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niobium


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
Deltafgas175.20kcal/molReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
gas,1 bar44.524cal/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) 5131. - 6000.
A -3498.327
B 1228.910
C -161.4106
D 7.539436
E 11390.30
F 10163.38
G 1480.418
H 175.2000
ReferenceChase, 1998
Comment Data last reviewed in December, 1973

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry 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
Deltafliquid7.087kcal/molReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
liquid,1 bar11.30cal/mol*KReviewChase, 1998Data last reviewed in December, 1973
Quantity Value Units Method Reference Comment
solid8.717cal/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) 2750. - 5130.824
A 8.000001
B 0.000001
C -1.163347×10-8
D -1.085402×10-8
E 0.000014
F 2.835995
G 18.34025
H 7.085732
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. - 2750.
A 5.261544
B 2.363327
C -1.350032
D 0.420576
E 0.005220
F -1.644573
G 14.46558
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in December, 1973

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

Niobium ion (1+) + niobium = (Niobium ion (1+) bullet niobium)

By formula: Nb+ + Nb = (Nb+ bullet Nb)

Quantity Value Units Method Reference Comment
Deltar136.kcal/molCIDLoh, Lian, et al., 1988gas phase; approximate value

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
136.0 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 9niobium) + niobium = (Niobium ion (1+) bullet 10niobium)

By formula: (Nb+ bullet 9Nb) + Nb = (Nb+ bullet 10Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
143.4 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 2niobium) + niobium = (Niobium ion (1+) bullet 3niobium)

By formula: (Nb+ bullet 2Nb) + Nb = (Nb+ bullet 3Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
141.0 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 3niobium) + niobium = (Niobium ion (1+) bullet 4niobium)

By formula: (Nb+ bullet 3Nb) + Nb = (Nb+ bullet 4Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
133.1 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 4niobium) + niobium = (Niobium ion (1+) bullet 5niobium)

By formula: (Nb+ bullet 4Nb) + Nb = (Nb+ bullet 5Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
135.8 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 5niobium) + niobium = (Niobium ion (1+) bullet 6niobium)

By formula: (Nb+ bullet 5Nb) + Nb = (Nb+ bullet 6Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
155.4 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 6niobium) + niobium = (Niobium ion (1+) bullet 7niobium)

By formula: (Nb+ bullet 6Nb) + Nb = (Nb+ bullet 7Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
141.5 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 7niobium) + niobium = (Niobium ion (1+) bullet 8niobium)

By formula: (Nb+ bullet 7Nb) + Nb = (Nb+ bullet 8Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
138.2 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet 8niobium) + niobium = (Niobium ion (1+) bullet 9niobium)

By formula: (Nb+ bullet 8Nb) + Nb = (Nb+ bullet 9Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
144.4 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Niobium ion (1+) bullet niobium) + niobium = (Niobium ion (1+) bullet 2niobium)

By formula: (Nb+ bullet Nb) + Nb = (Nb+ bullet 2Nb)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
117.1 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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.

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

Loh, Lian, et al., 1988
Loh, S.K.; Lian, L.; Hales, D.A.; Armentrout, P.B., Collision - Induced Dissociation Processes of Nb4+ and Fe4+: Fission vs Evaporation, J. Chem. Phys., 1988, 89, 1, 610, https://doi.org/10.1063/1.455455 . [all data]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]


Notes

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