Selected ATcT [1, 2] enthalpy of formation based on version 1.202 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.176 in order to include species related to the thermochemistry of glycine[4].

Silicon carbide

Formula: SiC (g)

CAS RN: 409-21-2

ATcT ID: 409-21-2*0

SMILES: [Si]=[C]

InChI: InChI=1S/CSi/c1-2

InChIKey: HBMJWWWQQXIZIP-UHFFFAOYSA-N

Hills Formula: C1Si1

2D Image:

Aliases: SiC; Silicon carbide; Silanyliumylidynemethanide

Relative Molecular Mass: 40.09620 ± 0.00085

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
739.3	744.3	± 2.3	kJ/mol

3D Image of SiC (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of SiC (g)

The 12 contributors listed below account for 90.9% of the provenance of Δ_fH° of SiC (g).

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
11.5	8701.4	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 99.75 ± 1.50 kcal/mol	Ruscic W1RO
10.3	8704.4	[SiC]+ (g) → Si (g) + C (g)	Δ_rH°(0 K) = -106.37 ± 1.50 kcal/mol	Ruscic W1RO
10.1	8701.2	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 100.97 ± 1.60 kcal/mol	Ruscic G4
9.9	8701.7	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 4.32 ± 0.07 eV	Borin 2005, est unc
9.1	8704.2	[SiC]+ (g) → Si (g) + C (g)	Δ_rH°(0 K) = -104.82 ± 1.60 kcal/mol	Ruscic G4
8.7	8701.1	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 101.87 ± 1.72 kcal/mol	Ruscic G3X
7.6	8701.6	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 4.30 ± 0.08 eV	Martin 1990b
5.5	8701.3	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 100.69 ± 2.16 kcal/mol	Ruscic CBS-n
5.0	8704.3	[SiC]+ (g) → Si (g) + C (g)	Δ_rH°(0 K) = -105.91 ± 2.16 kcal/mol	Ruscic CBS-n
4.5	8701.5	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 426.5 ± 10 kJ/mol	Deng 2008, est unc
4.3	8704.1	[SiC]+ (g) → Si (g) + C (g)	Δ_rH°(0 K) = -103.60 ± 1.72 (×1.354) kcal/mol	Ruscic G3X
3.8	8715.1	SiC (cr, alpha-hex) → SiC (g)	Δ_rG°(2248 K) = 84.12 ± 2.6 kcal/mol	Drowart 1958, 3rd Law

Top 10 species with enthalpies of formation correlated to the Δ_fH° of SiC (g)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
92.8	Silicon carbide cation	[SiC]+ (g)	1604.8	1609.4	± 2.4	kJ/mol	40.09565 ± 0.00085	78393-58-5*0
52.6	Silicon carbide anion	[SiC]- (g)	508.8	513.4	± 4.3	kJ/mol	40.09675 ± 0.00085	86017-99-4*0
24.0	Silicon atom dication	[Si]+2 (g)	2814.00	2816.98	± 0.56	kJ/mol	28.08440 ± 0.00030	14175-55-4*0
24.0	Silicon cation	Si+ (g)	1236.86	1240.99	± 0.56	kJ/mol	28.08495 ± 0.00030	14067-07-3*0
24.0	Silicon anion	Si- (g)	316.28	319.26	± 0.56	kJ/mol	28.08605 ± 0.00030	14337-02-1*0
24.0	Silicon	Si (g)	450.34	454.68	± 0.56	kJ/mol	28.08550 ± 0.00030	7440-21-3*0
24.0	Silicon atom trication	[Si]+3 (g)	6045.58	6048.56	± 0.56	kJ/mol	28.08385 ± 0.00030	14175-56-5*0
24.0	Silicon atom tetracation	[Si]+4 (g)	10401.10	10404.08	± 0.56	kJ/mol	28.08331 ± 0.00030	22537-24-2*0
20.6	Disilane	SiH3SiH3 (g)	92.0	75.9	± 1.3	kJ/mol	62.21864 ± 0.00073	1590-87-0*0
20.5	Silane	SiH4 (g)	42.66	33.04	± 0.63	kJ/mol	32.11726 ± 0.00041	7803-62-5*0

