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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Solid 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) | 298. - 1090. | 1090. - 1200. | 1200. - 2175. |
|---|---|---|---|
| A | 15.89383 | 10.16833 | 19.85000 |
| B | -2.691348 | 17.30607 | 0.000001 |
| C | 11.85832 | -8.919408 | -0.000002 |
| D | -3.935541 | 1.518880 | 6.480904×10-7 |
| E | -0.205142 | 2.136621 | -0.000001 |
| F | -195.4039 | -191.0354 | -196.3203 |
| G | 31.41898 | 21.82997 | 34.55258 |
| H | -190.0000 | -190.0000 | -190.0000 |
| Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1973 | Data last reviewed in December, 1973 | 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) |
|---|---|---|---|---|
| 298. | 13.73 | 13.02 | 13.03 | -0.00 |
| 300. | 13.77 | 13.11 | 13.03 | 0.03 |
| 400. | 15.18 | 17.28 | 13.59 | 1.48 |
| 500. | 16.20 | 20.79 | 14.69 | 3.05 |
| 600. | 17.13 | 23.82 | 15.96 | 4.72 |
| 700. | 18.05 | 26.53 | 17.28 | 6.48 |
| 800. | 18.99 | 29.00 | 18.59 | 8.33 |
| 900. | 19.95 | 31.30 | 19.88 | 10.27 |
| 1000. | 20.92 | 33.45 | 21.13 | 12.32 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1090. | 22.20 | 36.03 | 22.22 | 15.05 |
| 1100. | 22.20 | 36.23 | 22.34 | 15.28 |
| 1200. | 22.20 | 38.16 | 23.58 | 17.50 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1200. | 19.85 | 38.17 | 23.59 | 17.50 |
| 1300. | 19.85 | 39.76 | 24.77 | 19.48 |
| 1400. | 19.85 | 41.23 | 25.90 | 21.47 |
| 1500. | 19.85 | 42.60 | 26.96 | 23.45 |
| 1600. | 19.85 | 43.88 | 27.98 | 25.44 |
| 1700. | 19.85 | 45.09 | 28.95 | 27.42 |
| 1800. | 19.85 | 46.22 | 29.88 | 29.41 |
| 1900. | 19.85 | 47.29 | 30.77 | 31.39 |
| 2000. | 19.85 | 48.31 | 31.62 | 33.38 |
| 2100. | 19.85 | 49.28 | 32.44 | 35.36 |
References
Go To: Top, Solid 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, Solid Phase Heat Capacity (Shomate Equation), References
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