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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, References, Notes

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
Deltafgas450. ± 8.kJ/molReviewCox, Wagman, et al., 1984CODATA Review value
Deltafgas450.00kJ/molReviewChase, 1998Data last reviewed in March, 1967
Quantity Value Units Method Reference Comment
gas,1 bar167.981 ± 0.004J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar167.98J/mol*KReviewChase, 1998Data last reviewed in March, 1967

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) 3504.616 - 6000.
A 14.59321
B 5.224644
C -1.078879
D 0.074000
E 2.309405
F 450.3365
G 190.2494
H 450.0018
ReferenceChase, 1998
Comment Data last reviewed in March, 1967

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, References, Notes

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
Deltafliquid48.47kJ/molReviewChase, 1998Data last reviewed in March, 1967
Quantity Value Units Method Reference Comment
liquid,1 bar44.46J/mol*KReviewChase, 1998Data last reviewed in March, 1967
Quantity Value Units Method Reference Comment
solid,1 bar18.81 ± 0.08J/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
Quantity Value Units Method Reference Comment
solid18.82J/mol*KReviewChase, 1998Data last reviewed in March, 1967

Liquid 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) 1685. - 3504.616
A 27.19604
B -1.198306×10-10
C 5.353262×10-11
D -6.956612×10-12
E -4.294375×10-12
F 40.36163
G 77.37178
H 48.46997
ReferenceChase, 1998
Comment Data last reviewed in March, 1967

Solid 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. - 1685.
A 22.81719
B 3.899510
C -0.082885
D 0.042111
E -0.354063
F -8.163946
G 43.27846
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in March, 1967

Phase change 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.

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
1997. - 2560.9.5643623308.848-123.133Stull, 1947Coefficents calculated by NIST from author's data.

Reaction 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.

Data compiled by: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

(Si4- bullet 4294967295silicon) + silicon = Si4-

By formula: (Si4- bullet 4294967295Si) + Si = Si4-

Quantity Value Units Method Reference Comment
Deltar411. ± 29.kJ/molN/ANakajima, Taguwa, et al., 1995gas phase; Vertical Detachment Energy: 2.15±0.04 eV.

(CAS Reg. No. 11080-58-3 bullet 4294967295silicon) + silicon = CAS Reg. No. 11080-58-3

By formula: (CAS Reg. No. 11080-58-3 bullet 4294967295Si) + Si = CAS Reg. No. 11080-58-3

Quantity Value Units Method Reference Comment
Deltar305. ± 14.kJ/molN/AKawamata, Neigishi, et al., 1996gas phase; Vertical Detachment Energy: 0.81±0.05 eV.

(CAS Reg. No. 106389-62-2 bullet 4294967295silicon) + silicon = CAS Reg. No. 106389-62-2

By formula: (CAS Reg. No. 106389-62-2 bullet 4294967295Si) + Si = CAS Reg. No. 106389-62-2

Quantity Value Units Method Reference Comment
Deltar469. ± 34.kJ/molN/AXu, Taylor, et al., 1998gas phase

(Si3- bullet 4294967295silicon) + silicon = Si3-

By formula: (Si3- bullet 4294967295Si) + Si = Si3-

Quantity Value Units Method Reference Comment
Deltar19. ± 18.kJ/molN/AArnold and Neumark, 1994gas phase

(CAS Reg. No. 64236-73-3 bullet 4294967295silicon) + silicon = CAS Reg. No. 64236-73-3

By formula: (CAS Reg. No. 64236-73-3 bullet 4294967295Si) + Si = CAS Reg. No. 64236-73-3

Quantity Value Units Method Reference Comment
Deltar523. ± 17.kJ/molN/ANimlos, Harding, et al., 1987gas phase

(CAS Reg. No. 68865-96-3 bullet 4294967295silicon) + silicon = CAS Reg. No. 68865-96-3

By formula: (CAS Reg. No. 68865-96-3 bullet 4294967295Si) + Si = CAS Reg. No. 68865-96-3

Quantity Value Units Method Reference Comment
Deltar350. ± 13.kJ/molN/AKasdan, Herbst, et al., 1975gas phase

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [all data]

Nakajima, Taguwa, et al., 1995
Nakajima, A.; Taguwa, T.; Nakao, K.; Gomei, M.; Kishi, R.; Iwata, S.; Kaya, K., Photoelectron Spectroscopy of silicon-carbon cluster Anions (SinCm-), J. Chem. Phys., 1995, 103, 6, 2050, https://doi.org/10.1063/1.469731 . [all data]

Kawamata, Neigishi, et al., 1996
Kawamata, H.; Neigishi, Y.; Kishi, R.; Iwata, S.; Nakajima, A.; Kaya, K., Photoelectron Spectroscopy of Silicon-Fluorine Binary Cluster Anions (SinFm-), J. Chem. Phys., 1996, 105, 13, 5369, https://doi.org/10.1063/1.472377 . [all data]

Xu, Taylor, et al., 1998
Xu, C.S.; Taylor, T.R.; Burton, G.R.; Neumark, D.M., Vibrationally reserved photoelectron spectroscopy of silicon cluster anions Si-n(-) (n=3-7), J. Chem. Phys., 1998, 108, 4, 1395-1406, https://doi.org/10.1063/1.475511 . [all data]

Arnold and Neumark, 1994
Arnold, C.C.; Neumark, D.M., Threshold Photodetachment Zero-Electron Kinetic Energy Spectroscopy of Si-3(-), J. Chem. Phys., 1994, 100, 3, 1797, https://doi.org/10.1063/1.466532 . [all data]

Nimlos, Harding, et al., 1987
Nimlos, M.R.; Harding, L.B.; Ellison, G.B., The Electronic States of Si2 and Si2- as Revealed by Photoelectron Spectroscopy, J. Chem. Phys., 1987, 87, 9, 5116, https://doi.org/10.1063/1.453679 . [all data]

Kasdan, Herbst, et al., 1975
Kasdan, A.; Herbst, E.; Lineberger, W.C., Laser photoelectron spectrometry of the negative ions of silicon and its hydrides, J. Chem. Phys., 1975, 62, 541. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, References