Bi–K phases

10 phases (tier A 7, tier C 2, liquid 1); 8 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 · Bi–K system page · Markdown · field reference

Phases of the Bi–K system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:bi-k:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–544.55 K, x(K) 0–0	4	3
BCC_A2 phase:bi-k:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–336.53 K, x(K) 1–1	4	3
BI2K_C15 phase:bi-k:bi2k-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–837.91 K, x(K) 0.33333–0.33333	12	3
BI2K3 phase:bi-k:bi2k3	Eu3Ga2 · mC20 · C2/c (15)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 3 of 3 calculated diagram(s): 300–720 K, x(K) 0.6–0.6	17	3
BI4K5 phase:bi-k:bi4k5	Bi4K5 · mC18 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 3 of 3 calculated diagram(s): 300–656.4 K, x(K) 0.55556–0.55556	21	3
BIK3_D021 phase:bi-k:bik3-d021	Cu3P · D0_21 · hP24 · P6_3cm (185)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–555.33 K, x(K) 0.75–0.75	7	3
BIK3_D03 phase:bi-k:bik3-d03	BiF3 · D0_3 · cF16 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 553–990 K, x(K) 0.75–0.75	10	3
FCC_A1 phase:bi-k:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
HCP_A3 phase:bi-k:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
LIQUID phase:bi-k:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 336.32–2500 K, x(K) 0–1	29	3

RHOMBOHEDRAL_A7 (Bi–K)

Id: phase:bi-k:a7-rhombohedral; status assigned
Structure: alpha-As · A7 · hR2 · R-3m (166); type st:a7-alpha-as-hr2; tier A: standard phase name; confidence high
Stoichiometry: Bi 1.0000
Stability: stable in 3 of 3 calculated diagram(s): 300–544.55 K, x(K) 0–0
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:bi-k:a7-rhombohedral, corpus:phase:bi-k:rhombohedral-a7
paper: paper:10.1016/j.tca.2011.10.032:Rhom
tdb: tdb:BiK-12Niu.tdb:RHOMBOHEDRAL_A7, tdb:BiK-15Gie.tdb:RHOMBOHEDRAL_A7, tdb:BiK-80Che-LB.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: RHOMBOHEDRAL_A7, type code %, sha256 3ce72b86413e842a…

45: PHASE RHOMBOHEDRAL_A7 % 1 1 !
46: CONST RHOMBOHEDRAL_A7 : BI : !

BiK-15Gie.tdb: RHOMBOHEDRAL_A7, type code %, sha256 530ca2f96b764f0e…

49: PHASE RHOMBOHEDRAL_A7 % 1 1 !
50: CONST RHOMBOHEDRAL_A7 : BI : !

BiK-80Che-LB.tdb: RHOMBOHEDRAL_A7, type code %, sha256 e6d765540ed2fd20…

43: PHASE RHOMBOHEDRAL_A7 % 1 1 !
44: CONST RHOMBOHEDRAL_A7 : BI : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

BCC_A2 (Bi–K)

Id: phase:bi-k: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 3 of 3 calculated diagram(s): 300–336.53 K, x(K) 1–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-k:bcc-a2
paper: paper:10.1016/j.tca.2011.10.032:BCC_A2
tdb: tdb:BiK-12Niu.tdb:BCC_A2, tdb:BiK-15Gie.tdb:BCC_A2, tdb:BiK-80Che-LB.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: BCC_A2, type code %B, sha256 3ce72b86413e842a…

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

BiK-15Gie.tdb: BCC_A2, type code %B, sha256 530ca2f96b764f0e…

39: PHASE BCC_A2 %B 2 1 3 !
40: CONST BCC_A2 : BI K : VA : !

BiK-80Che-LB.tdb: BCC_A2, type code %B, sha256 e6d765540ed2fd20…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : BI K : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

BI2K_C15 (Bi–K)

Id: phase:bi-k:bi2k-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabilj and oqmd-647551, space group 227
Stoichiometry: Bi 0.6667, K 0.3333
Stability: stable in 3 of 3 calculated diagram(s): 300–837.91 K, x(K) 0.33333–0.33333
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:bi-k:bi2k-c15
mp: mp:mp-aaaabilj
oqmd: oqmd:oqmd-647551
paper: paper:10.1016/j.tca.2011.10.032:Bi2K
tdb: tdb:BiK-12Niu.tdb:BI2K_C15, tdb:BiK-15Gie.tdb:BI2K_C15, tdb:BiK-80Che-LB.tdb:BI2K_C15

TDB models of BI2K_C15 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: BI2K_C15, type code %, sha256 3ce72b86413e842a…

50: PHASE BI2K_C15 % 2 2 1 !
51: CONST BI2K_C15 : BI : K : !

