# La–Si phases > La–Si system: 13 phases (tier A 8, tier C 2, liquid 1, needs_review 2); 12 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references. HTML: https://data.orchid-project.org/phases/pages/LA-SI.html · Markdown: https://data.orchid-project.org/phases/pages/LA-SI.md 13 phases (tier A 8, tier C 2, liquid 1, needs_review 2); 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](https://orchid-project.org/phases/?q=LA-SI) · [full JSON](https://data.orchid-project.org/phases/systems/LA-SI.json) · [La–Si system page](https://data.orchid-project.org/systems/LA-SI.html) · [Markdown](https://data.orchid-project.org/phases/pages/LA-SI.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the La–Si system (13) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [DIAMOND_A4](#phase-la-si-a4-diamond); _phase:la-si:a4-diamond_ | C (diamond) · A4 · cF8 · Fd-3m (227) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–2357.2 K, x(Si) 1–1 | 2 | 2 | | [BCC_A2](#phase-la-si-bcc-a2); _phase:la-si:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 1088.11–1190 K, x(Si) 0–0.01328 | 2 | 2 | | [DHCP](#phase-la-si-dhcp-a3); _phase:la-si:dhcp-a3_ | alpha-La · A3' · hP4 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–823.85 K, x(Si) 0–0 | 1 | 2 | | [FCC_A1](#phase-la-si-fcc-a1); _phase:la-si:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 539.53–1134 K, x(Si) 0–0.01005 | 5 | 2 | | [HCP_A3](#phase-la-si-hcp-a3); _phase:la-si:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 0 | 2 | | [LA3SI2_D5A](#phase-la-si-la3si2-d5a); _phase:la-si:la3si2-d5a_ | Si2U3 · D5_a · tP10 · P4/mbm (127) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1743.16 K, x(Si) 0.4–0.4 | 4 | 2 | | [LA3SI5](#phase-la-si-la3si5); _phase:la-si:la3si5_ | GdSi1.4 · oI12 · Imma (74) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–2002.6 K, x(Si) 0.625–0.625 | 0 | 1 | | [LA5SI3_D8L](#phase-la-si-la5si3-d8l); _phase:la-si:la5si3-d8l_ | Cr5B3 · D8_l · tI32 · I4/mcm (140) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1540.34 K, x(Si) 0.375–0.375 | 5 | 2 | | [LA5SI4](#phase-la-si-la5si4); _phase:la-si:la5si4_ | Si4Zr5 · tP36 · P4_12_12 (92) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–1833.91 K, x(Si) 0.44444–0.44444 | 11 | 2 | | [LASI_B27](#phase-la-si-lasi-b27); _phase:la-si:lasi-b27_ | | needs_review | stable in 2 of 2 calculated diagram(s): 300–1899.4 K, x(Si) 0.5–0.5 | 6 | 2 | | [LASI2_CC](#phase-la-si-lasi2-cc); _phase:la-si:lasi2-cc_ | Si2Th · C_c · tI12 · I4_1/amd (141) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1872.04 K, x(Si) 0.66667–0.66667 | 0 | 2 | | [LASI2_X](#phase-la-si-lasi2-x); _phase:la-si:lasi2-x_ | | needs_review | stable in 1 of 1 calculated diagram(s): 300–2000.18 K, x(Si) 0.64–0.64 | 0 | 1 | | [LIQUID](#phase-la-si-liquid); _phase:la-si:liquid_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 995.22–2500 K, x(Si) 0–1 | 20 | 2 | ## DIAMOND_A4 (La–Si) - Id: `phase:la-si:a4-diamond`; status `assigned` - 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): 300–2357.2 K, x(Si) 1–1 - Literature: 2 values (2 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:a4-diamond) Names (4): _corpus: _corpus:phase:la-si:a4-diamond _paper: _paper:10.1016/j.jallcom.2009.09.171:Diamond(Si) _tdb: _tdb:LaSi-10Zho.tdb:DIAMOND_A4, tdb:LaSi-20Xu.tdb:DIAMOND_A4 ### TDB models of DIAMOND_A4 (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): DIAMOND_A4, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 46: PHASE DIAMOND_A4 % 1 1 ! 47: CONST DIAMOND_A4 : SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): DIAMOND_A4, type code %, sha256 `63d465a532cafc3b…` ~~~~text 45: PHASE DIAMOND_A4 % 1 1 ! 46: CONST DIAMOND_A4 : SI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## BCC_A2 (La–Si) - Id: `phase:la-si: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 2 of 2 calculated diagram(s): 1088.11–1190 K, x(Si) 0–0.01328 - Literature: 2 values (2 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:bcc-a2) Names (4): _corpus: _corpus:phase:la-si:bcc-a2 _paper: _paper:10.1016/j.jallcom.2009.09.171:BCC _tdb: _tdb:LaSi-10Zho.tdb:BCC_A2, tdb:LaSi-20Xu.tdb:BCC_A2 ### TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): BCC_A2, type code %B, sha256 `40aef7ee33d576b9…` ~~~~text 31: PHASE BCC_A2 %B 2 1 3 ! 