niobium
- Formula: Nb
- Molecular weight: 92.90638
- IUPAC Standard InChI: InChI=1S/Nb
- IUPAC Standard InChIKey: GUCVJGMIXFAOAE-UHFFFAOYSA-N
- CAS Registry Number: 7440-03-1
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
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Gas Phase Heat Capacity (Shomate Equation)
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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. to 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 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1973 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 5131. | 8.83 | 63.56 | 57.01 | 33.63 |
| 5200. | 8.81 | 63.68 | 57.10 | 34.24 |
| 5300. | 8.81 | 63.85 | 57.22 | 35.12 |
| 5400. | 8.86 | 64.01 | 57.35 | 36.00 |
| 5500. | 8.92 | 64.18 | 57.47 | 36.89 |
| 5600. | 8.99 | 64.34 | 57.59 | 37.78 |
| 5700. | 9.06 | 64.50 | 57.71 | 38.69 |
| 5800. | 9.13 | 64.66 | 57.83 | 39.60 |
| 5900. | 9.19 | 64.81 | 57.95 | 40.51 |
| 6000. | 9.27 | 64.97 | 58.06 | 41.44 |
References
Go To: Top, Gas Phase Heat Capacity (Shomate Equation), 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]
Notes
Go To: Top, Gas Phase Heat Capacity (Shomate Equation), References
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