BiK-15Gie.tdb: BI2K_C15, type code %, sha256 530ca2f96b764f0e…

54: PHASE BI2K_C15 % 2 2 1 !
55: CONST BI2K_C15 : BI : K : !

BiK-80Che-LB.tdb: BI2K_C15, type code %, sha256 e6d765540ed2fd20…

48: PHASE BI2K_C15 % 2 2 1 !
49: CONST BI2K_C15 : BI : K : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

BI2K3 (Bi–K)

Id: phase:bi-k:bi2k3; status assigned
Structure: Eu3Ga2 · mC20 · C2/c (15); type st:eu3ga2-mc20; 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: Bi 0.4000, K 0.6000
Stability: stable in 3 of 3 calculated diagram(s): 300–720 K, x(K) 0.6–0.6
Literature: 17 values (17 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-k:bi2k3
paper: paper:10.1016/j.tca.2011.10.032:Bi2K3
tdb: tdb:BiK-12Niu.tdb:BI2K3, tdb:BiK-15Gie.tdb:BI2K3, tdb:BiK-80Che-LB.tdb:BI2K3

TDB models of BI2K3 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: BI2K3, type code %, sha256 3ce72b86413e842a…

60: PHASE BI2K3 % 2 2 3 !
61: CONST BI2K3 : BI : K : !

BiK-15Gie.tdb: BI2K3, type code %, sha256 530ca2f96b764f0e…

64: PHASE BI2K3 % 2 2 3 !
65: CONST BI2K3 : BI : K : !

BiK-80Che-LB.tdb: BI2K3, type code %, sha256 e6d765540ed2fd20…

58: PHASE BI2K3 % 2 2 3 !
59: CONST BI2K3 : BI : K : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

BI4K5 (Bi–K)

Id: phase:bi-k:bi4k5; status assigned
Structure: Bi4K5 · mC18 · C2/m (12); type st:bi4k5-mc18; 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: Bi 0.4444, K 0.5556
Stability: stable in 3 of 3 calculated diagram(s): 300–656.4 K, x(K) 0.55556–0.55556
Literature: 21 values (21 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-k:bi4k5
paper: paper:10.1016/j.tca.2011.10.032:Bi4K5
tdb: tdb:BiK-12Niu.tdb:BI4K5, tdb:BiK-15Gie.tdb:BI4K5, tdb:BiK-80Che-LB.tdb:BI4K5

TDB models of BI4K5 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: BI4K5, type code %, sha256 3ce72b86413e842a…

55: PHASE BI4K5 % 2 4 5 !
56: CONST BI4K5 : BI : K : !

BiK-15Gie.tdb: BI4K5, type code %, sha256 530ca2f96b764f0e…

59: PHASE BI4K5 % 2 4 5 !
60: CONST BI4K5 : BI : K : !

BiK-80Che-LB.tdb: BI4K5, type code %, sha256 e6d765540ed2fd20…

53: PHASE BI4K5 % 2 4 5 !
54: CONST BI4K5 : BI : K : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

BIK3_D021 (Bi–K)

Id: phase:bi-k:bik3-d021; status assigned
Structure: Cu3P · D0_21 · hP24 · P6_3cm (185); type st:d0-21-cu3p-hp24; tier A: standard phase name; confidence high
Stoichiometry: Bi 0.2500, K 0.7500
Stability: stable in 3 of 3 calculated diagram(s): 300–555.33 K, x(K) 0.75–0.75
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-k:bik3-d021
paper: paper:10.1016/j.tca.2011.10.032:α-BiK3
tdb: tdb:BiK-12Niu.tdb:BIK3_D021, tdb:BiK-15Gie.tdb:BIK3_D021, tdb:BiK-80Che-LB.tdb:BIK3_D021

TDB models of BIK3_D021 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: BIK3_D021, type code %, sha256 3ce72b86413e842a…

65: PHASE BIK3_D021 % 2 1 3 !
66: CONST BIK3_D021 : BI : K : !

BiK-15Gie.tdb: BIK3_D021, type code %, sha256 530ca2f96b764f0e…

69: PHASE BIK3_D021 % 2 1 3 !
70: CONST BIK3_D021 : BI : K : !

