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:
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- 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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Liquid 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) | 2750. to 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 |
| 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) |
|---|---|---|---|---|
| 2750. | 8.00 | 26.43 | 19.98 | 17.75 |
| 2800. | 8.00 | 26.58 | 20.09 | 18.15 |
| 2900. | 8.00 | 26.86 | 20.32 | 18.95 |
| 3000. | 8.00 | 27.13 | 20.55 | 19.75 |
| 3100. | 8.00 | 27.39 | 20.76 | 20.55 |
| 3200. | 8.00 | 27.65 | 20.97 | 21.35 |
| 3300. | 8.00 | 27.89 | 21.18 | 22.15 |
| 3400. | 8.00 | 28.13 | 21.38 | 22.95 |
| 3500. | 8.00 | 28.36 | 21.58 | 23.75 |
| 3600. | 8.00 | 28.59 | 21.77 | 24.55 |
| 3700. | 8.00 | 28.81 | 21.96 | 25.35 |
| 3800. | 8.00 | 29.02 | 22.14 | 26.15 |
| 3900. | 8.00 | 29.23 | 22.32 | 26.95 |
| 4000. | 8.00 | 29.43 | 22.49 | 27.75 |
| 4100. | 8.00 | 29.63 | 22.66 | 28.55 |
| 4200. | 8.00 | 29.82 | 22.83 | 29.35 |
| 4300. | 8.00 | 30.01 | 23.00 | 30.15 |
| 4400. | 8.00 | 30.19 | 23.16 | 30.95 |
| 4500. | 8.00 | 30.37 | 23.32 | 31.75 |
| 4600. | 8.00 | 30.55 | 23.47 | 32.55 |
| 4700. | 8.00 | 30.72 | 23.62 | 33.35 |
| 4800. | 8.00 | 30.89 | 23.77 | 34.15 |
| 4900. | 8.00 | 31.05 | 23.92 | 34.95 |
| 5000. | 8.00 | 31.22 | 24.07 | 35.75 |
| 5100. | 8.00 | 31.37 | 24.21 | 36.55 |
References
Go To: Top, Liquid 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, Liquid Phase Heat Capacity (Shomate Equation), References
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