32: CONST BCC_A2 : LA% SI : VA : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): BCC_A2, type code %B, sha256 `63d465a532cafc3b…` ~~~~text 30: PHASE BCC_A2 %B 2 1 3 ! 31: CONST BCC_A2 : LA% SI : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## DHCP (La–Si) - Id: `phase:la-si:dhcp-a3`; status `assigned` - Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type `st:a3-alpha-la-hp4`; tier A: standard phase name; confidence high - Stoichiometry: La 1.0000 - Stability: stable in 2 of 2 calculated diagram(s): 300–823.85 K, x(Si) 0–0 - Literature: 1 values (1 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:dhcp-a3) Names (4): _corpus: _corpus:phase:la-si:dhcp-a3 _paper: _paper:10.1016/j.jallcom.2009.09.171:DHCP _tdb: _tdb:LaSi-10Zho.tdb:DHCP, tdb:LaSi-20Xu.tdb:DHCP ### TDB models of DHCP (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): DHCP, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 41: PHASE DHCP % 1 1 ! 42: CONST DHCP : LA : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): DHCP, type code %, sha256 `63d465a532cafc3b…` ~~~~text 40: PHASE DHCP % 1 1 ! 41: CONST DHCP : LA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ ## FCC_A1 (La–Si) - Id: `phase:la-si: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 2 of 2 calculated diagram(s): 539.53–1134 K, x(Si) 0–0.01005 - Literature: 5 values (5 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:fcc-a1) Names (4): _corpus: _corpus:phase:la-si:fcc-a1 _paper: _paper:10.1016/j.jallcom.2009.09.171:FCC _tdb: _tdb:LaSi-10Zho.tdb:FCC_A1, tdb:LaSi-20Xu.tdb:FCC_A1 ### TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): FCC_A1, type code %A, sha256 `40aef7ee33d576b9…` ~~~~text 26: PHASE FCC_A1 %A 2 1 1 ! 27: CONST FCC_A1 : LA% SI : VA : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): FCC_A1, type code %A, sha256 `63d465a532cafc3b…` ~~~~text 25: PHASE FCC_A1 %A 2 1 1 ! 26: CONST FCC_A1 : LA% SI : VA : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## HCP_A3 (La–Si) - Id: `phase:la-si: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: Si 1.0000 - Stability: not stable in 2 calculated diagram(s) - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:hcp-a3) Names (3): _corpus: _corpus:phase:la-si:hcp-a3 _tdb: _tdb:LaSi-10Zho.tdb:HCP_A3, tdb:LaSi-20Xu.tdb:HCP_A3 ### TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): HCP_A3, type code %A, sha256 `40aef7ee33d576b9…` ~~~~text 36: PHASE HCP_A3 %A 2 1 0.5 ! 37: CONST HCP_A3 : SI : VA : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): HCP_A3, type code %A, sha256 `63d465a532cafc3b…` ~~~~text 35: PHASE HCP_A3 %A 2 1 0.5 ! 36: CONST HCP_A3 : SI : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ ## LA3SI2_D5A (La–Si) - Id: `phase:la-si:la3si2-d5a`; status `assigned` - Structure: Si2U3 · D5_a · tP10 · P4/mbm (127); type `st:d5-a-si2u3-tp10`; tier A: standard phase name; confidence high - Stoichiometry: La 0.6000, Si 0.4000 - Stability: stable in 2 of 2 calculated diagram(s): 300–1743.16 K, x(Si) 0.4–0.4 - Literature: 4 values (4 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:la3si2-d5a) Names (4): _corpus: _corpus:phase:la-si:la3si2-d5a _paper: _paper:10.1016/j.jallcom.2009.09.171:La3Si2 _tdb: _tdb:LaSi-10Zho.tdb:LA3SI2_D5A, tdb:LaSi-20Xu.tdb:LA3SI2_D5A ### TDB models of LA3SI2_D5A (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LA3SI2_D5A, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 56: PHASE LA3SI2_D5A % 2 3 2 ! 57: CONST LA3SI2_D5A : LA : SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LA3SI2_D5A, type code %, sha256 `63d465a532cafc3b…` ~~~~text 55: PHASE LA3SI2_D5A % 2 3 2 ! 