BiK-80Che-LB.tdb: BIK3_D021, type code %, sha256 e6d765540ed2fd20…

63: PHASE BIK3_D021 % 2 1 3 !
64: CONST BIK3_D021 : BI : K : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

BIK3_D03 (Bi–K)

Id: phase:bi-k:bik3-d03; status assigned
Structure: BiF3 · D0_3 · cF16 · Fm-3m (225); type st:d0-3-bif3-cf16; tier A: standard phase name; confidence high
Stoichiometry: Bi 0.2500, K 0.7500
Stability: stable in 3 of 3 calculated diagram(s): 553–990 K, x(K) 0.75–0.75
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-k:bik3-d03
paper: paper:10.1016/j.tca.2011.10.032:β-BiK3
tdb: tdb:BiK-12Niu.tdb:BIK3_D03, tdb:BiK-15Gie.tdb:BIK3_D03, tdb:BiK-80Che-LB.tdb:BIK3_D03

TDB models of BIK3_D03 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: BIK3_D03, type code %, sha256 3ce72b86413e842a…

70: PHASE BIK3_D03 % 2 1 3 !
71: CONST BIK3_D03 : BI : K : !

BiK-15Gie.tdb: BIK3_D03, type code %, sha256 530ca2f96b764f0e…

74: PHASE BIK3_D03 % 2 1 3 !
75: CONST BIK3_D03 : BI : K : !

BiK-80Che-LB.tdb: BIK3_D03, type code %, sha256 e6d765540ed2fd20…

68: PHASE BIK3_D03 % 2 1 3 !
69: CONST BIK3_D03 : BI : K : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
cited as the source of values for this phase

FCC_A1 (Bi–K)

Id: phase:bi-k:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: not stable in 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:bi-k:fcc-a1
tdb: tdb:BiK-12Niu.tdb:FCC_A1, tdb:BiK-15Gie.tdb:FCC_A1, tdb:BiK-80Che-LB.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: FCC_A1, type code %A, sha256 3ce72b86413e842a…

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

BiK-15Gie.tdb: FCC_A1, type code %A, sha256 530ca2f96b764f0e…

34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : BI K : VA : !

BiK-80Che-LB.tdb: FCC_A1, type code %A, sha256 e6d765540ed2fd20…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : BI K : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase

HCP_A3 (Bi–K)

Id: phase:bi-k: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: not stable in 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:bi-k:hcp-a3
tdb: tdb:BiK-12Niu.tdb:HCP_A3, tdb:BiK-15Gie.tdb:HCP_A3, tdb:BiK-80Che-LB.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: HCP_A3, type code %A, sha256 3ce72b86413e842a…

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

BiK-15Gie.tdb: HCP_A3, type code %A, sha256 530ca2f96b764f0e…

44: PHASE HCP_A3 %A 2 1 0.5 !
45: CONST HCP_A3 : BI K : VA: !

BiK-80Che-LB.tdb: HCP_A3, type code %A, sha256 e6d765540ed2fd20…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : BI K : VA: !

Example references (2 of 2; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase

LIQUID (Bi–K)

Id: phase:bi-k:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 336.32–2500 K, x(K) 0–1
Literature: 29 values (29 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-k:liquid
paper: paper:10.1016/j.tca.2011.10.032:L
tdb: tdb:BiK-12Niu.tdb:LIQUID, tdb:BiK-15Gie.tdb:LIQUID, tdb:BiK-80Che-LB.tdb:LIQUID

TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written

BiK-12Niu.tdb: LIQUID, type code %, sha256 3ce72b86413e842a…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : BI BIK BIK3 K : !

BiK-15Gie.tdb: LIQUID, type code %, sha256 530ca2f96b764f0e…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : BI BIK3 K : !

BiK-80Che-LB.tdb: LIQUID, type code %, sha256 e6d765540ed2fd20…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : BI K : !

Example references (5 of 5; assessments first):

doi:10.1016/j.tca.2011.10.032 Chunju Niu, Changrong Li, Zhenmin Du, Cuiping Guo, Miao Liu, Thermodynamic assessment of the Bi–K binary system, Thermochimica Acta 528, 9-14 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.tca.2014.12.006 W. Gierlotka, Thermochim. Acta, 604, 137-39(2015).
assessment that models this phase
doi:10.1007/bf02663669 A. Petric, A.D. Pelton, The Bi–K (bismuth–potassium) system, J. Phase Equilib. 12 (1) (1991) 29–33.
cited as the source of values for this phase
doi:10.1002/zaac.19613090305 Geert Gnutzmann, Wilhelm Klemm, Das Verhalten der Alkalimetalle zu Halbmetallen. IV. Die Systeme des Kaliums, Rubidiums und Caesiums mit Wismut, Zeitschrift anorg allge chemie 309, 181-188 (1961).
cited as the source of values for this phase
doi:10.1088/0305-4608/18/7/015 A Petric, A D Pelton, M L Saboungi, Thermodynamic properties of liquid K-Bi alloys by electromotive force measurements, J. Phys. F: Met. Phys. 18, 1473-1489 (1988).
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}
}