Co–Si system

74 accepted literature values from 2 paper(s) (experimental 49, model 13, unspecified 12); 2 calculated phase diagram(s). 21 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence classValues
experimental49
model13
unspecified12
Accepted values by property group
Property groupValues
invariant reaction54
phase transition14
formation5
other property1

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB fileAssessmentSHA-256Links
CoSi-06Zha.tdbL. Zhang, Y. Du, H. Xu, Z. Pan, Calphad, 30, 470-81(2006). doi:10.1016/j.calphad.2006.06.001849716b03f938610d110fb62984db7ff0726ff00bd2e68a5a0e5c47433af5179viewer · TDB · JSON
CoSi-92Cho-LB.tdbS.-D. Choi, Calphad, 16, 151-59(1992). doi:10.1016/0364-5916(92)90003-G9fb5aa520ab17aa5cab74dd30e406ecbd7d0ba3318df847e7d1ccdee473950c2viewer · TDB · JSON
Calculated three-phase invariants (model, mole fraction of the second component)
TDB fileT (K)Phases at the invariant
CoSi-06Zha.tdb1594.25LIQUID (x(Si) 0.31643) + CO2SI_C37 (x(Si) 0.33297) + CO2SI_BETA (x(Si) 0.33337)
CoSi-06Zha.tdb1585.96COSI_B20 (x(Si) 0.51489) + LIQUID (x(Si) 0.63509) + COSI2_C1 (x(Si) 0.66667)
CoSi-06Zha.tdb1585.96COSI_B20 (x(Si) 0.51491) + LIQUID (x(Si) 0.63517) + COSI2_C1 (x(Si) 0.66667)
CoSi-06Zha.tdb1576.88CO2SI_BETA (x(Si) 0.34652) + LIQUID (x(Si) 0.37804) + COSI_B20 (x(Si) 0.49115)
CoSi-06Zha.tdb1532.45COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.77847) + DIAMOND_A4 (x(Si) 1)
CoSi-06Zha.tdb1532.45COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.77863) + DIAMOND_A4 (x(Si) 1)
CoSi-06Zha.tdb1512.3CO2SI_C37 (x(Si) 0.33776) + CO2SI_BETA (x(Si) 0.34317) + COSI_B20 (x(Si) 0.4914)
CoSi-06Zha.tdb1509.61FCC_A1 (x(Si) 0.13082) + HCP_A3 (x(Si) 0.15924) + LIQUID (x(Si) 0.20946)
CoSi-06Zha.tdb1487.93LIQUID (x(Si) 0.24267) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.32401)
CoSi-06Zha.tdb1475.55HCP_A3 (x(Si) 0.18563) + LIQUID (x(Si) 0.23231) + CO3SI_D019 (x(Si) 0.25)
CoSi-06Zha.tdb1467.38HCP_A3 (x(Si) 0.18891) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.32229)
CoSi-92Cho-LB.tdb1963.38LIQUID (x(Si) 0.51481) + HCP_A3 (x(Si) 0.55527) + FCC_A1 (x(Si) 0.55791)
CoSi-92Cho-LB.tdb1758.89HCP_A3 (x(Si) 0.69033) + FCC_A1 (x(Si) 0.69201) + LIQUID (x(Si) 0.72173)
CoSi-92Cho-LB.tdb1588.89COSI_B20 (x(Si) 0.5) + LIQUID (x(Si) 0.63052) + COSI2_C1 (x(Si) 0.66667)
CoSi-92Cho-LB.tdb1588.89COSI_B20 (x(Si) 0.5) + LIQUID (x(Si) 0.63023) + COSI2_C1 (x(Si) 0.66667)
CoSi-92Cho-LB.tdb1588.89COSI_B20 (x(Si) 0.5) + LIQUID (x(Si) 0.63063) + COSI2_C1 (x(Si) 0.66667)
CoSi-92Cho-LB.tdb1564.79CO2SI_C37 (x(Si) 0.33333) + LIQUID (x(Si) 0.3815) + COSI_B20 (x(Si) 0.5)
CoSi-92Cho-LB.tdb1564.79CO2SI_C37 (x(Si) 0.33333) + LIQUID (x(Si) 0.38166) + COSI_B20 (x(Si) 0.5)
CoSi-92Cho-LB.tdb1530.79COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.78879) + DIAMOND_A4 (x(Si) 1)
CoSi-92Cho-LB.tdb1530.79COSI2_C1 (x(Si) 0.66667) + LIQUID (x(Si) 0.78904) + DIAMOND_A4 (x(Si) 1)
CoSi-92Cho-LB.tdb1526.23FCC_A1 (x(Si) 0.16288) + HCP_A3 (x(Si) 0.16901) + LIQUID (x(Si) 0.2213)
CoSi-92Cho-LB.tdb1482.7LIQUID (x(Si) 0.24778) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333)
CoSi-92Cho-LB.tdb1482.7LIQUID (x(Si) 0.2479) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333)
CoSi-92Cho-LB.tdb1482.22HCP_A3 (x(Si) 0.19075) + LIQUID (x(Si) 0.24535) + CO3SI_D019 (x(Si) 0.25)
CoSi-92Cho-LB.tdb1482.22HCP_A3 (x(Si) 0.19073) + LIQUID (x(Si) 0.24533) + CO3SI_D019 (x(Si) 0.25)
CoSi-92Cho-LB.tdb1474.88HCP_A3 (x(Si) 0.19101) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333)
CoSi-92Cho-LB.tdb1474.88HCP_A3 (x(Si) 0.19102) + CO3SI_D019 (x(Si) 0.25) + CO2SI_C37 (x(Si) 0.33333)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CoSi-92Cho-LB

