Sc–Si phases
10 phases (tier A 6, liquid 1, needs_review 3); 9 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 · Sc–Si system page · Markdown · field reference
| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---|---|
| DIAMOND_A4 phase:sc-si:a4-diamond | C (diamond) · A4 · cF8 · Fd-3m (227) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–2499.32 K, x(Si) 1–1 | 4 | 2 |
| BCC_A2 phase:sc-si:bcc-a2 | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 1607.95–1832.95 K, x(Si) 0–3e-05 | 0 | 2 |
| FCC_A1 phase:sc-si:fcc-a1 | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 0 | 2 |
| HCP_A3 phase:sc-si:hcp-a3 | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1702.99 K, x(Si) 0–2e-05 | 2 | 2 |
| LIQUID phase:sc-si:liquid | liquid | liquid | stable in 2 of 2 calculated diagram(s): 1424.57–2500 K, x(Si) 0–1 | 10 | 2 |
| SC2SI3_C32 phase:sc-si:sc2si3-c32 | needs_review | stable in 1 of 1 calculated diagram(s): 1196.56–1534.9 K, x(Si) 0.6–0.6 | 0 | 1 | |
| BETA_SC3SI5 phase:sc-si:sc3si5-beta | needs_review | stable in 1 of 1 calculated diagram(s): 1342.73–1536.12 K, x(Si) 0.625–0.625 | 6 | 1 | |
| ALPHA_SC3SI5_C32 phase:sc-si:sc3si5-c32-alpha | needs_review | stable in 1 of 1 calculated diagram(s): 1198.66–1342.73 K, x(Si) 0.625–0.625 | 6 | 1 | |
| SC5SI3_D88 phase:sc-si:sc5si3-d88 | Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–2333.6 K, x(Si) 0.375–0.375 | 11 | 2 |
| SCSI_B33 phase:sc-si:scsi-b33 | CrB · B33 · oC8 · Cmcm (63) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–2056.92 K, x(Si) 0.5–0.5 | 11 | 2 |
DIAMOND_A4 (Sc–Si)
- Id:
phase:sc-si:a4-diamond; statusassigned - Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type
st:a4-c-diamond-cf8; tier A: standard phase name; confidence high - Stoichiometry: Si 1.0000
- Stability: stable in 2 of 2 calculated diagram(s): 300–2499.32 K, x(Si) 1–1
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: phase registry entry
Names (5): corpus: corpus:phase:sc-si:a4-diamond, corpus:phase:sc-si:diamond-a4
paper: paper:10.1007/s10973-014-4216-2:(Si)
tdb: tdb:ScSi-08GTT.tdb:DIAMOND_A4, tdb:ScSi-15Qin.tdb:DIAMOND_A4
TDB models of DIAMOND_A4 (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: DIAMOND_A4, type code %, sha256 39f96fbdf0474901…
40: PHASE DIAMOND_A4 % 1 1 ! 41: CONST DIAMOND_A4 : SI : !
ScSi-15Qin.tdb: DIAMOND_A4, type code %, sha256 e29b1390094334c4…
41: PHASE DIAMOND_A4 % 1 1 ! 42: CONST DIAMOND_A4 : SI : !
Example references (2 of 2; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase
BCC_A2 (Sc–Si)
- Id:
phase:sc-si:bcc-a2; statusassigned - 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): 1607.95–1832.95 K, x(Si) 0–3e-05
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: phase registry entry
Names (3): corpus: corpus:phase:sc-si:bcc-a2
tdb: tdb:ScSi-08GTT.tdb:BCC_A2, tdb:ScSi-15Qin.tdb:BCC_A2
TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: BCC_A2, type code %, sha256 39f96fbdf0474901…
30: PHASE BCC_A2 % 2 1 3 ! 31: CONST BCC_A2 : SC% SI : VA : !
ScSi-15Qin.tdb: BCC_A2, type code %, sha256 e29b1390094334c4…
31: PHASE BCC_A2 % 2 1 3 ! 32: CONST BCC_A2 : SC% SI : VA : !
Example references (1 of 1; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase
FCC_A1 (Sc–Si)
- Id:
phase:sc-si:fcc-a1; statusassigned - Structure: Cu · A1 · cF4 · Fm-3m (225); type
st:a1-cu-cf4; tier A: standard phase name; confidence high - Stability: not stable in 2 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: phase registry entry
Names (3): corpus: corpus:phase:sc-si:fcc-a1
tdb: tdb:ScSi-08GTT.tdb:FCC_A1, tdb:ScSi-15Qin.tdb:FCC_A1
TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: FCC_A1, type code %, sha256 39f96fbdf0474901…
25: PHASE FCC_A1 % 2 1 1 ! 26: CONST FCC_A1 : SC SI : VA : !
ScSi-15Qin.tdb: FCC_A1, type code %, sha256 e29b1390094334c4…
26: PHASE FCC_A1 % 2 1 1 ! 27: CONST FCC_A1 : SC SI : VA : !
