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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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) | 3000. - 6000. |
|---|---|
| A | 12.62973 |
| B | 1.086014 |
| C | -0.294118 |
| D | 0.025125 |
| E | -0.232687 |
| F | -52.40010 |
| G | 78.86090 |
| H | -47.79995 |
| 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) |
|---|---|---|---|---|
| 3000. | 13.89 | 94.91 | 82.87 | 36.12 |
| 3100. | 13.89 | 95.37 | 83.27 | 37.50 |
| 3200. | 13.89 | 95.81 | 83.65 | 38.89 |
| 3300. | 13.89 | 96.23 | 84.03 | 40.28 |
| 3400. | 13.89 | 96.65 | 84.39 | 41.67 |
| 3500. | 13.89 | 97.05 | 84.75 | 43.06 |
| 3600. | 13.88 | 97.44 | 85.10 | 44.45 |
| 3700. | 13.88 | 97.82 | 85.43 | 45.84 |
| 3800. | 13.87 | 98.19 | 85.76 | 47.23 |
| 3900. | 13.87 | 98.55 | 86.09 | 48.61 |
| 4000. | 13.86 | 98.90 | 86.40 | 50.00 |
| 4100. | 13.86 | 99.25 | 86.71 | 51.38 |
| 4200. | 13.85 | 99.58 | 87.02 | 52.77 |
| 4300. | 13.85 | 99.91 | 87.31 | 54.15 |
| 4400. | 13.84 | 100.2 | 87.60 | 55.54 |
| 4500. | 13.84 | 100.5 | 87.89 | 56.92 |
| 4600. | 13.84 | 100.8 | 88.16 | 58.31 |
| 4700. | 13.83 | 101.1 | 88.44 | 59.69 |
| 4800. | 13.83 | 101.4 | 88.70 | 61.07 |
| 4900. | 13.84 | 101.7 | 88.97 | 62.46 |
| 5000. | 13.84 | 102.0 | 89.22 | 63.84 |
| 5100. | 13.84 | 102.3 | 89.48 | 65.23 |
| 5200. | 13.85 | 102.5 | 89.73 | 66.61 |
| 5300. | 13.86 | 102.8 | 89.97 | 67.99 |
| 5400. | 13.87 | 103.1 | 90.21 | 69.38 |
| 5500. | 13.88 | 103.3 | 90.45 | 70.77 |
| 5600. | 13.89 | 103.6 | 90.68 | 72.16 |
| 5700. | 13.91 | 103.8 | 90.91 | 73.55 |
| 5800. | 13.93 | 104.1 | 91.13 | 74.94 |
| 5900. | 13.95 | 104.3 | 91.35 | 76.33 |
| 6000. | 13.98 | 104.5 | 91.57 | 77.73 |
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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