niobium oxide


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
Δfgas47.500kcal/molReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
gas,1 bar57.091cal/mol*KReviewChase, 1998Data last reviewed in December, 1973

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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 3000. to 6000.
A 8.540225
B 0.191408
C 0.005594
D 0.004413
E -0.122152
F 44.52940
G 66.68212
H 47.50000
ReferenceChase, 1998
Comment Data last reviewed in December, 1973

Condensed 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
Δfliquid-80.483kcal/molReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
liquid,1 bar19.89cal/mol*KReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
Δfsolid-100.30kcal/molReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
solid11.00cal/mol*KReviewChase, 1998Data last reviewed in December, 1973

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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 2210. to 3000.
A 14.99952
B 0.000373
C -0.000108
D 0.000011
E 0.000321
F -88.60086
G 32.44073
H -80.48351
ReferenceChase, 1998
Comment Data last reviewed in December, 1973

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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. to 2210.
A 10.27806
B 2.114613
C 0.004440
D -0.001371
E -0.096227
F -103.7813
G 22.26568
H -100.3000
ReferenceChase, 1998
Comment Data last reviewed in December, 1973

Gas phase ion energetics 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 as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard

Ionization energy determinations

IE (eV) Method Reference Comment
7.91 ± 0.02PEDyke, Ellis, et al., 1987LBLHLM
7.0 ± 0.5EIBalducci, Gigli, et al., 1987LBLHLM

References

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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]

Dyke, Ellis, et al., 1987
Dyke, J.M.; Ellis, A.M.; Feher, M.; Morris, A.; Paul, A.J.; Stevens, J.C.H., High-temperature photoelectron spectroscopy - A study of niobium monoxide and tantalum monoxide, J. Chem. Soc. Faraday Trans. 2, 1987, 83, 1555. [all data]

Balducci, Gigli, et al., 1987
Balducci, G.; Gigli, G.; Guido, M., Thermochemical study of the gaseous molecules EuNbO3, EuNbO2, EuNb2O6 and of the niobium oxides NbO and NbO2, Ber. Bunsen-Ges. Phys. Chem., 1987, 91, 635. [all data]


Notes

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