Example references (1 of 1; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase
HCP_A3 (Sc–Si)
- Id:
phase:sc-si:hcp-a3; statusassigned - 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): 300–1702.99 K, x(Si) 0–2e-05
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: phase registry entry
Names (4): corpus: corpus:phase:sc-si:hcp-a3
paper: paper:10.1007/s10973-014-4216-2:(αSc)
tdb: tdb:ScSi-08GTT.tdb:HCP_A3, tdb:ScSi-15Qin.tdb:HCP_A3
TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: HCP_A3, type code %, sha256 39f96fbdf0474901…
35: PHASE HCP_A3 % 2 1 0.5 ! 36: CONST HCP_A3 : SC% SI : VA : !
ScSi-15Qin.tdb: HCP_A3, type code %, sha256 e29b1390094334c4…
36: PHASE HCP_A3 % 2 1 0.5 ! 37: CONST HCP_A3 : SC% SI : VA : !
Example references (2 of 2; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase
LIQUID (Sc–Si)
- Id:
phase:sc-si:liquid; statusassigned - Structure: liquid; type
st:liquid; liquid; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 1424.57–2500 K, x(Si) 0–1
- Literature: 10 values (10 accepted) from 1 papers
- Interactive: phase registry entry
Names (4): corpus: corpus:phase:sc-si:liquid
paper: paper:10.1007/s10973-014-4216-2:L
tdb: tdb:ScSi-08GTT.tdb:LIQUID, tdb:ScSi-15Qin.tdb:LIQUID
TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: LIQUID, type code %, sha256 39f96fbdf0474901…
20: PHASE LIQUID:L % 1 1 ! 21: CONST LIQUID:L : SC SI : !
ScSi-15Qin.tdb: LIQUID, type code %, sha256 e29b1390094334c4…
21: PHASE LIQUID:L % 1 1 ! 22: CONST LIQUID:L : SC SI : !
Example references (2 of 2; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase
SC2SI3_C32 (Sc–Si)
- Id:
phase:sc-si:sc2si3-c32; statusneeds_review - No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C32; stoichiometry_contradicts_C32:ScSi-08GTT.tdb
- Candidate (name_token): AlB2 · C32 · hP3 · P6/mmm (191) — Strukturbericht/word 'C32' in the TDB name
- Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for SC2SI3_C32: Sc2Si3
- Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — ScSi-08GTT.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
- Stoichiometry: Sc 0.4000, Si 0.6000
- Stability: stable in 1 of 1 calculated diagram(s): 1196.56–1534.9 K, x(Si) 0.6–0.6
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: phase registry entry
Names (2): corpus: corpus:phase:sc-si:sc2si3-c32
tdb: tdb:ScSi-08GTT.tdb:SC2SI3_C32
TDB models of SC2SI3_C32 (1): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: SC2SI3_C32, type code %, sha256 39f96fbdf0474901…
55: PHASE SC2SI3_C32 % 2 2 3 ! 56: CONST SC2SI3_C32 : SC : SI : !
BETA_SC3SI5 (Sc–Si)
- Id:
phase:sc-si:sc3si5-beta; statusneeds_review - No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (beta-Sc3Si5) — Hallstedt 2025 mmc2 row for BETA_SC3SI5: beta-Sc3Si5
- Stoichiometry: Sc 0.3750, Si 0.6250
- Stability: stable in 1 of 1 calculated diagram(s): 1342.73–1536.12 K, x(Si) 0.625–0.625
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: phase registry entry
Names (5): corpus: corpus:phase:sc-si:sc3si5-beta, corpus:phase:sc-si:beta-sc3si5
paper: paper:10.1007/s10973-014-4216-2:(βSc3Si5), paper:10.1007/s10973-014-4216-2:βSc3Si5
tdb: tdb:ScSi-15Qin.tdb:BETA_SC3SI5
TDB models of BETA_SC3SI5 (1): PHASE and CONSTITUENT statements as written
ScSi-15Qin.tdb: BETA_SC3SI5, type code %, sha256 e29b1390094334c4…
61: PHASE BETA_SC3SI5 % 2 3 5 ! 62: CONST BETA_SC3SI5 : SC : SI : !
Example references (2 of 2; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase
ALPHA_SC3SI5_C32 (Sc–Si)
- Id:
phase:sc-si:sc3si5-c32-alpha; statusneeds_review - No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C32; stoichiometry_contradicts_C32:ScSi-15Qin.tdb
- Candidate (name_token): AlB2 · C32 · hP3 · P6/mmm (191) — Strukturbericht/word 'C32' in the TDB name
- Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for ALPHA_SC3SI5_C32: alpha-Sc3Si5
- Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — ScSi-15Qin.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
- Stoichiometry: Sc 0.3750, Si 0.6250
- Stability: stable in 1 of 1 calculated diagram(s): 1198.66–1342.73 K, x(Si) 0.625–0.625
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: phase registry entry
Names (4): corpus: corpus:phase:sc-si:sc3si5-c32-alpha, corpus:phase:sc-si:alpha-sc3si5-c32
paper: paper:10.1007/s10973-014-4216-2:αSc3Si5
tdb: tdb:ScSi-15Qin.tdb:ALPHA_SC3SI5_C32
TDB models of ALPHA_SC3SI5_C32 (1): PHASE and CONSTITUENT statements as written
ScSi-15Qin.tdb: ALPHA_SC3SI5_C32, type code %, sha256 e29b1390094334c4…
56: PHASE ALPHA_SC3SI5_C32 % 2 3 5 ! 57: CONST ALPHA_SC3SI5_C32 : SC : SI : !
