niobium dioxide
- Formula: NbO2
- Molecular weight: 124.9052
- IUPAC Standard InChI: InChI=1S/Nb.2O/q+4;2*-2
- IUPAC Standard InChIKey: BJDGBXPQVFSQOZ-UHFFFAOYSA-N
- CAS Registry Number: 12034-59-2
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Niobium(iv) oxide
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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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 2175. - 3000. |
|---|---|
| A | 94.14260 |
| B | -0.001923 |
| C | 0.000534 |
| D | -0.000053 |
| E | -0.001860 |
| F | -753.4750 |
| G | 178.2740 |
| H | -710.8720 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1973 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 2175. | 94.14 | 251.4 | 176.9 | 162.2 |
| 2200. | 94.14 | 252.5 | 177.7 | 164.5 |
| 2300. | 94.14 | 256.7 | 181.1 | 173.9 |
| 2400. | 94.14 | 260.7 | 184.3 | 183.3 |
| 2500. | 94.14 | 264.5 | 187.4 | 192.8 |
| 2600. | 94.14 | 268.2 | 190.5 | 202.2 |
| 2700. | 94.14 | 271.8 | 193.4 | 211.6 |
| 2800. | 94.14 | 275.2 | 196.3 | 221.0 |
| 2900. | 94.14 | 278.5 | 199.1 | 230.4 |
| 3000. | 94.14 | 281.7 | 201.8 | 239.8 |
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
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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