Invariant reactions (literature)

Invariant reactions reported in the literature for the Co–Si system (54)
T (K)Reaction / phasesCompositions (mole fraction)ClassSourceLocationQuote
1738congruent melting: L -> CoSiL: Si 0.5; CoSi: Si 0.5experimental[1] Zhang 2006
cites Kalishevich 1964
Table 5, p. 9, row 35
report
1733congruent melting: L -> CoSiL: Si 0.5; CoSi: Si 0.5experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 34
report
1730congruent melting: L -> CoSiL: Si 0.5; CoSi: Si 0.5unspecified[1] Zhang 2006Table 5, p. 9, row 36
report
1605.15congruent melting: L -> βCo2SiL: Si 0.333; βCo2Si: Si 0.333experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 32
report
1605.15congruent melting: L -> βCo2SiL: Si 0.333; βCo2Si: Si 0.333experimental[1] Zhang 2006
cites Vogel 1934 doi
Table 5, p. 9, row 31
report
1600congruent melting: L -> βCo2SiL: Si 0.333; βCo2Si: Si 0.333unspecified[1] Zhang 2006Table 5, p. 9, row 33
report
1599congruent melting: L -> CoSi2L: Si 0.667; CoSi2: Si 0.667experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 37
report
1595congruent melting: L -> CoSi2L: Si 0.667; CoSi2: Si 0.667experimental[1] Zhang 2006
cites Kalishevich 1968
Table 5, p. 9, row 38
report
1593peritectic: L + βCo2Si -> αCo2SiL: Si 0.31; βCo2Si: Si 0.326; αCo2Si: Si 0.33experimental[1] Zhang 2006
cites Ishida 1991 doi
Table 5, p. 9, row 15
report
1593congruent melting: L -> CoSi2L: Si 0.667; CoSi2: Si 0.667unspecified[1] Zhang 2006Table 5, p. 9, row 40
report
1592peritectic: L + βCo2Si -> αCo2SiL: Si 0.312; βCo2Si: Si 0.333; αCo2Si: Si 0.333unspecified[1] Zhang 2006Table 5, p. 9, row 16
report
1591congruent melting: L -> CoSi2L: Si 0.667; CoSi2: Si 0.667experimental[1] Zhang 2006Table 5, p. 9, row 39
report
1588.95L=CoSi+CoSi2L: Si 0.631; CoSi: Si 0.5; CoSi2: Si 0.667model[2] Soon-Don 1992Table 3, p. 7, row 4
report
1587eutectic: L -> CoSi + CoSi2L: Si 0.635; CoSi: Si 0.515; CoSi2: Si 0.667unspecified[1] Zhang 2006Table 5, p. 9, row 27
report
1584eutectic: L -> CoSi + CoSi2CoSi: Co 0.5, Si 0.5; CoSi2: Co 0.333333, Si 0.666667experimental[1] Zhang 2006Table 5, p. 9, row 26
report
1583.15L=CoSi+CoSi2L: Si 0.618; CoSi: Si 0.5; CoSi2: Si 0.667experimental[2] Soon-Don 1992Table 3, p. 7, row 3
report
1583.15eutectic: L -> CoSi + CoSi2L: Si 0.618; CoSi: Si 0.521; CoSi2: Si 0.667experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 25
report
1577eutectic: L -> βCo2Si + CoSiL: Si 0.378; βCo2Si: Si 0.346; CoSi: Si 0.491unspecified[1] Zhang 2006Table 5, p. 9, row 20