Example references (2 of 2; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase
SC5SI3_D88 (Sc–Si)
- Id:
phase:sc-si:sc5si3-d88; statusassigned - Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type
st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaalow and oqmd-4475, space group 193
- Stoichiometry: Sc 0.6250, Si 0.3750
- Stability: stable in 2 of 2 calculated diagram(s): 300–2333.6 K, x(Si) 0.375–0.375
- Literature: 11 values (11 accepted) from 1 papers
- Interactive: phase registry entry
Names (6): corpus: corpus:phase:sc-si:sc5si3-d88
mp: mp:mp-aaaaalow
oqmd: oqmd:oqmd-4475
paper: paper:10.1007/s10973-014-4216-2:Sc5Si3
tdb: tdb:ScSi-08GTT.tdb:SC5SI3_D88, tdb:ScSi-15Qin.tdb:SC5SI3_D88
TDB models of SC5SI3_D88 (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: SC5SI3_D88, type code %, sha256 39f96fbdf0474901…
45: PHASE SC5SI3_D88 % 2 5 3 ! 46: CONST SC5SI3_D88 : SC : SI : !
ScSi-15Qin.tdb: SC5SI3_D88, type code %, sha256 e29b1390094334c4…
46: PHASE SC5SI3_D88 % 2 5 3 ! 47: CONST SC5SI3_D88 : SC : SI : !
Example references (4 of 4; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase - doi:10.1007/bf02670193 Letitia Topor, O. J. Kleppa, Standard enthalpy of formation of Sc5Si3, Metall Trans B 20, 879-882 (1989).
cited as the source of values for this phase - doi:10.1016/0925-8388(92)90229-3 G.M Lukashenko, R.I Polotskaya, V.R Sidorko, Thermodynamic properties of scandium, lanthanum, neodymium and gadolinium silicides and germanides, Journal of Alloys and Compounds 179, 299-305 (1992).
cited as the source of values for this phase
SCSI_B33 (Sc–Si)
- Id:
phase:sc-si:scsi-b33; statusassigned - Structure: CrB · B33 · oC8 · Cmcm (63); type
st:b33-crb-oc8; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaaotl and oqmd-7936, space group 63
- Stoichiometry: Sc 0.5000, Si 0.5000
- Stability: stable in 2 of 2 calculated diagram(s): 300–2056.92 K, x(Si) 0.5–0.5
- Literature: 11 values (11 accepted) from 1 papers
- Interactive: phase registry entry
Names (6): corpus: corpus:phase:sc-si:scsi-b33
mp: mp:mp-aaaaaotl
oqmd: oqmd:oqmd-7936
paper: paper:10.1007/s10973-014-4216-2:ScSi
tdb: tdb:ScSi-08GTT.tdb:SCSI_B33, tdb:ScSi-15Qin.tdb:SCSI_B33
TDB models of SCSI_B33 (2): PHASE and CONSTITUENT statements as written
ScSi-08GTT.tdb: SCSI_B33, type code %, sha256 39f96fbdf0474901…
50: PHASE SCSI_B33 % 2 1 1 ! 51: CONST SCSI_B33 : SC : SI : !
ScSi-15Qin.tdb: SCSI_B33, type code %, sha256 e29b1390094334c4…
51: PHASE SCSI_B33 % 2 1 1 ! 52: CONST SCSI_B33 : SC : SI : !
Example references (4 of 4; assessments first):
- doi:10.1007/s10973-014-4216-2 Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015).
assessment that models this phase; reports values for this phase - doi:10.1007/bf00794560 V. N. Eremenko, K. A. Meleshevich, Yu. I. Buyanov, P. S. Martsenyuk, Phase equilibria in the scandium-silicon system, Powder Metall Met Ceram 27, 967-972 (1988).
cited as the source of values for this phase - doi:10.1016/0925-8388(92)90229-3 G.M Lukashenko, R.I Polotskaya, V.R Sidorko, Thermodynamic properties of scandium, lanthanum, neodymium and gadolinium silicides and germanides, Journal of Alloys and Compounds 179, 299-305 (1992).
cited as the source of values for this phase - doi:10.1016/s0925-8388(97)00528-8 S.V Meschel, O.J Kleppa, Standard enthalpies of formation of some 3d transition metal silicides by high temperature direct synthesis calorimetry, Journal of Alloys and Compounds 267, 128-135 (1998).
cited as the source of values for this phase