56: CONST LA3SI2_D5A : LA : SI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## LA3SI5 (La–Si) - Id: `phase:la-si:la3si5`; status `assigned` - Structure: GdSi1.4 · oI12 · Imma (74); type `st:gdsi1-4-oi12`; 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](https://doi.org/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: La 0.3750, Si 0.6250 - Stability: stable in 1 of 1 calculated diagram(s): 300–2002.6 K, x(Si) 0.625–0.625 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:la3si5) Names (2): _corpus: _corpus:phase:la-si:la3si5 _tdb: _tdb:LaSi-20Xu.tdb:LA3SI5 ### TDB models of LA3SI5 (1): PHASE and CONSTITUENT statements as written [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LA3SI5, type code %, sha256 `63d465a532cafc3b…` ~~~~text 70: PHASE LA3SI5 % 2 3 5 ! 71: CONST LA3SI5 : LA : SI : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ ## LA5SI3_D8L (La–Si) - Id: `phase:la-si:la5si3-d8l`; status `assigned` - Structure: Cr5B3 · D8_l · tI32 · I4/mcm (140); type `st:d8-l-cr5b3-ti32`; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaaqfp and oqmd-16378, space group 140 - Stoichiometry: La 0.6250, Si 0.3750 - Stability: stable in 2 of 2 calculated diagram(s): 300–1540.34 K, x(Si) 0.375–0.375 - Literature: 5 values (5 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:la5si3-d8l) Names (6): _corpus: _corpus:phase:la-si:la5si3-d8l _mp: _mp:mp-aaaaaqfp _oqmd: _oqmd:oqmd-16378 _paper: _paper:10.1016/j.jallcom.2009.09.171:La5Si3 _tdb: _tdb:LaSi-10Zho.tdb:LA5SI3_D8L, tdb:LaSi-20Xu.tdb:LA5SI3_D8L ### TDB models of LA5SI3_D8L (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LA5SI3_D8L, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 51: PHASE LA5SI3_D8L % 2 5 3 ! 52: CONST LA5SI3_D8L : LA : SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LA5SI3_D8L, type code %, sha256 `63d465a532cafc3b…` ~~~~text 50: PHASE LA5SI3_D8L % 2 5 3 ! 51: CONST LA5SI3_D8L : LA : SI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## LA5SI4 (La–Si) - Id: `phase:la-si:la5si4`; status `assigned` - Structure: Si4Zr5 · tP36 · P4_12_12 (92); type `st:si4zr5-tp36`; 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](https://doi.org/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: La 0.5556, Si 0.4444 - Stability: stable in 2 of 2 calculated diagram(s): 300–1833.91 K, x(Si) 0.44444–0.44444 - Literature: 11 values (11 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:la5si4) Names (5): _corpus: _corpus:phase:la-si:la5si4 _paper: _paper:10.1016/j.jallcom.2009.09.171:La5Si4, paper:10.1111/jace.17031:La5Si4 _tdb: _tdb:LaSi-10Zho.tdb:LA5SI4, tdb:LaSi-20Xu.tdb:LA5SI4 ### TDB models of LA5SI4 (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LA5SI4, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 61: PHASE LA5SI4 % 2 5 4 ! 62: CONST LA5SI4 : LA : SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LA5SI4, type code %, sha256 `63d465a532cafc3b…` ~~~~text 60: PHASE LA5SI4 % 2 5 4 ! 61: CONST LA5SI4 : LA : SI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## LASI_B27 (La–Si) - Id: `phase:la-si:lasi-b27`; status `needs_review` - No structure assigned. Why: assessment_declared_blocked_by:name_suggests_B27_but_dft_space_group_63; name_suggests_B27_but_dft_space_group_63 - Candidate (dft_mp): Cmcm (63) — on-hull MP LaSi at x(SI)=0.5000 - Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD La1 Si1 at x(SI)=0.5000 - Candidate (literature_printed): FeB · oP8 — printed with a label mapped to this phase - Candidate (name_token): FeB · B27 · oP8 · Pnma (62) — Strukturbericht/word 'B27' in the TDB name - Candidate (sgte_mmc2): FeB · B27 · oP8 · Pnma (62) — Hallstedt 2025 mmc2 row for LASI_B27: LaSi - Candidate (tdb_comment): FeB · oP8 · Pnma — LaSi-10Zho.tdb: 'Prototype FeB (oP8, Pnma)' - Candidate (tdb_comment): FeB · oP8 · Pnma — LaSi-20Xu.tdb: 'Prototype FeB (oP8, Pnma)' - Stoichiometry: La 0.5000, Si 0.5000 - Stability: stable in 2 of 2 calculated diagram(s): 300–1899.4 K, x(Si) 0.5–0.5 - Literature: 6 values (6 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:lasi-b27) Names (4): _corpus: _corpus:phase:la-si:lasi-b27 _paper: _paper:10.1016/j.jallcom.2009.09.171:LaSi _tdb: _tdb:LaSi-10Zho.tdb:LASI_B27, tdb:LaSi-20Xu.tdb:LASI_B27 ### TDB models of LASI_B27 (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LASI_B27, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 66: PHASE LASI_B27 % 2 1 1 ! 