report
1572eutectic: L -> βCo2Si + CoSiβCo2Si: Co 0.666667, Si 0.333333; CoSi: Co 0.5, Si 0.5experimental[1] Zhang 2006Table 5, p. 9, row 19
report
1564.95L=Co2Si+CoSiL: Si 0.382; Co2Si: Si 0.333; CoSi: Si 0.5model[2] Soon-Don 1992Table 3, p. 7, row 6
report
1559.15eutectic: L -> βCo2Si + CoSiL: Si 0.397; βCo2Si: Si 0.358; CoSi: Si 0.491experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 18
report
1559.15L=Co2Si+CoSiL: Si 0.397; Co2Si: Si 0.333; CoSi: Si 0.5experimental[2] Soon-Don 1992Table 3, p. 7, row 5
report
1543.15eutectic: L -> βCo2Si + CoSiL: Si 0.396; βCo2Si: Si 0.36; CoSi: Si 0.5experimental[1] Zhang 2006
cites Vogel 1934 doi
Table 5, p. 9, row 17
report
1533eutectic: L -> CoSi2 + (Si)L: Si 0.779; CoSi2: Si 0.667; (Si): Si 1unspecified[1] Zhang 2006Table 5, p. 9, row 30
report
1533eutectic: L -> CoSi2 + (Si)CoSi2: Co 0.333333, Si 0.666667experimental[1] Zhang 2006Table 5, p. 9, row 29
report
1532.15eutectic: L -> CoSi2 + (Si)L: Si 0.775; CoSi2: Si 0.667; (Si): Si 0.979experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 28
report
1532.15L=CoSi2+SiL: Si 0.775; CoSi2: Si 0.667; Si: Si 1experimental[2] Soon-Don 1992Table 3, p. 7, row 1
report
1530.85L=CoSi2+SiL: Si 0.789; CoSi2: Si 0.667; Si: Si 1model[2] Soon-Don 1992Table 3, p. 7, row 2
report
1523.15peritectic: L + (αCo) -> (εCo)L: Si 0.214; (αCo): Si 0.165; (εCo): Si 0.175experimental[1] Zhang 2006
cites Koster 1973
Table 5, p. 9, row 1
report
1523.15α-Co+L=ε-Coα-Co: Si 0.165; L: Si 0.214; ε-Co: Si 0.175experimental[2] Soon-Don 1992Table 3, p. 7, row 13
report
1520.55α-Co+L=ε-Coα-Co: Si 0.162; L: Si 0.22; ε-Co: Si 0.168model[2] Soon-Don 1992Table 3, p. 7, row 14
report
1517eutectoid: βCo2Si -> αCo2Si + CoSiβCo2Si: Co 0.666667, Si 0.333333; αCo2Si: Co 0.666667, Si 0.333333; CoSi: Co 0.5, Si 0.5experimental[1] Zhang 2006Table 5, p. 9, row 23
report
1514peritectic: L + (αCo) -> (εCo)experimental[1] Zhang 2006Table 5, p. 9, row 2
report
1511.15eutectoid: βCo2Si -> αCo2Si + CoSiβCo2Si: Si 0.351; αCo2Si: Si 0.341; CoSi: Si 0.491experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 22
report
1511eutectoid: βCo2Si -> αCo2Si + CoSiβCo2Si: Si 0.343; αCo2Si: Si 0.338; CoSi: Si 0.491unspecified[1] Zhang 2006Table 5, p. 9, row 24
report
1510peritectic: L + (αCo) -> (εCo)L: Si 0.209; (αCo): Si 0.131; (εCo): Si 0.159unspecified[1] Zhang 2006Table 5, p. 9, row 3
report
1488peritectic: L + αCo2Si -> αCo3SiL: Si 0.243; αCo2Si: Si 0.324; αCo3Si: Si 0.25unspecified[1] Zhang 2006Table 5, p. 9, row 14