Most Influential reactions involving SiC (g)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
0.815	8702.1	SiC (g) → [SiC]+ (g)	Δ_rH°(0 K) = 8.978 ± 0.010 eV	Gans 2023
0.575	8703.4	[SiC]- (g) → SiC (g)	Δ_rH°(0 K) = 2.388 ± 0.050 eV	Ruscic W1RO
0.373	8716.4	SiC (g) + [Si2]+ (g) → [SiC]+ (g) + Si2 (g)	Δ_rH°(0 K) = 1.033 ± 0.030 eV	Ruscic W1RO
0.170	8703.3	[SiC]- (g) → SiC (g)	Δ_rH°(0 K) = 2.428 ± 0.092 eV	Ruscic CBS-n
0.143	8703.5	[SiC]- (g) → SiC (g)	Δ_rH°(0 K) = 2.42 ± 0.10 eV	Inostroza 2010, est unc
0.139	8716.2	SiC (g) + [Si2]+ (g) → [SiC]+ (g) + Si2 (g)	Δ_rH°(0 K) = 1.001 ± 0.049 eV	Ruscic G4
0.122	8701.4	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 99.75 ± 1.50 kcal/mol	Ruscic W1RO
0.108	8701.2	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 100.97 ± 1.60 kcal/mol	Ruscic G4
0.106	8701.7	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 4.32 ± 0.07 eV	Borin 2005, est unc
0.093	8701.1	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 101.87 ± 1.72 kcal/mol	Ruscic G3X
0.087	8716.1	SiC (g) + [Si2]+ (g) → [SiC]+ (g) + Si2 (g)	Δ_rH°(0 K) = 1.015 ± 0.062 eV	Ruscic G3X
0.081	8701.6	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 4.30 ± 0.08 eV	Martin 1990b
0.063	8703.6	[SiC]- (g) → SiC (g)	Δ_rH°(0 K) = 2.28 ± 0.15 eV	Pramanik 2009, est unc
0.059	8701.3	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 100.69 ± 2.16 kcal/mol	Ruscic CBS-n
0.056	8715.1	SiC (cr, alpha-hex) → SiC (g)	Δ_rG°(2248 K) = 84.12 ± 2.6 kcal/mol	Drowart 1958, 3rd Law
0.051	8702.5	SiC (g) → [SiC]+ (g)	Δ_rH°(0 K) = 8.938 ± 0.040 eV	Ruscic W1RO
0.048	8701.5	SiC (g) → Si (g) + C (g)	Δ_rH°(0 K) = 426.5 ± 10 kJ/mol	Deng 2008, est unc
0.035	8716.3	SiC (g) + [Si2]+ (g) → [SiC]+ (g) + Si2 (g)	Δ_rH°(0 K) = 1.140 ± 0.066 (×1.477) eV	Ruscic CBS-n
0.033	8716.5	SiC (g) + [Si2]+ (g) → [SiC]+ (g) + Si2 (g)	Δ_rH°(0 K) = 1.03 ± 0.10 eV	Bruna 1981, est unc
0.018	8703.7	[SiC]- (g) → SiC (g)	Δ_rH°(0 K) = 2.67 ± 0.15 (×1.874) eV	Cai 1999, est unc

References

1		B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2		B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, Active Thermochemical Tables: Thermochemistry for the 21^st Century. J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3		B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.202 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		B. Ruscic and D. H. Bross Accurate and Reliable Thermochemistry by Data Analysis of Complex Thermochemical Networks using Active Thermochemical Tables: The Case of Glycine Thermochemistry Faraday Discuss. (in press) (2024) [DOI: 10.1039/D4FD00110A]
5		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.

Acknowledgement

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.