67: CONST LASI_B27 : LA : SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LASI_B27, type code %, sha256 `63d465a532cafc3b…` ~~~~text 65: PHASE LASI_B27 % 2 1 1 ! 66: CONST LASI_B27 : LA : SI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _cited as the source of values for this phase_ ## LASI2_CC (La–Si) - Id: `phase:la-si:lasi2-cc`; status `assigned` - Structure: Si2Th · C_c · tI12 · I4_1/amd (141); type `st:c-c-si2th-ti12`; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaadbi and oqmd-14081, space group 141 - Stoichiometry: La 0.3333, Si 0.6667 - Stability: stable in 2 of 2 calculated diagram(s): 300–1872.04 K, x(Si) 0.66667–0.66667 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:lasi2-cc) Names (5): _corpus: _corpus:phase:la-si:lasi2-cc _mp: _mp:mp-aaaaadbi _oqmd: _oqmd:oqmd-14081 _tdb: _tdb:LaSi-10Zho.tdb:LASI2_CC, tdb:LaSi-20Xu.tdb:LASI2_CC ### TDB models of LASI2_CC (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LASI2_CC, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 76: PHASE LASI2_CC % 2 1 2 ! 77: CONST LASI2_CC : LA : SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LASI2_CC, type code %, sha256 `63d465a532cafc3b…` ~~~~text 75: PHASE LASI2_CC % 2 1 2 ! 76: CONST LASI2_CC : LA : SI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ ## LASI2_X (La–Si) - Id: `phase:la-si:lasi2-x`; status `needs_review` - No structure assigned. Why: name_has_descriptive_tokens:X; no_structure_token - Candidate (sgte_mmc2): GdSi1.4 · oI12 · Imma (74) — Hallstedt 2025 mmc2 row for LASI2_X: LaSi2-x - Candidate (tdb_comment): GdSi1.4 · oI12 · Imma — LaSi-10Zho.tdb: 'Prototype GdSi1.4 (oI12, Imma)' - Stoichiometry: La 0.3600, Si 0.6400 - Stability: stable in 1 of 1 calculated diagram(s): 300–2000.18 K, x(Si) 0.64–0.64 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:lasi2-x) Names (2): _corpus: _corpus:phase:la-si:lasi2-x _tdb: _tdb:LaSi-10Zho.tdb:LASI2_X ### TDB models of LASI2_X (1): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LASI2_X, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 71: PHASE LASI2_X % 2 0.36 0.64 ! 72: CONST LASI2_X : LA : SI : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase_ ## LIQUID (La–Si) - Id: `phase:la-si:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 995.22–2500 K, x(Si) 0–1 - Literature: 20 values (20 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:la-si:liquid) Names (4): _corpus: _corpus:phase:la-si:liquid _paper: _paper:10.1016/j.jallcom.2009.09.171:L _tdb: _tdb:LaSi-10Zho.tdb:LIQUID, tdb:LaSi-20Xu.tdb:LIQUID ### TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written [LaSi-10Zho.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-10Zho.tdb): LIQUID, type code %, sha256 `40aef7ee33d576b9…` ~~~~text 21: PHASE LIQUID:L % 1 1 ! 22: CONST LIQUID:L : LA SI : ! ~~~~ [LaSi-20Xu.tdb](https://orchid-project.org/data/databases/sgte-binary/LaSi-20Xu.tdb): LIQUID, type code %, sha256 `63d465a532cafc3b…` ~~~~text 20: PHASE LIQUID:L % 1 1 ! 21: CONST LIQUID:L : LA SI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1016/j.jallcom.2009.09.171](https://doi.org/10.1016/j.jallcom.2009.09.171) Shaoxin Zhou, Libin Liu, Xiaoli Yuan, Feng Zheng, Zhanpeng Jin, Thermodynamic assessment of La–Si and Mg–La–Si systems, Journal of Alloys and Compounds 490, 253-259 (2010). _assessment that models this phase; reports values for this phase_ - [doi:10.1111/jace.17031](https://doi.org/10.1111/jace.17031) Kai Xu, Keke Chang, Xiaobing Zhou, Leilei Chen, Junwen Liu, Zixuan Deng et al., Thermodynamic descriptions of the light rare‐earth elements in silicon carbide ceramics, J Am Ceram Soc 103, 3812-3825 (2020). _assessment that models this phase_ - [doi:10.1016/s0925-8388(01)01686-3](https://doi.org/10.1016/s0925-8388%2801%2901686-3) M.V. Bulanova, P.N. Zheltov, K.A. Meleshevich, P.A. Saltykov, G. Effenberg, J.-C. Tedenac, Lanthanum–silicon system, Journal of Alloys and Compounds 329, 214-223 (2001). _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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).