp10; 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: Pd 0.8000, Se 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–800.35 K, x(Se) 0.2–0.2
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pd-se:pd4se-lt
paper: paper:10.1016/j.jnucmat.2014.03.044:α, paper:10.1016/j.jnucmat.2014.03.044:α-Pd4Se
tdb: tdb:PdSe-14Bor.tdb:PD4SE_LT

TDB models of PD4SE_LT (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD4SE_LT, type code %, sha256 e26c4eccbccb63c1…

52: PHASE PD4SE_LT % 2 4 1 !
53: CONST PD4SE_LT : PD : SE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase

PD7SE2 (Pd–Se)

Id: phase:pd-se:pd7se2; status assigned
Structure: Pd7Se2 · mP18 · P2_1/c (14); type st:pd7se2-mp18; 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: Pd 0.7778, Se 0.2222
Stability: stable in 1 of 1 calculated diagram(s): 300–811.27 K, x(Se) 0.22222–0.22222
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pd7se2
paper: paper:10.1016/j.jnucmat.2014.03.044:Pd7Se2
tdb: tdb:PdSe-14Bor.tdb:PD7SE2

TDB models of PD7SE2 (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD7SE2, type code %, sha256 e26c4eccbccb63c1…

62: PHASE PD7SE2 % 2 7 2 !
63: CONST PD7SE2 : PD : SE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase

PD7SE4 (Pd–Se)

Id: phase:pd-se:pd7se4; status assigned
Structure: Pd7Se4 · oP22 · P2_12_12 (18); type st:pd7se4-op22; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Pd 0.6364, Se 0.3636
Stability: stable in 1 of 1 calculated diagram(s): 300–687.31 K, x(Se) 0.36364–0.36364
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pd7se4
paper: paper:10.1016/j.jnucmat.2014.03.044:Pd7Se4
tdb: tdb:PdSe-14Bor.tdb:PD7SE4

TDB models of PD7SE4 (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD7SE4, type code %, sha256 e26c4eccbccb63c1…

72: PHASE PD7SE4 % 2 7 4 !
73: CONST PD7SE4 : PD : SE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase
doi:10.1016/0022-5088(78)90133-9 T. Matković, K. Schubert, Kristallstruktur von Pd7Se4, Journal of the Less Common Metals 59, P57-P63 (1978).
cited as the source of values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase

PD9SE2 (Pd–Se)

Id: phase:pd-se:pd9se2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Pd9Se2) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Pd9Se2) — Hallstedt 2025 mmc2 row for PD9SE2: Pd9Se2
Stoichiometry: Pd 0.8182, Se 0.1818
Stability: stable in 1 of 1 calculated diagram(s): 673.64–910.06 K, x(Se) 0.18182–0.18182
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pd9se2
paper: paper:10.1016/j.jnucmat.2014.03.044:Pd9Se2
tdb: tdb:PdSe-14Bor.tdb:PD9SE2

TDB models of PD9SE2 (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PD9SE2, type code %, sha256 e26c4eccbccb63c1…

47: PHASE PD9SE2 % 2 9 2 !
48: CONST PD9SE2 : PD : SE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(87)90444-9 T. Takabatake, M. Ishikawa, J.L. Jorda, Superconductivity and phase relations in the Pd-Se system, Journal of the Less Common Metals 134, 79-89 (1987).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase

PDSE (Pd–Se)

Id: phase:pd-se:pdse; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:sgte_mmc2_row_disagrees_with_dft; no_structure_token; sgte_mmc2_row_disagrees_with_dft
Candidate (dft_mp): P4_2/m (84) — on-hull MP PdSe at x(SE)=0.5000
Candidate (dft_oqmd): P42/m (84) — on-hull OQMD Pd1 Se1 at x(SE)=0.5000
Candidate (literature_printed): Pd(S,Se) · tP48 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Pd(S,Se) · tP48 · P4_2/mbc (135) — Hallstedt 2025 mmc2 row for PDSE: PdSe
Candidate (tdb_comment): Pd · S · Se — PdSe-14Bor.tdb: 'Prototype Pd(S,Se) (tP48, P4_2/mbc)'
Stoichiometry: Pd 0.5000, Se 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 468.56–890.81 K, x(Se) 0.5–0.5
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pdse
paper: paper:10.1016/j.jnucmat.2014.03.044:PdSe
tdb: tdb:PdSe-14Bor.tdb:PDSE

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

PdSe-14Bor.tdb: PDSE, type code %, sha256 e26c4eccbccb63c1…

82: PHASE PDSE % 2 1 1 !
83: CONST PDSE : PD : SE : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
cited as the source of values for this phase

PDSE2 (Pd–Se)

Id: phase:pd-se:pdse2; status assigned
Structure: PdSe2 · oP12 · Pbca (61); type st:pdse2-op12; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Pd 0.3333, Se 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1457.5 K, x(Se) 0.66667–0.66667
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pd-se:pdse2
paper: paper:10.1016/j.jnucmat.2014.03.044:PdSe2
tdb: tdb:PdSe-14Bor.tdb:PDSE2

TDB models of PDSE2 (1): PHASE and CONSTITUENT statements as written

PdSe-14Bor.tdb: PDSE2, type code %, sha256 e26c4eccbccb63c1…

87: PHASE PDSE2 % 2 1 2 !
88: CONST PDSE2 : PD : SE : !

Example references (5 of 5; assessments first):

doi:10.1016/j.jnucmat.2014.03.044 S. Bordier, A. Chocard, S. Gossé, Thermodynamic assessment of the palladium–selenium (Pd–Se) system, Journal of Nuclear Materials 451, 120-129 (2014).
assessment that models this phase; reports values for this phase
doi:10.1107/s0365110x57000948 F. Grønvold, E. Røst, The crystal structure of PdSe2 and PdS2, Acta Cryst 10, 329-331 (1957).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.10-1620 Fredrik Grønvold, Erling Røst, Bengt Aurivillius, N. A. Eliasson, B. Thorell, On the Sulfides, Selenides, and Tellurides of Palladium., Acta Chem. Scand. 10, 1620-1634 (1956).
cited as the source of values for this phase
doi:10.1134/s0016702911030098 T. A. Stolyarova, M. V. Voronin, E. G. Osadchii, Enthalpies of formation of verbeekite (PdSe2) and palladseite (Pd17Se15) from elements, Geochem. Int. 49, 309-313 (2011).
cited as the source of values for this phase
doi:10.3891/acta.chem.scand.33a-0251 Torbjørn Olsen, Erling Røst, Fredrik Grønvold, Arne F. Andresen, Eberhard Hoyer, V. P. Spiridonov et al., Phase Relationships of Palladium Selenides., Acta Chem. Scand. 33a, 251-256 (1979).
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}
}