Disilicon carbide
- Formula: CSi2
- Molecular weight: 68.1817
- CAS Registry Number: 12070-04-1
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Gas phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | 535.55 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 242.29 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1966 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1200. | 1200. to 6000. |
|---|---|---|
| A | 38.96220 | 62.75874 |
| B | 41.84126 | -7.005439 |
| C | -29.86230 | 4.097706 |
| D | 7.853285 | -0.425546 |
| E | -0.139347 | 0.696590 |
| F | 521.8578 | 513.9207 |
| G | 277.4360 | 312.3410 |
| H | 535.5520 | 535.5520 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1966 | Data last reviewed in March, 1966 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Vibrational and/or electronic energy levels, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 9.0 ± 0.5 | EI | Stearns and Kohl, 1973 | LLK |
| 9.5 ± 0.5 | EI | Guido and Gigli, 1973 | LLK |
| 9.1 | EI | Verhaegen, Stafford, et al., 1964 | RDSH |
| 9.2 ± 0.3 | EI | Drowart, DeMaria, et al., 1958 | RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| Si2+ | ~15. | C | EI | Auwera-Mahieu, Peeters, et al., 1970 | RDSH |
Vibrational and/or electronic energy levels
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Marilyn E. Jacox
State: X
| Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
|---|---|---|---|---|---|---|---|
| a1 | 1 | Sym. stretch | 839.5 | Ar | IR | Presilla-Marquez and Graham, 1991 | |
| 2 | Bend | 166.4 | T | Ar | IR | Presilla-Marquez and Graham, 1991 | |
| b2 | 3 | Asym. stretch | 1188.4 | s | Ar | IR | Kafafi, Hauge, et al., 1983 Presilla-Marquez and Graham, 1991 |
Additional references: Jacox, 1994, page 67
Notes
| s | Strong |
| T | Tentative assignment or approximate value |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Stearns and Kohl, 1973
Stearns, C.A.; Kohl, F.J.,
Mass spectrometric determination of the dissociation energies of gaseous Al2, AlSi, and AlSiO,
High Temp. Sci., 1973, 5, 113. [all data]
Guido and Gigli, 1973
Guido, M.; Gigli, G.,
Mass spectrometric study of the CeSiC molecules,
J. Chem. Phys., 1973, 59, 3437. [all data]
Verhaegen, Stafford, et al., 1964
Verhaegen, G.; Stafford, F.E.; Drowart, J.,
Mass spectrometric study of the systems boron-carbon and boron-carbon-silicon,
J. Chem. Phys., 1964, 40, 1622. [all data]
Drowart, DeMaria, et al., 1958
Drowart, J.; DeMaria, G.; Inghram, M.G.,
Thermodynamic study of SiC utilizing a mass spectrometer,
J. Chem. Phys., 1958, 29, 1015. [all data]
Auwera-Mahieu, Peeters, et al., 1970
Auwera-Mahieu, A.V.; Peeters, R.; McIntyre, N.S.; Drowart, J.,
Mass spectrometric determination of dissociation energies of the borides and suicides of some transition metals,
J. Chem. Soc. Faraday Trans., 1970, 66, 809. [all data]
Presilla-Marquez and Graham, 1991
Presilla-Marquez, J.D.; Graham, W.R.M.,
Fourier transform vibrational spectroscopy of Si2C in solid Ar,
J. Chem. Phys., 1991, 95, 8, 5612, https://doi.org/10.1063/1.461636
. [all data]
Kafafi, Hauge, et al., 1983
Kafafi, Z.H.; Hauge, R.H.; Fredin, L.; Margrave, J.L.,
Infrared matrix isolation spectrum of the disilicon carbide (Si2C) molecule,
J. Phys. Chem., 1983, 87, 5, 797, https://doi.org/10.1021/j100228a020
. [all data]
Jacox, 1994
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References
- Symbols used in this document:
AE Appearance energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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