report
1487.15L+Co2Si=Co3SiL: Si 0.244; Co2Si: Si 0.333; Co3Si: Si 0.25experimental[2] Soon-Don 1992Table 3, p. 7, row 7
report
1487peritectic: L + αCo2Si -> αCo3SiL: Si 0.244; αCo2Si: Co 0.666667, Si 0.333333; αCo3Si: Si 0.25experimental[1] Zhang 2006
cites Koster 1973
Table 5, p. 9, row 13
report
1485.15peritectic: L + αCo2Si -> αCo3SiL: Si 0.239; αCo2Si: Si 0.323; αCo3Si: Si 0.25experimental[1] Zhang 2006
cites Haschimoto 1937 doi
Table 5, p. 9, row 11
report
1483.15peritectic: L + αCo2Si -> αCo3SiL: Si 0.248; αCo2Si: Si 0.333; αCo3Si: Si 0.25experimental[1] Zhang 2006
cites Vogel 1934 doi
Table 5, p. 9, row 10
report
1483.15peritectic: L + αCo2Si -> αCo3SiαCo2Si: Si 0.333; αCo3Si: Si 0.25experimental[1] Zhang 2006
cites Boomgaard 1972 doi
Table 5, p. 9, row 12
report
1483.15L+Co2Si=Co3SiL: Si 0.248; Co2Si: Si 0.333; Co3Si: Si 0.25model[2] Soon-Don 1992Table 3, p. 7, row 8
report
1481.35L=ε-Co+Co3SiL: Si 0.242; ε-Co: Si 0.188; Co3Si: Si 0.25model[2] Soon-Don 1992Table 3, p. 7, row 10
report
1481.15eutectoid: βCo2Si -> αCo2Si + CoSiβCo2Si: Si 0.357; αCo2Si: Si 0.34; CoSi: Si 0.5experimental[1] Zhang 2006
cites Vogel 1934 doi
Table 5, p. 9, row 21
report
1478eutectic: L -> αCo3Si + (εCo)αCo3Si: Co 0.75, Si 0.25experimental[1] Zhang 2006Table 5, p. 9, row 5
report
1477.15eutectic: L -> αCo3Si + (εCo)L: Si 0.231; αCo3Si: Si 0.25; (εCo): Si 0.184experimental[1] Zhang 2006
cites Koster 1973
Table 5, p. 9, row 4
report
1477.15L=ε-Co+Co3SiL: Si 0.231; ε-Co: Si 0.184; Co3Si: Si 0.25experimental[2] Soon-Don 1992Table 3, p. 7, row 9
report
1475eutectic: L -> αCo3Si + (εCo)L: Si 0.232; αCo3Si: Si 0.25; (εCo): Si 0.186unspecified[1] Zhang 2006Table 5, p. 9, row 6
report
1467eutectic: αCo3Si -> (εCo) + αCo2SiαCo3Si: Si 0.25; (εCo): Si 0.189; αCo2Si: Si 0.322unspecified[1] Zhang 2006Table 5, p. 9, row 9
report
1466.15eutectic: αCo3Si -> (εCo) + αCo2SiαCo3Si: Si 0.25; (εCo): Si 0.181; αCo2Si: Co 0.666667, Si 0.333333experimental[1] Zhang 2006
cites Koster 1973
Table 5, p. 9, row 7
report
1466.15Co3Si=ε-Co+Co2SiCo3Si: Si 0.25; ε-Co: Si 0.181; Co2Si: Si 0.333experimental[2] Soon-Don 1992Table 3, p. 7, row 11
report
1464eutectic: αCo3Si -> (εCo) + αCo2SiαCo3Si: Co 0.75, Si 0.25; αCo2Si: Co 0.666667, Si 0.333333experimental[1] Zhang 2006Table 5, p. 9, row 8
report
1463.05Co3Si=ε-Co+Co2SiCo3Si: Si 0.25; ε-Co: Si 0.188; Co2Si: Si 0.333model[2] Soon-Don 1992Table 3, p. 7, row 12
report

Other properties

Phase transition (14)

Phase transition, Co–Si system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Phase transition1373.15 K1373.151
alloy: Co 0.88, Si 0.12
experimental[1] Zhang 2006Table 2, p. 4, row 1
report
Phase transition1373.15 K1373.152
alloy: Co 0.8, Si 0.2
experimental[1] Zhang 2006Table 2, p. 4, row 2
report
Phase transition1373.15 K1373.153
alloy: Co 0.704, Si 0.296
experimental[1] Zhang 2006Table 2, p. 4, row 3
report
Phase transition1373.15 K1373.154
alloy: Co 0.6, Si 0.4
experimental[1] Zhang 2006Table 2, p. 4, row 4
report
Phase transition1373.15 K1373.155
alloy: Co 0.4, Si 0.6
experimental[1] Zhang 2006Table 2, p. 4, row 5
report
Phase transition1373.15 K1373.156
alloy: Co 0.3333, Si 0.6667
experimental[1] Zhang 2006Table 2, p. 4, row 6
report
Phase transition1373.15 K1373.157
alloy: Co 0.28, Si 0.72
experimental[1] Zhang 2006Table 2, p. 4, row 7
report
Phase transition1373.15 K1373.158
alloy: Co 0.14, Si 0.86
experimental[1] Zhang 2006Table 2, p. 4, row 8
report
Phase transition1597.15 K1597.15L=CoSi2.
CoSi2: Si 0.667
model[2] Soon-Don 1992Table 3, p. 7, row 16
report
Phase transition1599.15 K1599.15L=CoSi2.
CoSi2: Si 0.667
experimental[2] Soon-Don 1992Table 3, p. 7, row 15
report
Phase transition1603.85 K1603.85L=Co2Si
Co2Si: Si 0.333
model[2] Soon-Don 1992Table 3, p. 7, row 20
report
Phase transition1607.15 K1607.15L=Co2Si
Co2Si: Si 0.333
experimental[2] Soon-Don 1992Table 3, p. 7, row 19
report
Phase transition1728.25 K1728.25L=CoSi
CoSi: Si 0.5
model[2] Soon-Don 1992Table 3, p. 7, row 18
report
Phase transition1733.15 K1733.15L=CoSi
CoSi: Si 0.5
experimental[2] Soon-Don 1992Table 3, p. 7, row 17
report

Formation (5)

Formation, Co–Si system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Entropy of formation
printed: ΔSf(298K)
-0.32 unknown298.15Co2Si
alloy: Si 0.333333
model[2] Soon-Don 1992Table 4, p. 8, row 2
report
Entropy of formation
printed: ΔSf(298K)
-1.2 unknown298.15Co2Si
alloy: Si 0.333333
experimental[2] Soon-Don 1992Table 4, p. 8, row 1
report
Entropy of formation
printed: ΔSf(298K)
-2.4 unknown298.15CoSi
alloy: Si 0.5
model[2] Soon-Don 1992Table 4, p. 8, row 4
report
Entropy of formation
printed: ΔSf(298K)
-3.1 unknown298.15CoSi
alloy: Si 0.5
experimental[2] Soon-Don 1992Table 4, p. 8, row 3
report
Entropy of formation
printed: ΔSf(298K)
0.63 unknown298.15CoSi2
alloy: Si 0.666667
model[2] Soon-Don 1992Table 4, p. 8, row 6
report

Other property (1)

Other property, Co–Si system
PropertyValueT (K)Phases / compositionClassSourceLocationQuote
Other
printed: βCo
1.35 μB1396experimental[1] Zhang 2006
cites Fernandez 1987
p. 8
report
According to Guillermet [48], TCo 0 (1396 K) and βCo (1.35 μB) of (εCo) phase are equal to those Co,Si of (αCo) phase.

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

  1. Lijun Zhang, Yong Du, Honghui Xu, Zhu Pan, Experimental investigation and thermodynamic description of the Co–Si system, Calphad 30, 470-481 (2006). doi:10.1016/j.calphad.2006.06.001
  2. Choi Soon-Don, Thermodynamic analysis of the Co-Si system, Calphad 16, 151-159 (1992). doi:10.1016/0364-5916(92)90003-g